108 OTIORH-YNCHIDJE. 



[Horn. 



This insect has been mentioned by Dr. Leconte (Amer. Nat. 1874, p. 

 457) as being probably a Macrostylus. 

 Occurs in Texas. 



Tribe V. PRO9IEOPINI. 



Rostrum short, stout, dilated, (Coleocerus) or not (Eudiagogus) in front, 

 tip emarginate. Antennae moderate, scape passing the eyes or not, funicle 

 7-jointed; club oval. Scrobes deep, arcuate, confluent or not beneath. 

 Thorax with large lateral lobes and deeply emarginate beneath. Scutellum 

 distinct. Abdomen normal. Tibiae feebly mucronate. Tarsal claws 

 free. 



This tribe, corresponding with that of Lacordaire, may be considered 

 the most sharply denned and natural of the division. Its small and re- 

 tracted mentum, large thoracic lobes and the deep emargination of the 

 front of the thorax beneath, at once distinguish it. As in the preceding 

 tribe the gena?. are entire and the mandibles covered at base. 



The following are the genera in our fauna: 

 Rostrum strongly dilated at tip, scrobes meeting 



beneath the eyes ; mesosternum protuberant... COLEOCERTJS, 

 Rostrum very feebly dilated, cylindrical flattened, 

 scrobes not meeting beneath the eyes but turn - 

 ing forward. Mesosternum not protuberant. 

 Elytra broadly oval, scutellum small. Metaster- 



num short ARACANTHTJS. 



Elytra oblong, broader at base than the thorax, 

 scutellum transverse. Metasternum mode- 

 rately long EUDIAG-OG-US. 



In the last two genera the articular cavities of the hind tibiae are shallow, 

 the outer free edge is, however, double in Eudiagogus. In Coleocerus the 

 hind tibiae is truncate at tip, forming an oval, scaly space, the outer edge 

 of which is formed by a moderately sharp ridge not margined with 

 spinules. The tibiae are feebly mucronate in all of the genera, although the 

 contrary is stated by Lacordaire. 



COLEOCERUS Sch. 



Coleocerus Schonh. Gen. Cure, v, p. 927. 



Bathyris Lee. Amer. Nat. 1874, p. 461. 



Rostrum not longer nor narrower than the head, very short and stout, 

 alse prominent laterally and beneath, tip emarginate, in front of each eye a 

 triangular impression, above a longitudinal groove. Scrobes sharply de- 

 fined, arcuate and confluent beneath. Eyes oval, pointed beneath, not pro- 

 minent. Antennas moderate; scape gradually clavate, attaining the front 

 of the eyes; funicle 7-jointed, 1-2 longer, the first longer than the second, 

 3-7 short, gradually decreasing; club oval. Thorax variable, trapezoidal 

 (dispar) or transverse (marmoratus), ocular lobe broad and prominent. 

 Scutellum transverse, enclosed by the elytra. Elytra oblong oval, parallel, 



