NORTH OF MEXICO. 



283 



The genus Asida must, according to the view here adopted, be considered as one of 

 those polymorphous genera, many of which are already known in the family, with species 

 differing among themselves in characters of vastly less moment than those found among 

 our species of Eleodes, as will be seen hereafter. 



A. opaca, Say, Journ. Acad. TIT, 254. (Euschides) Leo., Ann. Lye. V., 137; Smithson. Contrib. 4to, 1850, 

 PI. 1, fig. !). 



Abundant along the eastern base of Rocky Mts. 



Oval, opaque, humeral angles of elytra prominent, hind angles of thorax acute. Elytra 

 with very indistinct, irregularly confluent elevations. 

 Length .50-.68 inch. 



A. lirata, (Leo.) Proo. Acad. 7, 288. (Asida) Leo., List Col. N. A. Arizona, 



Same form as opaca. Each elytron with (i longitudinal costa 1 on the disc, one sutural, 

 and each with a marginal ridge. 

 Length .60 inch. 



A, p o 1 i t a , Say, Journ. Acad. Ill, 255. 



Found with opaca. Form as in cpaca, hind angles of thorax rectangular. Elytra 

 smooth, shining. Length .60 inch. 



A. Bordida, (Peleoypli.) Leo., Proo. Acad. 6-446. Smithson. Contrib. 4to, 1859, pi. 1, fig. 11. 



The figure cited represents rather a robust form of the species. The hind angles of 

 the thorax are acute and prominent, the disc very coarsely punctured. The elytra have a 

 marginal acute ridge, and two on each elytron becoming confluent a short distance from 

 the apex, the interstices being transversely wrinkled. As varieties of the species I add the 

 following : 



P. cost i p enni s, Lcc, Journ. Acad. 2d Scr. 4-20. 



Differs from the preceding only in having the costse of the elytra better defined and 

 the hind angles of the thorax rather more; acute. 



P. inax] u a lis , Lcc, Journ. Acad. 2d Ser. 4-19. 



P. eager, Lcc, 



These two arc smoother than the typical sordida. They cannot be regarded as spe- 

 cifically distinct. Sordida and its varieties are all from eastern New Mexico and the ad- 

 jacent regions to the eastward. 



A. SB grot a, (Pelecypli.) Lcc, Proe. Acad. 1861-887. 



Thorax as long as broad, narrower behind, sides sinuate posteriorly, base emarginate, 

 angles acute, prominent. Elytra similar in form to sordida, but more attenuate at apex, 

 and more suddenly declivous, sides margined, disc with but one costa on each elytron, 

 extending from near middle of base to two-thirds length of elytron and ending in an 

 acute spine. The interstices between are as in sordida. Abundant in Lower California. 



Length .90 inch. 



