107 



wider than its base, the dark part opaque and very minutely 

 pubescent. Front tarsi rather short, basal joint with an inner 

 black comb. Length, 3 mm. 



Hah.— New South Wales: Rydalmere (Dr. E. W. Fer- 

 guson). Type (unique), I. 11955. 



The dark part of the elytra is opaque ; on 3 7 . coatesi and 

 N. impunctatus it is just as highly polished as the pale part. 

 The eyes of the type are still of a vivid green. 



Helcogaster. 



A table of this genus, containing less than half of the 

 now known species, was given in the 1909 revision of the 

 family/ 18 ' but the features by which the species are dis- 

 tinguished are so often on the head, and do not lend them- 

 selves readily to be condensed into brief tabular characters, 

 that a grouping is now given, and only males are included, as 

 it appears to be impossible to identify many of the females 

 with certainty from descriptions. Some of the species, with 

 the head comparatively simple in the male, might be regarded 

 as belonging to Garphurus, but all such doubtful species have 

 very minute rugulose punctures on the elytra, and the 

 antennae feebly serrated at most. An asterisk (*) denotes 

 that the species has been placed in its group by the published 

 characters : — 



1. Antennae with basal joints distinctive. 

 foveicornis, Lea insignicornis, Lea 



2. Prothorax not simple near, or at, apex. 



caviceps, Lea medioapicalis, Lea 



imperator, Lea nigriventris, Lea 



incisicollis, Lea spinicollis, Lea 



S. Basal joints of antennae not distinctive, and prothorax 

 simple near, and at, apex. 

 A. Prothorax partly or entirely dark, 

 a. Elytra entirely dark. 

 ater, Lea hoplocephalus. Lea 



aterrimus, Lea litoralis, Lea 



basirufus, Lea melas, Lea 



canaliculatus, Lea niger, Lea (typical) 



capsulifer, Lea obliquiceps, Lea 



coelocephaltjs, Lea PARALLELUs, Lea 



effeminatus, Lea pulchripes, Lea (variety) 



excavifrons, Lea puncticeps, Lea 



gagatinus, Lea RUFicoRNis, Lea 



genictjlatus, Lea triangulifer, Lea (typical) 



(18) Lea, Trans. Ent. Soc. Lond., 1909, p. 215. 



