CCENOCIIILUS. 207 



slender autecoial process. Mesosternum not produced. Last 

 pair of spiracles, and sometimes one or two pairs immediately 

 preceding, situated upon i)rominent tubercles. Pront tibia armed 

 with two teeth placed close together at the extremity. Tarsi 

 slender (except in C. mrtipes and Utjn-obanicus, in which they are 

 thick and compact), five-jointed, with the basal joint short. In 

 the front legs the first "two joints are concealed, as seen from 

 above, by the anterior prolongation of the tibia. Basal joint of 

 antenna very large and triangular, the footstalk very short and 

 compact. Mandibles moderately strong and sharp. Maxillary 

 lobes forming two collateral pairs of extremely sharp and slender 

 teeth. Mentum vertical in front and very broad, completely 

 concealing the labial palpi. 



o . The abdomen is arched and sometimes deeply excavated. 

 In certain species there are also brush-bearing appendages at the 

 inside of each of the hind tibiae. 



Mr. T. R. D. Bell has found specimens of this genus in the 

 arboreal nests of a species of Aut. 



Key to the Species. 



1 (14) Xot,orlittle,coiistrictedatthe waist; 



last spiracle alone prominent. 

 •2 (13) Front tibia moderately slender, bi- 



dentate. 



3 (12) Upper surface shining, not closely 



sculptured. 



4 (11) Dorsal part of elytra smooth. 

 .5 (10) Prouotum strongly punctured. 



6 (7) Head closely punctured with a sharp 



tubercle between the eyes (/j-acilipes, Moser, p. 208. 



7 (6) Head coarsely rugose, with a trans- 



verse ridge between the eyes. 



8 (9) Pronotum widest behind the middle, brunneus, Saund., p. 208. 



9 (8) Pronotum widest before the middle , solidus, sp. n., p. 209. 



10 (5) Prouotum very finely punctured .... nitidus, s^. n., t^. 210. 



11 (4) Dorsal part of elytra in part finely 



rugose acidipes, sp. n., p. 210. 



12 (3) Upper surface closely sculptured ... . pyyidialis, i&n^Qn, -^.211. 



13 (2) Front tibia very stout, with a 3rd 



tooth near the base tmheciila, Schaum,p. 212. 



14 (1) Much constricted at the waist ; two 



or three spiracles prominent on 

 each side. 



15 (18) Legs moderately long, 



16 (17) Metasternum rugose campbelli, Saund., p. 212. 



17 (IC) Metasternum with horseshoe-shaped [p. 213. 



impressions taprohankns, "Westw., 



18 (15) Legs very short and stout curdpes, Westw., p. 213. 



"Pilinurrjiis" J ev eill e i, ±sonh'ied, is evidently a species of the 

 genus CcenochUus, but I am not able to identify it. 



