REVISION OF THE NYCTOZOILIDES. 151 
shows an irregular, uneven, rugose surface, with feeble, sub- 
obsolete costae). Abdomen finely punctate and strigose, presternum 
punctate with a short red hair produced from each puncture, its 
process sulcata in the middle, raised at sides, deflexed and bluntly 
rounded at apex. Coxae and legs punctate, epipleurae smooth, 
tooth of submentum small, fore tibia? slightly curved, other tibiae 
straight, posterior basal tarsi as long as the rest combined. 
Dimensions'. 19-22 x 10-13 mm. 
Habitat : Coonamble and Walgett, New South Wales. 
Six specimens are under examination — from the Agricultural 
Department (collected by Mr. F'roggatt), the Macleay Museum 
(through the courtesy of Mr. Masters), and the author's collection. 
Two are certainly male, larger than the presumed females, and 
have the basal joints of their fore tarsi enlarged, otherwise, except 
by my examination of the sexual organs, there are no pronounced 
sexual characters. It is differentiated from all other species by its 
combination of large size, squamosa clothing, the scarcely evident 
tooth of submentum, and the absence of a defined border to the 
pronotum, the wide margins of which are punctured like the rest 
of the unclothed surface. More elongate than 0. impunctatus, 
Ha.ag-Rut., or 0. rotundatus, Blackb., with the apical declivity 
steeper. There is considerable variation in size, convexity, and 
even in the anterior angles of prothorax, which (seen from behind) 
appear acute, but in general form an angle of about 100 deg. In 
the small tooth of submentum and other respects this species shows 
a, divergence towards jffithalides. 
ONOSTERRHXJS bos n. sp. 
Mas. : Widely ovate, convex, whole surface coal-black, nitid, 
palpi and apical joints of antennae piceous, apex of tibiae and 
tarsi beneath clothed with reddish tomentum. Head — Epistoma 
evenly rounded in front, deeply and widely impressed at sides, 
forming a wide angle with canthus, the latter straight at the 
sides, produced and slightly raised in front, forming an evident 
tooth ; forehead separated from epistoma by sinuate ridge, the 
whole upper surface of head closely and not very finely punctate 
(punctures stronger on epistoma), eyes small, transverse; 
antennae not reaching base of prothorax, third joint as long as the 
