284 



the ridge crowned with two subtriangular tubercles; front 

 face of clypeus subvertical, with crowded and fairly large 

 punctures, elsewhere sparsely or not at all punctate ; canthi 

 rather deeply concave; outlines of mandibles somewhat 

 sinuous. Prothorax obliquely irregularly flattened and 

 highly polished on apical half, at summit of slope with four 

 remnants of a transverse ridge; with round distinct punctures 

 irregularly scattered about, but towards the sides becoming 

 subobsolete. Scutellum impunctate. Elytra conspicuously 

 striated, with rather feeble punctures in the striae, thirteenth 

 and fourteenth irregularly conjoined towards the base. Front 

 tibiae with five teeth, hind ones with two transverse carinae. 

 Length, 14-16 mm. 



9 . Head with irons concave and frontal elevation 

 absent, clypeal elevation with three notches, lateral areaemuch 

 smaller than usual. Prothorax along middle almost evenly 

 rounded from base to apex, except for a carina traversing 

 the apical fourth, in front of same to head impunctate, except 

 at the margin ; punctures larger and more numerous than on 

 male. 



Hah. — Western Australia: Beverley (F. H. du Boulay). 

 Type, I. 221. 



The male differs from the male of tan nix in having the 

 horns between the eyes much longer than the ones in front, 

 instead of much shorter, the front ones are also conjoined 

 instead of widely separated, the apex of the prothorax is 

 also not bifoveate. The horns at the base vary in length 

 and direction, on some specimens, except for a slight curva- 

 ture, they are almost erect, so that the space between their 

 tips is about the same as that between their outer bases; on 

 other specimens, however, they diverge so much that their 

 tips are twice as distant as their outer bases. The sublateral 

 foveae of the prothorax, although not very deep, are laterally 

 extended, and are bounded in front and behind by distinct 

 ridges. Blackburn considered the jnnctioning or otherwise 

 of the thirteenth and fourteenth elytral striae near the base 

 to be of specific importance, but on several specimens of this 

 species they are irregularly conjoined on one side and free 

 '(although close together) on the other. 



BOLBOCERAS CONTEXTUM, 11. Sp. 



PI. xxxiii., figs. 54 and 55. 



c? . Castaneous, some projecting parts black. In parts 

 densely pilose. 



Head irregularly excavated and with scattered punctures: 

 a transverse ridge between eyes, ending near each eye in an 

 acute conical tubercle, each tubercle with a thin longitudinal 

 ridge extending backwards to the base and frontwards to the 



