NORTE OF MEXICO. 



The genus Wda must, according to the view here adopted, be considered as 

 those polymorphous genera, many of which arc 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, Joum. Acad. III. 254. Euschides Lee, Ann. Lye. V., 107; Smithson. Contrib. 4to, 16 

 PI. 1. I 



Abundanl along the eastern base of Rockj Mts. 



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

 with very indistinct, irregularlj confluenl elevations. 

 Length .50-.68 inch. 



A. lirata, Lee. Proc. Acad. 7. 223. Asida) Lee., List Col. N. A. Arizona. 



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

 and each with a marginal ridge. 

 Length .60 inch. 



A. polita, Say. Joum. Acad. 111. 255. 



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

 smooth, shining. Length .60 inch. 



A. Bordida, Peleeyph. Lee., Proc. Acad. 5-446. Smithson. Contrib. 4to, 1859, pi. I. fig. 11. 



Tin' figure cited represents rather a robust form of tic- species. The hind angles ol' 

 the thorax are acute and prominent, the disc rery coarsely punctured. The elytra havea 

 marginal acute ridge, and two on each elytron becoming confluenl a shorl distance from 

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



follow ing : 



P. costipennis, Lee., Joum. Acad. 2d Ser. 1 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. Lnasqnalis, Lee., Journ. Acad. 2d Ser. 4-19. 

 1'. aeger, Lee, ' 



These two are smoother than the typical ^ \rdida. They cannot be regarded as spe- 

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

 jacent regions to the eastward. 



A segrota, Peleeyph. Lee., Proc. Acad. 1861 :'.'-'.7. 



Thorax as long a- broad, narrower behind, side^ sinuate posteriorly, base emarginate, 



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



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



iding 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. 



1 ,i Qgth .!>!» inch. 



