146 B R I T I SH B LOOD- SUCKING F L IES
Thi s book was almost ready for publication when specimens were received
f rom Mr . J . E. Collin of an apparently undescribed species of Ctdicoides. In
the attempt to determine this species it was found that the names arcuatus
Winnertz and impunctatus Goetghebuer had been misapplied in the British
Mus eum collection, and further that two distinct species, both undescribed, had
been confused in the wrongly named Mus eum series of " ivipunctatusr The
requisite corrections in nomenclature have been made in the preceding text,
and one of the new species has been described as C. delta, sp. n. ; the other two
are described and figured below.
Culicoides gr i s e sc ens sp. n.
A rather large species of the C. pidicaris group, agreeing with other
member s of this group in having the wing-markings dark (though faint) on a
pale ground, and the second radial cell largely included in a pale area, but with
the eyes of the female narrowly separated. Tho r a x more or less unmarked,
greyish. Wings without a separate dark spot in cubital fork. \A'ing-length
about 2 mm.
FIG. 62.—Cul i coides gTisesce^is sp. n. Wing of 2.
Tho r a x dark grey, in most specimens uniformly so, but in a few examples
a wedge- shaped brown ma rk is present behind each humeral pit, the point of
the wedge directed forwards . Hai r pale but not conspicuously so. L e g s
dark ; tibiae and tarsi may be lighter than femora, but the hind tibia has no
pale ring at the base, in this respect resembling that of C. delta. Wings, when
seen by reflected light, with very little yellow tinge on the pale areas, a blackish
ma rk in middle of front margin, other dark ma rkings greyish and usually
diffuse and ill-defined, in some specimens rather more restricted and definite ;
except that the ma rkings are fainter the wing shows no very obvious difference
f rom that of C. delta.
MALE HYPOPYGIUM : Tergi te of distinctive form ; processes of moderate
length and each bear ing a terminal hair, distal ma rgin between processes
strongly convex and without median emargination (thus differing from all the
other Bri t i sh species). Sternite with shallow excavation, membrane bare,
GENI TAL IA OF CULICOIDES
' 4 /
without trace of enlargement on inner face
hoit hairs less dense than in pul^car^s. Style not enlarged at tip A e d e a ^
FITETIRT T ^ R " ^ ^ ' - ^
NESS^ Nethy Bridge, i ? , vni. 13 {K^ng). Tulloch, Glen Spean, v^^i. 17, 8,?
i j f t ü t e n ) ^ ^ ^ - i - 2?
FIG. 6 3 . -Hy p o p y g i a of .ent ral vi ew: a.,b, (a, Rannoch ; b, Tulloch tip of
tergite and cerci) ; c,d, fagzneus, two specimens. ' ^
This species is very similar to, and possibly only a form of, sordzdellus
Zett. of Greenland, but the male of Zetterstedt's species bein^ unknown h i
f oTmf i r ^ r r ^ V ^ ^ T ^ L ^ ^ ^ of the Br i t i sh^ nd Gr en a ^
S e T i l a n d " in the British Mu s e um f rom West
S e eas i f r e " ^ specimens and have the
pa e areas of he wmg reduced in size so that the wing appear s <.reyish with
pale spots rather than the reverse. On the other hand three females f rom
Obozerskaya, south of Archangel (.4. D. Fraser) are in all r e s p e c tH milar t "
Culicoides f agineus sp. n.
A rather small species of the ¿7. puUcaris group, agreeing with other member s
I r k n i ; " ' ' ^^^ contaet ,^he wings wTh dark
markings on a pale ground, and the second radial cell largely enclosed t a
pale area. mg s without a separate dark spot in cubital f o r ^ as in ^
Wing-length L u t I-s mm '
I h o r a x rather light brown or buff-coloured (perhaps darker in older speei
mens ; most of those examined were rather f r e S l y e i L r g e d ) . L L all p a J : :