A a si nil ian Cistelidae. 7 9 



facies this species most resembles Tanychilus, but with much less 

 prolonged muzzle. 1). apicalis was described from a single specimen, 

 in which both mandibles bad lost their points, so that the state- 

 ment, " jaws probably one-pointed " (oberkeifer wahrschemlich 

 einspitzig) seems rather hazardous. The character chiefly relied on 

 for distinguishing this species may be merely individual (the inner 

 edge of eaeh elytron at apex widened and forming two points). 



D. sobrinus, also described from a single specimen, is stated in the 

 very brief description to have one pointed mandibles. As the only 

 other distinctions of this species from I), divers icollis are the want 

 of yellow edging to the clypeus (which I find in some specimens of 

 diver sicollis), shorter and more compressed form, very slight differ- 

 ences of sculpture and more curved tibiae, this species requires 

 further investigation. The figure given by the author of a mandible 

 of D. sobrinus is so different from any I have examined, as to sug- 

 gest the possibility that this also has been mutilated. The insect 

 described by Macleay as Metistete Pascoei is certainly congeneric 

 with D. diver sicollis, and, indeed, is very close to it as a species. 

 Macleay might well have been misled by Pascoe's scanty diagnosis of 

 metistete, with its final and erroneous clause, " rest as in Tany- 

 chilus," but the insect is actually widely separated from metistete. 

 I). Pascoei may be readily distinguished from D. diversieollis by the 

 following differences : — 



(1) Without strong sexual dimorphism. 



(2) Mandibles very clearly bifid at apex. 



(3) Prothorax longer, more Tanychilus like, with larger and 



coarser punctures on the basal half, the apical half, 

 especially near sides, nearly smooth. (A character noted 

 by Borchmann for D. sobrinus.) 

 The species of Dimorphochilus may thus be tabulated : — 



DimorphocJiilus, Borch. 



Apex of mandibles distinctly bifid Pascoei, Macl 



Apex of mandibles slig-htly grooved diversicollis, Borch 



var. (?) Uipicalis, Borch 

 Apex of mandibles, one pointed (?) hobrinus, Borch 



Homotpysis, Pasc. 



Group I. The " Carbonaria" group. — Form very convex, sexual 

 dimorphism pronounced. Size generally large (12-15 mm. long). 

 Eyes widely separated. 



1 7 Whole upper surface black 



_2 Prothorax strongly pilose carbonaria, Germ 



1 Species unknown to author, of doubtful value. 



