5 G OEDBR—COLEOPTERx\. S E C T I O N — P E N T A M E E A . F A M I L Y — C E T O N I I D I E . S U B - F A M I L Y — C E E M A S T O C I I E I L I D E S .
(fig-. 4 0, subtus ; 4 e, lateraliter visum), parte basali multo ang-ustiori stipitem formante (fig. 4 d, mentum e capite
separatum et e p ^ t e postica visum) ; prothorax loDg-itudine latitudinem fere »quante, lateribus rotmidatis, augulis
posticis subaeutis (latitudine majori ante medium); epimera mesothoracica supra visa vertiealia; presternum
spina parva setosa ante coxas anticas armatimi ; mesosternum in ta-iangulum acutum inter coxas medias
nullo modo porrectum retro terminatiim ; pygidium rotundatum integrimi ; pedes subgraeiles, tibus anticis
extus bidentatis subtus inermibus nee tuberoulo conico iustructis ; tibiaa 4 posticiE spina brevi et calcari
longiore intus ad apicem armatas ; tarsi 5-articulati, articulo basali in pedibus anticis panilo minore (fig-. 4 / ,
apex tibiie antic® et tarsi, maris, ut videtm- ; i^g, id. foimina} spinis tibia; majoribus) ; unguibiis parvis ; abdomen m
utroque sexu, ut videtur, subtus convexum.
I have separated the insect on which this genus is proposed from the typical Cyclidii, ou account of its
small size, entirely sericeous covering, more slender legs (the anterior tibia; being destitute of the triangular
lobe on the under'or inner smfaee), and the more regularly transversely ovate form of the mentum.
SPECIES 1 (S5)—CYCLIDINUS LUGUBKIS.
PLATE XI, FIG. 4.
Totus supra obscure luteo-pulverulentus, punetis nigris varius ; prothorace vittis duabus augustis mediis,
singula vitta in medio extus dilatata, nigris ; capite et pronoto punetis parvis rotundis ; elytris supra in medio
fere planis, punetis oblongo-ovalibus parvis cicatricosis; antennis obscm-e fulvis; pedibus nigris rugosis, spiraeidis
duabus postieis conicis.
Long. corp. lin. 7 ; lat. humer. elytr. lin. 3.
Habitat; prope fliivium Amazon (Bates). In Mus. Hopeiano Oxoniie et Bates.
GENUS 25--PSILOCNEMIS.
(Bm-meister, Handb. iii. 1S42, p. 676. Cremastocheilus (pars), Scliaum.)
Cremastoeheilo proximus, corpore fere Isvi nitido; elypeus valde dilatatus prope ociilos latior; antennarum
artieulus basaUs triangularis ; maxilla; basi minus crassa ; galea falciformi apice acutissimo ; mandone crassiori
oWiqiie aeumiuato (pl.ll, fig. 4«) ; mentum maximum, caput antiee infra tegens, basi valde angustum (fig. 4«,
mentum intus, et 4 e, postice visum) ; parte antica lata planiuseula margine parum elevato, parte postica angulata
integra; et sub jugulo extensa ; prothorax lateribus rotundatis aqualibus ; tibia; antica; extus in medio fere,
mutica;, apice extus acuto (fig. 4^), et supra basin tarsornm o-artioulatorum producto ; prosternum spma obtusa
setosa ante coxas anticas armatum; mesosternum baud prominens; abdomen maris segmentis 2, 3, et 4 ventralibus
longitudinaliter inipressis.
The genus agrees with Cremastocheilus in the structure of the head and abdomen, and with Cyclidius m
the legs a t d prothorax ; but, in the poUshed surface of the body, it differs from both those groups.
SPECIES 1 (86)—PSILOGNEMIS LEUCOSTICTA,
PLATE II, FIG. 4.
Nigra, nitida : capitis margine antico panilo reflexo ; vertice inter antennas biimpresso ; pronoto elytiisque
punetis vel'striolis albis tomentoso-pilosis notatis ; prothoracis lateribus rotundatis, margine postico fere recto, ante
marginem transversim biimpresso ; elytris longitudinaliter in medio subsulcatis, costaque elevata cum lateribus
parallela, disco punetis subtriangularibus impresso.
Long. corp. liu. 6 ; lat. elytr. bas. lin. 3.
