BY ARTHUR M. LEA. 361 



Helcogaster convexiceps, n. sp. 



<S. riavous; apical tliree-fourtlis of elytra, metasternum, and six apical 

 joints of antennae black. With sparse, dark hairs. 



Head rather strongly and evenly convex; with numerous small, and rather 

 distinct punctures. Antennae longer than usual, none of the joints transverse. 

 Prnthorax with si<les narrowed to base; a rather large, transverse, closed, sub- 

 basal depression; with fairly distinct punctures scattered about. Elytra moder- 

 ately long; with numerous very minute, rugulose punctures. Basal joint of front 

 tarsi with a small black comb. Length, 2.25 mm. 



Ilab. — New South Wales: Illawarra, one specimen in October (G. E. Bryant). 



The head rather strongly convex, nonexcavated, and with distinct punctures, 

 distinguishes from H. trisinuattts, the absence of a frontal tubercle from R. 

 liumeralis and H. seminigripennis, and tlie very different prothorax from H. 

 thoracicus. In my table {I.e., p. 21G) it would be associated with H. simpliciceps, 

 whose head is much less convex, abdomen black, and pale portion of elytra con- 

 tinued along sides. 



CHRYSOMELIDAE. 

 Macrogonus ventralis, n. sp. 



Flavous; head (except base and muzzle), scutellum, elytra, abdomen (except 

 part of basal segment), tarsi, and most of tibiae dark metallic green, with a 

 more or less distinct purplish gloss, a fairly wide median vitta on prothorax, and 

 an oblique spot or vitta towards each side also greenish, five basal joints of an- 

 tennae shining purple, the others opaque purple; tip of mandibles and apical 

 joint of palpi infuscated. 



Head with a triangular iuter-ocular impression, connected with the base by 

 a median line; punctures rather sparse and small, a few larger ones near eyes. 

 Antennae long, extending to about middle of abdomen. Prothorax about one- 

 third wider than median length, all angles slightly armed, apex slightly wider 

 than base, and slightly incurved at middle, sides gently rounded in middle; with 

 sparse and rather small punctures about middle, becoming larger on sides, but 

 all sharply defined. Scutellum long and triangular. Elytra much wider than 

 prothorax, each with three shallow depressions or f oveae, triangularly placed : 

 one on the side at the basal fourth, one half-way between it and suture, the 

 other equidistant from the two front ones; with rows of punctures of moderate 

 size near base, becoming smaller posteriorly; interstices each with a row of very 

 small punctures. Length, 8 mm. 



Ilab. — New South Wales: Comboyne (W. H. Muldoon), unique. 



The type is evidently a female ; it is too close to the female of M. bifoveieolUs 

 to be regarded as other than a Macrogoniis, but possibly with other species of 

 that genus may eventually be transferred to Macrolema. The prothorax is non- 

 foveate, but there is a vague depression on each side of the base. The oblique 

 vittae on the prothorax appear to be hardly more than stains, each extends from 

 near the middle of the apex to near the middle of the side; on each side near 

 the apex, and invisible from above, there is also a stainlike spot; although the 

 elv'tra are dark green, the colour alters with the point of view to dark blue, and 

 then to purple. 



