468 STUDIES IN AUSTRALIAN ENTOMOLOGY, Xvii., 



terior extremities of buccal fissures, pointed obliquely backwards 

 and outwards, obtuse, a setigerous puncture at apex, and one or 

 two long setse on outer side. Prothorax broader than long 

 (3"3 X 6 mm.), widest before middle, wider across base (4*8 ram.) 

 than apex (4*5 mm.); sides lightly rounded anteriorly, sinuate 

 before base; anterior angles obtuse, prominent; basal angles 

 rectangular; lateral margins wide, widely explanate towards 

 base. Elytra broader than prothorax (10*5 x 6 '8 mm.), subparallel 

 on sides, truncate at base; interstices depressed; border slightly 

 raised, and angulate at shoulders. Legs light; anterior tibia 

 wide at apex; external angle dentate, not prominent. Length 

 (with mandibles), 18*5; breadth, 6-8 mm. 



9. Differs from ^ by head smaller; front less depressed; eleva- 

 tion bounding this depression on the sides short, less defined, 

 less oblique; postocular impressions of head hardly marked; sub- 

 mentum unarmed (lower edge widely emarginate in middle, and 

 with a slight prominence near each side). Length, 15-5: breadth, 

 6*2 mm. 



Hab.—W.A.: Cue(FL W. Brown); Strelley River(H. M. Giles) 

 — N.T.: Barrow Creek (from Mr. French). 



This species is at once separable from all others by its deeply 

 cleft labrum, the enlargement of the left mandible, and the 

 strange processes of the submentum in ^. It is noticeable, 

 under a lens of high power, that there are some minute punc- 

 tures on the outer side of the mandibles, near the ante-apical 

 bend. A similar development of processes on the submentum is 

 met with in the Asiatic harpalide genus Diodes, in which the 

 outer side of the mandibles is plentifully beset with setigerous 

 punctures. The description is founded on specimens from Cue 

 (given to me by Mr. Brown). A specimen {$) from the Strelley 

 River (given to me by Mr. Giles) has the processes of the sub- 

 mentum greatly reduced in size (forming pyramidal tubercles), 

 showing that this character (as is usual with secondary sexual 

 characters) is variable. Two female specimens examined (from 

 Cue and Barrow Creek) have a puncture on the third interstice 

 of elytra above the apical declivity; in one male specimen alone is 

 this puncture present, and then only on one side. 



