NOTES ON BRACHYONYCHUS CHD. 
(COLEOPTERA, CARABIDAE, PANAGAEINI) 1 
By P. J. Darlington, Jr. 
Museum of Comparative Zoology 
Brachyonychus is a genus of large and striking pana- 
gaeine Carabidae, distinguished from the better-known 
Craspedophorus by the form of the tarsi (4th segment 
more deeply emarginate and 5th shorter in Brachyonychus) 
and confined to the Indo-Chinese Subregion of the Oriental 
Region. The genus is rare in collections. It was therefore 
a pleasant surprise to find a series of 48 unstudied speci- 
mens, from several localities, in the collection of the United 
States National Museum. These specimens, with a single 
one previously in the Museum of Comparative Zoology, 
justify the following notes. 
Previously described Brachyonychus differ very little 
among themselves except in one character : the extent of 
punctation of the elytral intervals. The latter vary from 
entirely punctate (and pubescent) to nearly impunctate 
(and glabrous) with only the 9th and the outer edges of 
the 8th intervals punctate at the sides of the elytra. These 
differences and other slight ones chiefly of form and mark- 
ings have been treated as specific characters in the past, 
but the series before me suggests that the elytral puncta- 
tion and other characters, though fairly constant in any 
one locality, vary geographically in such a way as to sug- 
gest that there is only one real species of Brachyonychus 
with several geographical subspecies, as follows. 
(1) Elytral intervals all punctate (but 1st and 2nd ones 
sometimes less densely so) . 
Brachyonychus sublaevis sublaevis Chd. Cochin-China 
( humeratus Chd.) & Cambodia 
sublaevis perraudierei Bts. Indo-China 
(Pnomh Pen.) 
sublaevis punctipennis Gestro Laos 
(2) Elytra with a small discal area impunctate, including 
1st. and 2nd. intervals near middle of elytral length. 
1 Published with a grant from the Museum of Comparative Zoology 
at Harvard College. 
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