1952] 
Darlington — Brachyonychus 
127 
Brachyonychus sublaevis medius n. subsp. (see below) 
Lower Siam 
(3) All discal intervals of elytra impunctate; lateral inter- 
vals 9, 8, and (sparsely) 7 punctate. 
Brachyonychus sublaevis parumpunctatus Bts. 
Tenasserim, 
part of Siam, 
Malay Pen. 
(4) Only lateral intervals 9 and outer edge of 8, and base 
of elytra, punctate. 
Brachyonychus sublaevis andersoni Bts. Mergui Arch. 
(Elphinstone Is.) 
etc. 
(5) Only lateral intervals 9 and outer edge of 8 punctate. 
Brachyonychus sublaevis laevipennis Chd. Part of Siam, 
Cochin-Ohina 
References to the original descriptions of the named 
forms will be found in Andrewes’ Catalogue of Indian 
(Oriental) Carabidae (Part 18 of the Catalogue of Indian 
Insects, published by the Government of India, Calcutta, 
1930). 
It will be seen that, generally speaking, individuals with 
the most extensive elytral punctation (typical sublaevis 
etc.) occur in Cochin-China (there are 8 examples of this 
form in the U.S.N.M. material) ; more northern individuals 
from Indo-China ( perraudierei Bts.) and Laos ( puncti - 
pennis Gestro) are fully punctate too, and it remains to be 
seen whether these two names are recognizable on other 
characters; and more western specimens, from Siam, Tenas- 
serim, the Mergui Archipelago, and the Malay Penninsula, 
have the elytral punctation either sparse at middle of disc 
or absent in a smaller or larger discal area. The only 
locality listed above which is not consistent with this gen- 
eral distribution is the “Cochin-China” record of laevi- 
pennis . However, the variation in punctation apparently 
does not form a simple cline; the exact distribution of the 
different forms is uncertain because of the indefiniteness 
of the older type localities, but the distribution of different 
populations appears to be somewhat irregular. Only more 
material will show just how many forms are really recog- 
