530 kotes on Cestrinus and allied genera 



•.; 



certain differences in sculpture, e.g., the thorax is closely set 

 with large pits, each of which has a small setigerous tubercle 

 near its anterior edge, leaving as it were a raised network be- 

 tween them. In I. opatroides this raised network is broader, 

 more even in elevation, and its surface is minutely areolated; in 



0. piceitarsis it is narrower, i.e., the pits are placed closer to- 

 gether, rather uneven, or lumpy, in elevation, and the surface 

 nitid, scarcely visibly areolated. The elytral interstices of 



1. opatroides are also a little more sharply granulate. These 

 differences I do not believe to be of specific value, as, though 

 sufficiently well defined in the two types, they occur in varying 

 degree in specimens from widely different localities. Both of 

 them I believe to be merely forms of C. trivialis Er., a common 

 and variable species ranging from Queensland to South Aus- 

 tralia. The type of I. opatroides is marked West Australia. 



C. angustior Blackbn. is very similar to C. opatroides, but has 

 the thorax narrower, with straighter sides. The raised network 

 of the thorax is broad and even, the pits even wider apart than 

 in opatroides, but the spaces between them are not or scarcely 

 visibly areolated. This also I believe to be merely a form of 

 C. trivialis. 



"Apatelus" squamosus Mael. has been stated by Carter to be 

 the same species. 



C. championi Blackb. and C. eremicola Blackb. present cer- 

 tain points of difference analogous to those between the t3 T pes of 

 I. opatroides Hope and 0. piceitarsis Hope. Unfortunately 

 there are only a few other specimens in the collection, two from 

 Western Australia and one labelled C. trivialis Er. from Tas- 

 mania, all of which more closely approximate to C. eremicola 

 than to C. championi. I am inclined to think that these species 

 also are not really distinct, and they may even prove to be merely 

 huge specimens of C. trivialis. C. sietzi Blackb. is evidently 

 closely allied; the type should be in the S. Australian Museum. 



C. aversus Pasc. and G. posticus Blackb. (the latter a purely 

 individual malformation) are both abraded specimens of C 

 punctatissimus Pasc. In spite of page priority in favour of 

 aversus the name punctatissimus should be retained for the 

 species . 



Whether C. minor Blackb., the type of which remains unique 

 in the British Museum Collection, is really distinct from C. 

 punctatissimus is, I think, very doubtful. 



