3 2 . I d o t e . a b i c u s p i d a . n . s .
/ . eorpore elongato-mato, caudâ apice bidentatâ, antatms tsrliam corporis parlein (rqnantibui.
Long. eorp. lin. 14. Color, cinereus rubro maculatus.
T h is sp e c ie s a p p e r ta in s fo th e s e c tio n w h ich L a tr e ille h a s c h a r a c te r is e d by th e antenna e x c e e d ing
in len g th th e h e ad a n d first tw o s egm e n ts o f th e b o d y . {Nouv. D ie t. d 'H is t. N a t. X V I . p. 104.)
I t is re a d ily d is tin g u is h e d from tlie sp e c ie s th e re rn comprehe tHled, by th e tr ia n g u la r form o f th e ta il,
c o n s is tin g o f a s in g le segm en t, sm o o th a n d c o n v e x ab o v e , a n d n o tch ed a t th e a p e x . T h e body c o n -
s is ts o f se v e n s egm e n ts , th e m a rg in s o f which a re s lig h tly ro u n d e d off; th e m id d le o f e a ch segm en t is
m o re e le v a te d th a n th e side s, g iv in g th e a p p e a r a n c e o f tw o la te r a l lo n g itu d in a l lin e s, as in th e tiilo -
b ite s . T h e re is a n in d ic a tio n o f a d iv isio n o f th e c a u d a l s e gm e n t by two la te r a l in c isio n s. T h e h e ad
is tra n sv e rs e ly q u a d r a te ; th o ey e s a re c o n v e x , a n d s itu a te d in th e a n g le o f th e h e a d a n d first segm en t.
T h e f ro n t is slig h tly p ro d u c e d , a n d L a s a sh a llow in c isu re a n te rio rly . T h e e x te rn a l antenna a re
fiv e -a rtic u la te , th e la s t jo in t s e ta c e o u s ; th e in te rn a l a n lem ta a re fo u r - a r tic u la te , a n d r e a c h to th e
th i r d jo in t o f th e e x te rn a l. T h e f e e t a rc s im p le , a n d c ilia te b e n e a th . T h e instrumenta cibaria a g re e
with th e d e ta ile d d e s c rip tio n g iv en b y L a tre ille , {loco citato, p. 99,) b u t th e m an d ib le s have b la ck
h o rn y e x trem itie s . T h e p o rta l lam in a which c o v e r th e bra rrcb ia l a n d o v a ria n ap p e n d a g e s , o p e n and
c lo s e as in th e p re c e d in g spe c ie s, a n d re a ch to th e end o f th e ta il.
I t is a n a tiv e o f th e A rc tic S e a s .
P l a t e X X V il. F i g . 6 . I d o t e a b i c u s p i d .a . ' !l