6Y H. J. CARTER. 535 



Queensland. Pascoe gives Melbourne as the locality, but I have 

 not seen any specimens taken south of Sydney. It may be noted 

 that all the species of Omolipus are subject to great variation in 

 size. 



There seems to me little doubt as to the above names being 

 synonymous. I have seen a large number of examples from 

 various parts of West Australia which present the slight colour- 

 variation on which Gebien founded his 0. chalyheus. Pascoe 

 says of 0. cyaneiis " legs .... reddish," while in 0. chalyheus 

 they are black In most of the blue species, there is a tendency 

 to redness on the underside and appendages, especially in slightly 

 immature examples. Gebien seems not to know 0. oblongus 

 Bates, and states, in his tabulation of the species, that the colour 

 is dark green. Bates says in the description "dark green with a 

 chalybeate tinge." I have cotypes of this, which are quite blue. 

 My specimens of 0. cyan.eus Pasc, were compared with type. 

 The differences noted by Gebien between 0. chalyheus and 0. 

 affinis are exactly the differences which exist between 0. cyaneus 

 Pasc, and 0. ohlongus Bates, the apex of prosternum bent up- 

 wards in 0. cyaneus^ downwards in 0. ohlongus. As Gebien's 

 table is incomplete, I append a tabulation of the genus. 



Group i. Species with short mesosteriuiin, form ovate. 

 1(7) Colour black. 

 2(4) Surface nitid. 



3. Elytra striate-punctate, seriate punctures large sociua Pasc. 



4. Elytra seriate-punctate, seriate punctures very small l(BviH Pasc. 



5(7) Surface ^especially pronotum) subopaque. 



6. Size large, seriate punctures.ir regular in size and distance... ro/Tws Pasc. ; 



grrawt/i.s Mac] . 



7. Size small, seriate punctures round and regular..., gyiesioides Pasc. 



8. Pronotum violet, elytra blue himetallicus, n.sp. 



Group ii. Species with long mesosternum, form elongate. 



9. Whole surface black parvus Ba.ies. 



10(13) Upper surface blue. 



11, Elytra clearly striate-punctate, seriate punctures small., angustus, n.sp. 



12. Elytra substriate-punctate, intervals convex, seriate punctures 



large and round cyaneus Pasc. ; chalyheus Geb. 



