414 Journal of the Asiatic Society of Bengal. [November, 1914. 



It is unfortunate that so little is known about the Burmese 

 Ischnocoleae. Two species have been described, and both have 

 been doubtfully referred to the genus I schnoc.olus—a. genus that 

 should probably be confined to species from the Mediterranean 

 and Ethiopian Regions as pointed out by Simon (Nat. Hist. Ar. 

 II, p. 925). These two species are the only Ischnocoleae, apart 

 from those found in the Indian Peninsula, that have yet been 

 recorded from the Oriental Region. But there is in the Indian 

 Museum collection an immature specimen from the Darjeel- 

 mg District which must also, I think, be referred to this 



group 



The occurrence of these three species of Ischnocoleae 

 in the Oriental Region north and east of the Gangetic plain 

 seems to indicate that such primitive forms once inhabited the 

 whole of the transgangetic area, but have now, with these 



options 



descendants which compose the Selenocosmieae and perhaps 

 also the Ornithoctoneae. The possibility, therefore, suggests 

 itself that they may be more closely related to the less special- 

 ized forms of Selenocosmieae than to the Indian Ischnocoleae, 

 in spite of the presence of rudimentary stridulating organs in 



the former. 



In addition to its characteristic stridulating organs, the 

 Selenocosmfeae are distinguished from all other groups of 

 Aviculariinae found in the Oriental Region by a character 

 which has not hitherto received as much notice as it seems 

 to deserve. I refer to the somewhat fine and extremely close 

 granulation of the anterior part of the labium, which is 

 strikingly different in appearance from the coarser and sparser 

 denticulation of this surface found in the other groups. 



Ut the three transgangetic Aviculariinae in which no 

 stridulating organ occurs, one, « Ischnocolus" brevipes, appears 

 from Thorell s description (1896, pp. 170-173) to possess this char- 

 acter ; and it is further separated from all Indian Ischnocoleae 

 except some of the higher forms, by the reduced armature of 

 its legs and by the absence of the tibial apophysis of the front 

 legs of the male. When a species shows affinities with a 



oKi Tfl M- 1S ormousl y ^st to keep it with the former if suit- 

 able definitions can be framed. This can be done in the pre- 

 sent instance by basing the definition of the Selenocosmieae 



SUr? " tructure of the labium instead of on that of the 

 stnd ulatmg organ . • < Ischm>colus ' • brevipes may then be referred 

 to the genus NeocUlobrochys by a slight widening of the limits 

 or this genus ; or a new genus may be established for it. Since 



unnecessary- 



able, I prefer the former course. 



tincrt.L i ^ m z Muing transgangetic forms without stridula- 

 ting organs (« 1 schnocolua » ornatus, Thorell, and the specimen 