Habitat; North Carolina (?) (Zimmerman), Mexico (?).
Sra. : Psilocnemis Imcosticla. Burmeister, Hanclb. iii. p. 677, 1842.
Fsilomanis polita. Schaum, Annales Soc. Ent. France, 1844 (id. 1845, 1>- 54), P- 397 J Lam. MeUt.
p. 65.
The tropin of this genus are carefully represented by Dr. Burmeister in his ' Genera XL, Ins. No J, pi. I,
fio-s 6 7 My figures were made from a dissection of the type specimen sent to me by Dr. Sehaiim. ihe maxilke'fi.
l 11 fio-. 4«) have the galea very acute, and the tooth of the mando thickened above its apex ; the mentum
is represented as seen within the mouth in fig. 4S, shewing the position of the small square basal portion in
the middle with the palpi arising in front of its lateral anterior angles. Fig. 4» represents the mentum seen
from behind, shemngthe small square basal portion in relief, and fig. i d represents the anterior tibia and tarsus,
of which the two basal joints are concealed by the apex of the former.
GENUS 26—CREMASTOCHEILUS.
(Knoch, Neue Bcytr. 1801, p. 115.)
Corpus obscurum depressum superficie variolosa; antenna; artieulo basali magno subtrigono apiee dilatato;
clvpeus mao-nus transversus margine antico elevate; mandibula; medioeres, parte cornea externa curvata et
obtusa, apiel ipso acuto, et partem iuternam membranaecam ambiente; maxilla; basi erassie, galea ™eiuata
acuta mandone brevi aeuminato in dentem transversum aeutiim abeunte ; mentum maximum, parte basa 1
ano-usta apicali vero latissima pateriformi excavata, margine ejus postico interdnm profunde emargmato ant sub
iuXilo in proeessum corniformem retro deflexo (pi. XIV, fig. 5e, 5 / ) ; prothorax angiilis anticis et postieis ina;-
mialihus vel tuberculatis; spiracula 2 apicalia conica; prosternum in spinam parvam comprcssam ante coxas
anticas porrectum (pi. XIV, fig. 4«); mesosternum tenue muticum inter coxas medias angustissimum;
tibiie antiea; bidentata;; tarsi 5-articulati simpliees.
The species of this genus are confined to North America. They are divisible into three groups, according
to the form of the mentum.
GEOUP A Those in which the hind margin of the mentum has a very deep notch, and which appear
to be confined to the Atlantic slope as far as the Platte Biver. The species belonging to this Group may be
considered as the tj^pes of the Genus.
Giioup B. Those which have a very small notch or incision in the hind margin of the mentum.
GROUP C. Those with the hind margin of the mentum entire and pointed, and which are distributed from
the Platte Biver to the Pacific Ocean.
The followino- tabulation, by Dr. Horn, of the American species with which he was acquainted, will be
found useful in the determination of this very difiieult group. It will be seen that the insects described below,
under the names of Cr. Uexkanus and Cr. c,-enicollu (belonging to the third group), and Cr. a M s u s O,
junior (if distinct from Cr. sqummdoms), and Cr. Pm-oheronii, belonging to the second group, are omitted. I hey
are introduced in this work mainly on the authority of Dr. Schaiim, who possessed specimens of them, and
who was in an excellent position to judge of their specific rank, both from possessing the typical speeimcns
of Goi-)' and from his actual acquaintance with the American Collections made duiing a long visit to the
United States. Being unable to examine the specimens on which these additional species were founded, and
to compare them will, the more recently published descriptions of Drs. Leeonte and Horn, I have not ventured
to introduce them into this table.
Tlie first three species, Cr.planaUs, depressus, and mucius, have a short frontal carina joining the reflexed
ridge in front while the first two have the sides of the head carinate and a transverse occipital groove, and
the pygidium elevated longitudinally. The two species just cited are very decidedly ambulatorial, from the
form of their legs, which are relatively longer than any others of the genus. The anterior tibue are slender,
slightly arcuate and the teeth of the outer edge small or obsolete. The tarsi are longer than the tibia;, and
the anterior pair with the peculiar formation indicated in the table. The dorsum of the elytra is also perfectly
flat and bounded laterally by a slightly elevated border.