282 



BOLBOCERAS QU1NQUECORNE, 11. sp. 

 PI. xxxiii., fio;. 50. 

 d . Castaneous, some parts darker than others. Under- 

 surface densely clothed, lower portions of cephalic horn with 

 straggling hairs. 



Head with a rather long suberect horn, its lower two- 

 thirds and the clypens with dense but rather shallow punc- 

 tures; carina on its lower front distinctly elevated in the 

 middle ; canthi feebly concave ; mandibles notched towards 

 apex. Prothorax with a wide, transverse, frontal excavation, 

 with four subcorneal horns overhanging same, between same 

 and base two rather large pear-shaped f oveae ; sublateral 

 f oveae fairly large ; sides with dense punctures as on front of 

 head, with larger shallow punctures irregularly distributed, 

 and with minute ones scattered about ; a shallow median line, 

 but with conspicuous punctures on basal half. Scutellum 

 impunctate. Elytra striate-punctate, thirteenth and four- 

 teenth rows conjoined towards base. Front tibiae with five 

 teeth, hind ones with two small irregular subbasal carinae 

 in addition to two large ones. Length, 23 mm. 



Hah. — Northern Territory: Tennant Creek (J. F. Field). 

 Type, I. 3699. 



Allied to tenax and armigerum, but head with a single 

 elongated simple horn; from tenax also it differs in the two 

 median horns of the prothorax being much closer together ; 

 this should distinguish it also from froggatti, which is stated 

 to have the two median horns wider apart than in tenax; 

 the clypeus is much as on tenax, and both mandibles are 

 conspicuously sinuate, characters which should also be 

 distinctive from froggatti. On the front margin of the 

 prothorax there is a small fovea towards each side, but it is 

 not deep as in Group 1 ; the hind tibiae might be regarded 

 as somewhat similar to those of Group 1, but the clypeus 

 is certainly as on the first subgroup of Group 2 ; the species, 

 however, is so obviously allied to tena.r and armigerum that 

 it should be associated with them in anv table. 



BOLBOCERAS TRIFOVEICOLLE, 11. sp. 



PI. xxxiii., figs. 48 and 49. 



<$ . Castaneous. Under-surface densely clothed. 



Head with three conspicuous, but not very long, erect 



horns between antennae, the outer ones subcorneal, the 



median one truncated or semi-double at its tip ; front portion 



of clypeus almost vertical and somewhat elevated in middle ; 



with crowded punctures, except towards base, where they are 



small and sparse; canthi shallow; mandibles sinuous towards 



apex. Prothorax with a large fovea on each side in front, 



