Ill 



9 . Differs in having the head, except the labrum, 

 entirely black, front femora, as well as the others, partly 

 dark, antennae longer and thinner, none of the joints trans- 

 verse, prothorax only slightly wider than long, apex very 

 little wider than base, non-excavated or tubercnlate, and front 

 tarsi combless. 



Hah. — South Australia: Adelaide (Blackburn's col- 

 lection, H. H. D. Griffith, J. G. O. Tepper, N. B. Tin-dale, 

 and A. Zietz), Mount Lofty (R. J. Burton, S. H. Curnow, 

 A. H. Elston, A. M. Lea, and Tepper), Barossa (Elston), 

 Quorn (Blackburn), Noarlunga (Burton). Type, I. 9185. 



Some females were named as H. baxipennis (Fairmaire) 

 in Blackburn's collection, and in many respects thev agree 

 well with the description of that species; but it was described as 

 from Peak Downs in Queensland, and there are so many other 

 species from Queensland and New South Wales that the 

 description would fit equally well, that I think this species 

 (all the specimens of which before me are from South Aus- 

 tralia) should not be regarded as basipennis; in any case the 

 male of the present species has such a distinctive prothorax 

 that it could hardly be confused with the male of anv other 

 species. The excavation of its prothorax varies somewhat, 

 but it is always deep and wide, it is nearly alwavs bounded 

 at each end by a subcorneal tubercle, its front edqe is often- 

 impressed in the middle, and has a feeble elevation on each 

 side of the impression, and as all the elevations are setose the 

 front margin, from some directions, appears quadritubercu- 

 late ; the bottom of the excavation is usually infuscated or 

 black. The impressions on the head of the male are so placed 

 that from some directions the intervening space (armearing 

 as a wide gentle elevation), and the lateral elevations, resemble 

 the broad arrow. From three to five joints of his antennae 

 are pale, on one specimen they are entirely pale; the hind 

 femora are partly black or infuscated, and sometimes the 

 middle ones as well ; the apical joints of all the tarsi are 

 infuscated. The true width of the elytra is very little less 

 than that of the length, but owing to irregular contraction 

 it often appears to be much less. 



Helcogaster medioapicalis, n. sp, 



d . Black and highly polished ; prothorax (except middle 

 of apex), front coxae and femora, and base of middle femora 

 flavous. With very sparse, dark hairs. 



Head wide, largely and irregularly excavated. Antennae 

 moderately long, joints gradually decreasing in width, 

 eleventh about once and one-half the length of tenth. Pro- 

 thorax about as long as its greatest width, sides almost evenly 



