226 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



may be regarded as of generic value. Its chief characteristics 

 are : — 



General form elongate ; size rather larger than is usual in 

 Promecoderus. The sides of the head only slightly swollen behind 

 the eyes to inclose them ; the eyes not prominent. Mentum with- 

 out any median tooth. Labrum transvei'se, with a light median 

 sulcus. Palpi : maxillary with last joint thick, cylindric, 

 truncate ; labial the same, but thicker ; $ with the last joint of the 

 palpi much thicker than in 9. Legs : the thighs thick in the 

 middle ; the anterior tibiae wider at the end than in Promecoderus 

 (the apex being slightly produced externally), the rough spinous 

 portion of the lower surface extending considerably above the 

 upper internal spine ; ^ with four first joints of the anterior tarsi 

 dilatate and spongiose below ; middle tarsi with three or two (C. 

 amabilis) first joints spongiose below ; ^ with a very small denti 

 form protection on the lower side of the anterior tibiae near the 

 coxse (in C. amabilis hardly perceptible). ^ with one setigerous 

 puncture on each side of the anus, 9 with two. 



CerOTALIS SEMIVIOLACEA. 



C . semiviolacea, Casteln. Z.c. p. 175; Proinecoderus semiviolacea, 

 .Putz. Stett. Ent. Zeit. 1868, p. 336 ; Revis. 1873, p. 325. 



A well known South Australian species from Port Lincoln ; I 

 have also received a specimen from the Rev. T. Blackburn from 

 the Adelaide district. A detailed description is unnecessary. It 

 is smooth, shining ; of a rather bronzy black above (sometimes 

 with a purplish reflection towards the sides and base of the pro- 

 thorax), the under surface of a violet-blue with the legs black. 

 The upper surface is rather flat ; the prothorax considerably nar- 

 rowed behind ; the elytra widest behind the middle, and narrowing 

 to the shoulders. The following are the measurements of a typical 

 specimen (^) — Length 17, breadth 5 J, prothorax 5^x5^, elytra 



9 X 5i mm. 



Cerotalis substriata. 



C. substriata, Casteln. I.e. p. 175 ; Promecoderiis substriatus, 

 Putz. Stett. Ent. Zeit. 1868, p. 335 ; Revis. 1873, p. 325. 



