86 H. I. Carter: 



10 17 All elytral intervals convex 



11 16 Whole surface nit id 



12 14 Pronotum densely punctate 



13 Seriate punctures large, intervals subcarinafce subsvlcata, MacT 



14 Seriate punctures smaller, intervals subconvex angustata, Mad 



15 Pronotum sparsalj punctate, seriate punctures very large 



laticollis, Macl 



16 Pronotum smooth nitidior, n.sp. 



17 Head and pronotum opaque rvgicollis, n.sp. 



18 2d Appendages red 



19 Size large (22 mm. long), posterior angles of prothorax obtuse 



grand is, Borch 



20 Size smaller (13-15 mm. long), posterior angles of prothorax 



acute planata, n.ap. 



21 Femora yellow, tibiae black femorata, n.sp. 



22 Elytra with alternate intervals redl vittata, Pasc 



23 Colour pale yellow pallida, n.sp.. 



Ilyhrenio is, I consider, generically distinct from Homotrysis, 

 though it must be admitted that the dividing line between them is 

 not very clearly defined. In so large a group, however, as that 

 formed by insects described under Allecula, Homotrysis and 

 Hybrenia, it is convenient to seize on any characters that facilitate 

 classification. The genus Hybrenia as tabulated above contains the 

 largest insects of the Australian Cistelidae, and have the following 

 combinations of characters : — Eyes, large and approximate (espe- 

 cially so in the 3 prothorax closely applied to the elytra and 

 generally but slightly narrower than it ; form generally less convex 

 (more flattened) than in Homotrysis. 



Synonymy. — //. (Allecnla) pimeloides, Hope = //. princeps, Blackb. 

 //. vittata, Pasc. = /7. insularis, Pacs. =//. subvittata^ 

 Macl. 



I have pointed out Blackburn's mistaken determination of //. 

 pimeloides as a Metistete (see Metistete below). A specimen com- 

 pared with Hope's type has been sent me from the Brit. Mus. As. 

 Blackburn noticed Hope's insect is larger than any specimens of .1/. 

 omophloides, Hope, which he (Blackburn) described at length (Proc. 

 Linn. Soc, N.S.W., 1888, p. 14-56). under the name pimeloides. I 

 have u specimen of //. pimeloides, Hope, from Angledool (Western 

 New South Wales). 



Specimens of //. vittata, Pasc, and of H. insularis, Pasc, have 

 also been sent for examination. Pascoe carelessly overlooked the 



1 //. vittata, riir. eoncolor, n. var., may be distinguished from the other black species bj the 

 following combinations: Appendages black, eyes of £ subcontiguous, pronotum and elytra in- 

 tervals densely punctate, elytra striate, intervals quite flat, seriate and interstitial punctures com- 

 mingled and of equal size. 



