330 COLEOPTERA OF NORTH AMERICA. 



coxae angulated, closed, prosteniuni not abbreviated in front ; 

 mesosternum truncate between the coxie, cavities angulated, but 

 scarcely open externally. Ventral segments, 1st and 5th a little 

 longer, 5th truncate at tip. Legs moderate, thighs feebly clavate, 

 middle tibi* without tubercle, hind tarsi with 1st joint neai'ly as 

 long as the two following, last joint as long as the first, ungues 

 approximate, divergent. 



Specimens from the Southern States and Texas have the elytra 

 obliquely subtruncate, and the hairs longer; in those from New 

 Mexico the elytra are almost rounded at tip, and the hairs are 

 shorter. These differences are not of specific value. 



Tribe XIII.— HIPPOPSI.\I. 



The body is extremely slender, the antennaj very long in the 

 first group, short in the others ; the front is very long and 

 inflexed, so that the mouth is near to the prosternum; it is small, 

 and the mandibles are nearly perpendicular to the inflexed front; 

 the support of the labrum coriacecius, the palpi not slender, and 

 the last joint almost conical and pointed. The eyes are coarsely 

 granulated, emarginate or divided; in the latter case, the upper 

 lobe is sometimes (Spalacopsis) wanting. Prothorax long, cylin- 

 drical ; elytra elongate. Front coxse angulated in Hippopsis, 

 rounded in the others, closed behind; middle ones open externally, 

 niesosternnm truncate between the coxiB. Ventral segments 

 nearly equal, the 1st sometimes longer, 5th broadly truncate. 

 Legs rather short, equal, middle tibiie with an external tubercle, 

 tarsi as long as the tibias, 1st joint of hind pair short, or slightly 

 elongated (Hippopsis), last joint rather long, claws divergent. 



Our genera are the following: — 



Front coxie angulated. 



Front coxae rounded ; antennae short. 3. 



2. Antennae very long. Hippopsis. 



3. Eyes divided. 4, 

 Antennse very pilose, scape not longer than 3d joint ; eyes emarginate, 



upper lobe narrow. Dorcasta. 



4. Both lobes of eyes present ; scape of antenn.-e moderate. Sicyobius. 

 Upper lobe of eyes wanting ; scape of antennje very long. 



Spalacopsis. 



Dorcasta Pa^coe is equivalent to Ji^gilopsis Horn, and one 

 species, D cinerea Horn, occurs in Texas. 



