46 Mr. F. P. Pascoe on new Genera and Species of 



but are distinguished by several small but well-marked points 

 of difference. They seem to lie between P. Walkerii and P. 

 silplioides^ not so broad as the first nor so narrow as the last, 

 and all moderately convex. Two of these species have the 

 sutural margin raised ; one (P. laticollis) has the expanded 

 margins of the elytra rather broad, the broadest part in the 

 middle ; the other (P. he])aticus) has them much narrower, 

 very slightly contracted behind the shoulders, the rest to be- 

 yond the middle of nearly equal breadth ; the third (P. dispar) 

 aifects two forms, apparently depending upon sex, the male 

 being elliptic, the female obovate ; in this the sutural margin 

 is without any elevation. 



PterohelcBUS laticollis. 



P. fuscus, nitidus, marginibus dilutioribus ; ocuhs approximatis ; 

 prothorace elytris latiore, his postice gradatim angustioi-ibiis. 



Hob. Melbourne. 



Dark glossy brown, the expanded margins of the elytra and 

 prothorax considerably paler ; head rather narrow behind the 

 antennary ridges, concave between them ; the eyes rather large 

 and approximate ; clypeus very convex, except at its anterior 

 angles, its suture indistinct ; prothorax short, broader than the 

 elytra at its base, minutely punctured, the margins broad and 

 only very slightly reflected, the basal fove^ strongly impressed; 

 scutellum curvilinearly triangular ; elytra gradually and rather 

 rapidly narrowing from the base, seriate-punctate, the alternate 

 intervals of the rows forming slightly elevated lines, the su- 

 ture strongly elevated from below the scutellar striola, the 

 punctures rather small, the expanded margins, owing to a 

 contraction of the sides of the disk, broadest at the middle, 

 behind very distinctly reflected; body beneath and femora 

 very glossy chestnut-brown ; antenna, tibi^, tarsi, and epi- 

 pleurse of the elytra reddish ferruginous. Length 10 lines. 



Pterohelceus hepaticus. 



P. fuscus (aliquando rufo-brunueus), subnitidus, marginibus dilu- 

 tioribus ; oculis distantibus ; prothorace elytris baud latiore, his 

 postice gradatim angustioribus. 



Hah. Melbourne. 



Dark brown (or sometimes light reddish brown), paler at 

 the margins, less glossy than the last; head rather narrow 

 behind the antennary ridges ; the clypeus very convex, its su- 

 ture above indistinct, but forming a well-marked groove on 



