285 



inner front corner of the ocular canthus; the latter with front 

 edge gently incurved and outer front angle lightly rounded 

 off; clypeal elevation in the form of an acute undulating 

 ridge, with its sides tuberculate ; front face of clypeus (middle 

 area) almost vertical, asperate-punctate ; left mandible evenly 

 rounded and then obliquely truncate to apex. Froth orax 

 with sides strongly rounded and finely (almost evenly) ser- 

 rated ; with irregularly distributed punctures, varying from 

 sparse and minute to coarse and crowded, more crowded on 

 the sides and larger across middle than elsewhere; with two 

 subtriangular tubercles slightly nearer apex than base and 

 almost directly posterior to the subocular tubercles, the two 

 connected by a curved carina ; with a rather deep and fairly 

 large excavation from apex (where it is deepest) to just out- 

 side of each of the submedian tubercles ; sublateral foveae 

 rather large and irregular. Elytra rather lightly striate- 

 punctate. Front tibiae with five teeth, hind tibiae bicarinate. 

 Length, 12-13 mm. 



O . Differs in having the head, more densely punctate, 

 the ridge between the eves more obtuse and not ending in 

 tubercles, clypeal elevation slightly higher in the middle than 

 at sides, front face of ctypeus with larger and more regular 

 punctures, frontal excavations of prothorax reduced to 

 shallow depressions and the discal tubercles absent, but with 

 the connecting ridge distinct and bisinuate. 



Hah. — Northern Territory : Daly River (EL Wesselman). 

 Type, I. 5768. 



Belongs to the first subgroup of Blackburn's second 

 group of the genus, although the male has two foveae close 

 to the front margin of the pronotum (inconspicuous on the 

 female, however), and in his table would be associated with 

 taurus, from which the male differs in having the cephalic 

 elevations much smaller, those in front closer together, the 

 prothorax with two small processes, and the frontal excava- 

 tions much smaller and shallower; the female differs from 

 the female of t'mirus in having the transverse elevation 

 between the eyes not tuberculate, the clypeal elevation 

 different, and the pronotum with a semi-double median 

 transverse ridge, and with very different punctures. In some 

 respects it approaches some small females of fr on tale and 

 hoplocephalnm., but the elytral striation is less profound and 

 the clypeal elevation is very different; the male, however, is 

 very different to the males of those species. 



BOLBOCERAS PENTAGONICUM, 11. sp. 

 PI. xxxiii., figs. 56 and 60. 

 Flavo-castaneous, tips of some projecting parts black or 

 blackish.. • In places densely pilose. 



