306 GEO. H. HORN, M. D. 



It resembles a little^, euphorbice Fab., but it is much broader and 

 of a browner black color. 



The thorax, the sides of which are rounded, shows some sparse 

 punctures feebly impressed. The elytra are twice as wide as the 

 thorax, slightly globose and feebly prolonged at the extremity, they 

 are rather strongly punctured. The base of the antennae, the tibiae 

 and tarsi are of a reddish black color. 



From California. 



The figure given, although very poor, looks very like a Chpetoc- 

 nema. It is very likely that this is one of the things obtained from 

 Dupont, and that it was collected near the Rio Grande. 



Group XVI.— DIBOLI^. 



Antennae 11-jointed. Anterior coxal cavities open behind. Head 

 retracted. Thorax without any ante-basal impressions. Posterior 

 tibiie with a long, rather broad terminal spur, which is more or 

 less deeply emarginate at apex. Fl. VII, fig. 17. 



These few characters amply define the group. In fact the form 

 of the posterior tibial spur of itself from a suflftcient limitation. 



Two genera constitute this group, — Dibolia and Megistops, the 

 latter distinguished by having the eyes contiguous on the vertex. 

 Several species were described by Boheman and credited to Califor- 

 nia, but there can be no doubt that they should be referred to South 

 America. 



DIBOLIA Lati. 



Head rounded, retracted within tiie apex of the thorax. Eyes 

 slightly reniform. Front carinate, the frontal tubercles distinct. 

 Maxillary palpi rather slender, the terminal joint of slender conical 

 form nearly as wide at base as the third joint. Antennae at least 

 half as long as the body, slightly stouter externally. Thorax broader 

 than long and much narrowed in front. Elytra oval, not wider at 

 base than the thorax, with regular striae of punctures. Prosternum 

 narrowly separating the coxae, the anterior coxal cavities open be- 

 hind. Legs moderate in length. Posterior thighs strongly dilated, 

 the tibiae slender at base, broader at the extremity, terminated by a 

 rather long and broad spur, wdiich is deeply emarginate at tip ; the 

 tibia grooved on its outer edge and denticulate near the tip. Tarsi 

 slender, first joint one-third the length of the tibia, the claws ap- 

 pendiculate. 



