46 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



Percolestus) are without a puncture in the scrobe of the mandibles.* 

 This feature also appears to be wanting in the New Zealand 

 forms. 



In the present paper I take the genus Promecoderus first, 

 because I have already treated of it ; the other genera I take in 

 what seems to me the order of their affinity as leading from 

 Promecoderus. 



Promecoderus castelnaui, n.sp. 



(J. Shining black (sometimes with a bronzy tint on elytra), legs 

 black, antennae and palpi piceous black. Head large, smooth ; 

 frontal impressions broad, shallow ; clypeal suture hardly marked ; 

 vertex lightly transversely impressed behind ; eyes not very 

 prominent, inclosed behind ; post-ocular prominences small. PrO' 

 thorax cordate, about as broad as long (4 x 4mm.), convex, very 

 slightly declivous behind ; sides rounded, not dilatate, shortly 

 narrowed behind ; marginal border narrow, hardly sinuate on the 

 sides before the base, not crossing the middle of the base; basal 

 angles sharply defined, but hardly right angles ; median line 

 distinct. Elytra oval (8 x 4|mm.), convex, lightly rounded on 

 sides, declivous to peduncle behind the scutellum, striate ; the 

 dosal strife distinct, none on the sides, first four distinct, but only 

 the 1st reaching the apex. Last four ventral segments with a 

 round fovea on each side. In ^ the four basal joints of anterior 

 tarsi dilatate and spongiose below, and with two basal joints of 

 middle tarsi spongiose below ; last joint of tarsi narrow, not 

 flattened. 



Length, (J 14, 9 16 ; breadth, $ 4^, 9 5 mm. 



* I would note that the form of the anterior margin of the prosternum 

 may prove of value in dividing the Australian Bkoscini. It is edged with 

 a continuous border in Promecoderus (all species), Cerotalis (all species), 

 Adotela (4 species which I have examined), and Gnathoxys (I have only 

 been able to examine a single example of Gn. tessellatus, Mael.). In 

 Eurylychnus the border is entire in E. oUiffi, Bates, while E. hlagravii, 

 (]asteln., and E. victorke, SI., have only obsolete ti-aces of it at each side. 

 There is no border to the anterior margin of the prosternum in Percosoma, 

 Lychims, and Percolestus. 



