1873.] 51 



truncated in front, the angles rounded, concave on each side within 

 the angle, the suture strongly marked at each side, indistinct in the 

 middle ; eyes very narrow ; outer joints of antennae wanting, basal 

 joints almost as in Njjctozoilus, the 3rd joint being relatively shorter ; 

 scutellum as in Onosterrhus, but having the triangulate depression on 

 the elytra behind it, as in NyctozoiJus ; elytra oblong-oval, very convex, 

 abruptly declivous behind, shoulders broadly rounded, sides narrowly 

 margined and reflexed ; legs rather stout, compressed ; sterna, &c., as 

 in JVycfozoilus, except that the meaosternum is more deeply hollowed 

 out in front, and the intercoxal process is relatively narrower ; body 

 oblong, sub-parallel, very convex, elytra closely and coarsely punctured. 



^THALIDES PUKCTIPElsTSriS, Sp. 11. 



Black, slightly shining ; head and prothoi-ax finely and not closely pimctured, 

 the interstices minutely punctiilate ; disc of prothorax unequal by numerous irregular, 

 more or less transverse, impressions, and an obscure oblong impression at each side 

 near the margin ; scutellum smooth, convex on the disc, ridged along the base ; 

 elytra rather coarsely, closely, and irregularly punctured, most strongly so on the 

 middle, more finely at the sides, obsoletely so at apex ; interstices convex, reticulate ; 

 a distinct trace of three longitudinal costae on each elytron ; under-side and legs deep 

 black, moderately shining, finely (in parts minutely) and not closely punctured, 

 the interstices (especially on the abdomen) miniitely punctulate ; flanks of prothorax 

 (except the lateral margins) longitudinally rugose ; abdomen finely, longitudinally — 

 reticulately at the sides — strigose ; prosternal process strongly margined at each side, 

 the end produced in the middle and broadly rounded. 



Length, 7i lin. ; width of elytra across the middle, 4J lin. 



Hah. : Western Australia ; one example. 



OlfOSTEREHUS PUNCTULATUS, Sp. n. 



Intermediate in form between O. marginicolUs and opacus ; black, moderately 

 shining ; head finely punctured, antennary orbits a little reflexed, not at all thickened 

 at the edges or channelled within ; epistoma broadly truncated in front, the suture 

 strongly marked, a depression at each side within the angle ; prothorax strongly 

 transverse, very distinctly (though minutely) punctulate, sides moderately, regularly, 

 and not at all sinuously, rounded, a little more contracted anteriorly than posteriorly, 

 the edges uniformly thickened, not distinctly channelled within ; apex broadly 

 arcuate-emarginate, front angles prominent, acute, directed forwards ; base broadly 

 truncated, a short sinus at each side in front of the angle ; hind angles directed 

 somewhat backwardly ; scutellum less strongly transverse than in the other species, 

 punctured ; elytra oblong-oval, very conrcx, less abruptly declivous behind than in 

 the other species, more shining than the prothorax, distinctly and uniformly — though 

 minutely — punctured, and more markedly alutaceous (or reticulately streaked) than 

 in any of the other species; lateral margins more strongly reflexed than usual, and 

 entirely visible (from base to apex) when viewed from above ; transverse gular furrow 



