283 



each opening out to the front angle, but the two separated 

 by a wide ridge, the ridge with two short, wide horns over- 

 hanging it, behind these a rather large fovea, a rather short 

 subconical tubercle towards each side in line with the median 

 ones; sublateral foveae irregular; sides with dense punctures, 

 with small punctures and with rather large and fairly deep- 

 ones irregularly scattered about.- Scutellum with small 

 punctures. Elytra striate-puiietate, thirteenth and four- 

 teenth rows close together towards base, but not conjoined. 

 Front tibiae with five teeth, hind ones with two transverse 

 carinae, between the subapical one and the base a row of 

 small tubercles on each side. Length, 16-18 mm. 



9 . Head with two small tubercles on frontal elevation,, 

 carinae of clypeus strong, the frontal margin raised into an 

 obtuse tubercle above each antenna. Prothorax with two 

 small shallow marginal foveae at apex, the space immediately 

 behind a line connecting same, smooth, almost vertical, and 

 crowned by a somewhat curved carina, the larger puncture® 

 more numerous than on male, continued across the middle, 

 and the middle ones connected by irregular rows with the 

 m a rgin a 1 fovea e . 



Hah. — North-western Australia: Fortescue River (W.. 

 D. Dodd). Type, I. 3700. Marble Bar (Western Aus- 

 tralian Museum). Co-type, 1914 — 831; South Australia 

 (National Museum). 



Allied to armigerum, but male with median horn of 

 head semi-double, the median ones of prothorax also semi- 

 double, closer together, with a deep fovea behind them, and 

 a deep one on each side in front; the female, in general 

 appearance, is close to the female of tena.r, with which it 

 would be associated in Blackburn's table, but differs in having 

 the outer edge of each canthus on a level with the upper 

 edge of the eye, not below it ; there are also other slight 

 differences. The elevated parts of the head and the tibial 

 teeth are black. The prothorax is entirely without small 

 foveae on the front margin ; the two frontal foveae of the 

 male are large, but so placed that when the prothorax is 

 viewed from slightly behind they are quite invisible, each is 

 of a size almost to contain the head if the canthi and tubercles 

 were removed from same ; the median fovea is much smaller 

 although very conspicuous. 



BOLBOCERAS HOPLOCEPHALTJM, 11. Sp. 

 PI. xxxiii., figs. 57 to 59. 

 d . Dark castaneous. Under-surface densety clothed. 

 Head with two very conspicuous horns at base, concave 

 between same, and a subtriangular ridge between antennae-. 



