Australian and Tasmanian Malacodermidae. 93 



Two specimens from Somerset agree with the one from 

 Bowen except in having the median areolet of the prothorax 

 slightly wider and the second elytral costa greatly thickened 

 and elevated at the place where it is not parallel with the 

 suture — much more so than in any other species I have 

 seen ; but I cannot regard the two forms as belonging to 

 more than one species. 



Thinking it possible that sulcatus was possibly a synonym 

 or a variety of serraticornis, I wrote to Mr. Waterhouse for 

 his opinion, he replied as follows : — " Trichahts sulcatus and 

 T. serraticornis are quite distinct and my figures are fairly 

 good. We have both sexes of T. sulcatiis. T. serraticornis 

 is a smaller insect, and has a more punctuated thorax. I 

 have only seen the type, which is in poor condition and 

 has lost apex of elytra." 



Hah. Queensland : Brisbane, Port Essington, Bowen, 

 MacKay, Somerset. 



Trichalus FLAVOPICTUS, Wat., Trans. Ent. Soc. Lond., 

 1877, p. 82, PI. II, figs. 92-96 ; 1878, p. 103 ; 111. Typ. Col., 

 p. 67, PI. XVI, fig. 11. 



There are five specimens from N.W.Australia before me 

 which I believe represent a variety of this species, as two 

 females agree exactly in all details of sculpture with a 

 typical specimen from MacKay, whilst the others (males) 

 agree with Waterhouse's description of the male. All five 

 specimens have the discal areolet unclouded and fully half 

 of the femora pallid (not almost only the extreme apex), 

 four of them have the scutellum entirely pallid. The 

 females have the undersurface entirely pallid except that 

 in one of them the four basal segments of the abdomen 

 have an infuscate median blotch ; the males have the 

 sterna pallid, in two of them the abdomen (except at the 

 tip) is entirely black, whilst in the third it is dark only 

 along the middle. 



Hah. Queensland: Bowen, Mackay; N.W. Australia. 



Trichalus ater, Macl. {Xylolanus), P.L.S., N.S.W., 

 1887, p. 233. 



Two co-types of this species are before me ; the species 

 is certainly a Trichahis, having the sutural costa inter- 

 rupted and irregular at base, the second from the suture 



