454 A SECOND NOTE ON THE CARENIDES, 



to offer a short definition of this genus, giving characters, a 

 combination of which seems to be all that separates the species 

 belonging to Eurysca2:)hivs from all other divisions of the Garenides. 



Form generally very broad and heavy ; colour entirely black ; 

 upper surface smooth ; sub-orbital channel to receive antennae 

 single ; lower edge of orbit overhanging the sub-orbital channel 

 and prominent (usually projecting) in front ; a deep oblique 

 groove defining the genae behind and dividing them from the 

 submentum and guise ; anterior tibise bidentate. 



The species of this genus are in some confusion owing to 

 the vagueness of de Castelnau's descriptions ; this confusion 

 has been further increased by the difference in shape between 

 the sexes, resulting in the $ and ^ of certain species having been 

 described as different species — e.g., E. hipunctatus, Macl., = $ 

 of E. obesus, Macl. Having seen some of de Castelnau's types 

 in the Howitt Collection at the Melbourne University, and 

 having collected specimens, both male and female, of E. obesus, 

 Macl., I am enabled to throw a little light on some of these 

 points. In the genus Euryscaphus the (J usually has the elytra 

 more emarginate at the base, and broader and more strongly 

 rounded on the sides than the 9, so that it becomes necessary in 

 describing a species of this genus to determine and record the sex 

 of the type. It may be worth noting here that I consider, from 

 the descriptions, Mr. Blackburn's three species E. tatei, E. 

 chaudoiri, and E. sidcicollis to be founded on female specimens. 



The following synoptic list of the species without discoidal 

 punctures on the elytra now in my possession is offered as a con- 

 tribution towards settling a few of the difficulties in the way of 

 determining at least some of the species of the genus. The table 

 is unavoidably founded on female specimens, no male specimen of 

 four of the species being available. 



a. Posterior angles of prothorax rounded, the base rounded 

 between them. 

 b. Reflexed border of elytra ending at humeral angle and 

 forming a thick upturned humeral projection. 



