COLYDIID^E. 445 



cies. Nitidula and its allies are elliptical depressed, often 

 with a broad margin ; the elytra covers the whole abdomen, or 

 leaves merely the tips exposed. In Nitidula the last joint of 

 the labial palpi is not thicker than the preceding, and the 

 species often have two red spots on the elytra, as in Nitidula, 

 bipustulata Fabr. In Epurcea, which is found under stones and 

 bark, the last joint of the palpi is large and thick. Omosita 

 colon Fabr. is also spotted twice with red ; the genus may be 

 recognized by the antennal grooves diverging behind, following 

 the outline of the eyes, while in the males the sixth abdominal 

 segment is wanting. Ips is much longer and larger, with trun- 

 cate elytra, and the head is immersed in the thorax to the 

 eyes. Ips sanguinolentus Say has a broad red band on the 

 elytra, with two large round dots. Ips fasciatus Say (Fig. 

 391, and larva ; found in the roots of the squash by Mr. M. C. 

 Read) has two broad interrupted yellow bands on the elytra ; 

 both species occur about flowing sap in spring. Ips ferruginea 

 of Europe lives on the young of Hylesinus ligniperda. Rliizo- 

 pliagus depresses is known in Europe to attack the larvae of 

 Hylurgus piniperda, according to Dufour. 



MONOTOMIDJE Chaudoir. The species of this inconsiderable 

 group are much like the preceding family in form, but as Le- 

 conte states, differ from them in the anterior coxa3 being small, 

 rounded and separated. They occur under the bark of trees. 



~~~ ! 



TROGOSITID^E Kirby. This group, usually united with the 

 preceding family, is distinguished by the bilobate maxillae, with 

 the short, four-jointed maxillae and the short undilated tarsi. 

 They generally live under bark, but some have been trans- 

 ported over the whole world in grain. In Trogosita, which 

 comprises long insects, with the thorax narrowed behind, the 

 ligula is entire, the tibiae are not spinous, and the thorax is 

 prominently angulated in front. 



COLYDIIDJE Erichson. The small globular anterior and 

 middle coxae, and the four-jointed simple tarsi will enable them, 

 Leconte states, to be readily distinguished from any of the 

 neighboring families. The species are of small size, usually 



