MJÖBERG, CETONIDiE, RUTELID.5:, PASSALIDJE ETC. 3 



part of the head behind the eyes is dark; prothorax has a 

 large black blotch and a small black lateral spöt on each side 

 between its margin and the blotch ; the main colour yellowish 

 stramineous on prothorax as well as on elytra, only the sut- 

 ure is black, and scutellum black with a V-shaped yellow 

 mark. The whole ventral surface is rufous, with exception 

 of the sides of prothorax which are black; the pygidium is 

 yellow with a transversal dark stripe at the base and two 

 reddish spöts in the middle. 



10. Cacochroa obscura Blackb. (Figs. 1 and 2). — This 

 very characteristic species was described by Blackburn from 

 a single abraded specimen from the Northern Territory. Since 

 then it does not seem to have been found again. 



Blackburn's description is good, but owing to the dam- 

 aged state of his specimens, he was not able to 

 describe the markings. The parts of elytra lying 

 between the humeral corner and the posthumeral 

 contraction do not show any transverse wrink- 

 les but are finely punctured. The scutellum can 

 hardly by called »subbifid» at the apex, but there 

 is a distinctly depressed longitudinal groove run- 

 ning towards the apex, where it gradually deep- 



ens. The pro- Fig.i. Shapeof 

 sternal process is ^^^y ^^ ^^^°" 



, . - . , chroa obscura 



very solid; it be- Blackb. 

 gins in a slightly 

 downward direction but con- 

 tinues slightly turned up. Con- 

 cerning the ventral segments 

 Blackburn writes: »segments 

 1 — 4 bear on either side a 

 closely and finely punctured 

 opaque space (very likely to- 

 mentose in a fresh specimen) 

 which is subquadrate on seg- 

 ment 1 and triangulär on the 

 rest; there is a similar sculp- 

 ture on either side of the pyg- 

 idium». On fresh specimens 

 (Fig. 2) these spaces are snow- 



Fig. 2. Hindleg, pygidium and tips 

 of elytra of Cacochroa obscura Blackb. 



