518 REVISION OP THE GENERA COLPOCHILA, ETC. 



and the breast at most moderately hirsute, — the latter having the 

 hind tibiae strongly dilated at the apex and the breast usually 

 densely lanuginous. The first above named three genera of this 

 gi'oup form the 1st section and the other four the second. But in 

 this second section it appears to me that Haplonycha must be 

 suppressed as not really distinct from Colpochila, and therefore 

 the section will consist of the following genera, as tabulated, — 

 A. Elytra geminate-striate. 



B. Labrum arched above, front tibise with 3 teeth 



externally Colpochila. 



BB. Labrum flat above, front tibite without a 



trace of more than 2 teeth externally Pachygastra. 



AA. Elytra evenly (or nearly so) punctulate-striate Colohostoma. 



I am not at this moment pre})ared to furnish a tabulation of 

 the genera forming the section with hind tibipe scarcely dilated at 

 the apex, because I think at least one new generic name will be 

 required. Sericesthis (the only one of them concerned in this 

 part of the present memoir) may be distinguished f rom^ the others 

 by its elytra being geminate-striate. I hope to deal with these 

 genera in the next part. 



Saj)lonycha being regarded as not really distinct from Colpo- 

 chila, twenty species are enumerated in Masters' Catalogue. The 

 descriptions of two of these are insufficient for identification 

 (pinguis, Macl., and ciliata, Boisd.), three I should eliminate from 

 the genus on account of their having genuinely punctulate-striate 

 elytra (o6sc^tr^co?•ms, ^\&nch., striatella, Blanch., and rit^osa, Burm.), 

 while Astrolabei, Boisd., having its prothorax "covered with long 

 adpressed hairs " is very likely to be a member of some other 

 genus (indeed it might well be Trichelasmus pilicollis, Slip.), and 

 Tasmanica, Germ., I have already pointed out (Trans. Roy. Soc. 

 S.A., 1887, p. 206) cannot be attributed to this genus. 



Since the publication of Masters' Catalogue Sir W. Macleay has 

 described Colpochila testaceipefinis. It appears moreover so 

 extremely probable (as noted below) that Melolontha obesa, Boisd., 

 is not identical with Haplonycha obesa, Burm., that I feel obliged 

 to treat them as two species. Thus adjusted the genus contains 



