TANTMECIDES. 61 



30 (25) Elytra without projecting 



shoulders,* the lateral edges 

 not emarjjiuate near the base. 



31 (38) The episterual suture of 



the nietasternum distinct 

 through out. 



32 (35) Base of eh'tra abruptly mar- 



ginate. 



33 (34) Rostrum with a lou>j:itudinal 



impression along the dorsal 

 margin ; submentum not pe- 

 dunculate; mentum with two 

 setc-e Sympiezomias, B'st., p. 159, 



34 (33) Rostrum without such an im- 



pression ; submentum with a 

 very short peduncle; mentum 

 with four or six setae Leptomias, Fst., p. 172. 



35 (32) Base of elytra not abruptly 



marginate, but sloping 

 gradually to the junction 

 with the mesonotum. 



36 (37) Corbels of hind tibiae broadly 



enclosed; rostrum without 

 an impression in front of tlie 

 eye Xtlinophorus, Fst., p. 191. 



37 (36) Corbels of hind tibia? open; 



rostrum with a deep impres- 

 sion in front of the eye .... Hyperomias, g. n., p. 194. 



38 (31) The episterna fused posteriorly 



with the metasternum. 



39 (40) Scape reaching only the middle 



of the eye ; corbels of hind 

 tibifB broadly enclosed ; c^ 

 with the median coxfe and 

 hind tibire normal Geotragus, Sehb., p. 196. 



40 (39) Scape reaching the hind mar- 



gin of the eye ; corbels of 

 hind tibia3 not or very nar- 

 rowly enclosed ; c? with the 

 median coxae produced into a 

 tubercle or laminate process, 

 the hind tibite curved or 

 sharply bent at the apex. 



41 (42) Basal margin of elytra nar- 



rowly elevated Pachynotus, Redt., p. 201. 



42 (41) Basal margin of elytra not 



elevated Achl.enomus, Wtsh., p. 202. 



* lu some species of Sj/ inpiezomias there is a small angular projection close 

 to the base of the elytra, but tliis is merely an external process, and not a 

 shoulder in the sense here indicated. A true shoulder is accompanied by a 

 corresponding indentation on the lower surface of the elytra, which serves to 

 accommodate the base of the wing, and its presence may be taken as a fairly 

 reliable indication of tiie occurrence of functional wings. In Sy7H2nes07iiias 

 these organs are quite rudimentary. 



