226 Mr. G. R. Waterhoiise's Monograph on 



which agrees exactly with this species, excepting that the hinder 

 tibiae are tipped only with black ; and as this specimen is a female, 

 and those from which the above description was taken were males, 

 the black hinder tibiae may be only a sexual character, or else it may 

 be a character liable to variation in both sexes, a point which can 

 only be determined by the examination of a number of specimens. 



Sp. 15. D. PUSILLA. 



D. viridis, pihs albis decumbentibus : capite punctatissimo ; tho- 

 race punctato, canali lato dorsali, foveisque duabus lateralibus : 

 tibiis anticis bidentatis ; tarsis cyaneis. 



Long. Corp. 2^ lin. 



In Mus. D. MacLeay. 



Descrip. The head is punctured throughout ; the thorax is nar- 

 row, and has the lateral margins produced in the middle, and form- 

 ing an angle. The dorsal channel is very broad and distinct ; the 

 lateral foveae are very large, deep towards the lateral margins of the 

 thorax, and extend to the dorsal channel. The thorax is distinctly 

 punctured ; the punctures are most thickly disposed in the dorsal 

 channel and lateral foveae. The elytra are coarsely punctured ; the 

 punctures confluent : the two elevated ridges on the disc of each 

 elytron are distinct ; the terminal segment of the abdomen is convex, 

 thickly punctured throughout, and covered with white pubescence. 



Obs. I have seen only one specimen of D. pusilla, and this is a 

 male ; it differs however in so many respects from its allies D. par- 

 vnla and D. Spencii, that I have no hesitation in describing it as a 

 distinct species. Upon comparing the three together we at once 

 perceive a considerable difference in the form, owing to the elytra 

 being longer and larger in proportion, and less convex, and the tho- 

 rax being narrower in D. pusilla than either of the other two species. 

 In D. pusilla the clypeus is nearly in the same plane with the fore 

 part of the head, whereas in D. Spencii this part is considerably re- 

 curved, and rather more deeply emarginate. In D. parvula the 

 clypeus is slightly recurved, and narrower than either of the other 

 two. The thorax of D. pusilla has a simple shallow dorsal channel, 

 whereas this part is divided by an elevated ridge in D. parvula ; 

 the lateral foveae are larger and deeper in Z)./)Msi//athanin D. Spen- 

 cii, and are connected by a shallow transverse impression with the 

 dorsal channel ; the thorax is more finely punctured in our present 

 species than either of the other two ; the punctures are less thickly 

 disposed and uniform than in D. Spencii. The anterior tarsi are 

 longer and less dilated in this species than in the two with which 

 we are comparing it. 



