256 AMERICAN COLEOPTEKA. 



latter as long as the two preceding united ; the tibial ridges longer. 

 Specimens taken by Mr. Schwarz at Derning and identified as tosta, 

 are probably the present species, and are so given in the preceding 

 list. Two other forms in my collection are superficially scarcely dis- 

 tinguishable from pallens. One of these, from Onaga, Kansas, 

 agrees fairly well with notes taken upon the type of tosta and is so 

 labeled. Another form, collected at Tyngsboro, Mass., by Mr. 

 Blanchard, by whom it was labeled tosta, seems surely distinct by 

 the following brief characterization : 



iVIordellistena erraiis n. sp. — Entirely yellowish testaceous. Ttiniinal 

 joint of maxillary palpi broadly triangular, scarcely one-half longer than wide, 

 the apical edge as long as the inner. Fourth antennal joint longer than the fifth. 

 Hind tibia with two rather short oblique ridges, not reaching the middle of the 

 face of the tibia, and a very small rudimentary third ridge. First and second 

 joints of hind tarsi with two very oblique ridges, the second joint with rudiments 

 of a third ridge. Length 3.6 mm. 



The fourth antennal joint longer than the fifth is a very unusual 

 character, which I do not recall seeing elsewhere. 



Mordellistena sericans n. sp.— Slender, black, rather densely clothed 

 with grayish silky pubescence; base of antennae and front and middle legs more 

 or less pale. Terminal joint of maxillary palpi about twice as long as wide; 

 fourth antennal joint slightly shorter and narrower than the fifth. Hind tibiae 

 with three short moderately oblique ridges, the upper one sometimes smaller, 

 and a rudimentary fourth one present in some specimens. First joint of hind 

 tarsi with four ridges, the upper one at times feeble ; second joint with two ridges. 

 Length 3-3i mm. 



New Mexico (Gallup, HighroUs, Elba) ; California (Pomona). 



An apparently cotnmon species in the southwest, specimens of 

 which bear the name nnieolor in some collections. The latter is a 

 stouter species with rather less silky pubescence, abdomen pale at 

 apex, and the third tarsal joint with two ridges. 



Mordellistena suspecia n. sp. — Black, linear, pubescence cinereous 

 with sparse fuscous hairs, which on the elytra tend to arrange themselves in lon- 

 gitudinal lines, giving a faint vittate appearance. Last joint of maxillary palpi 

 modei'ately dilated, the apical edge subequal to the inner. Antenna^ piceous 

 throughout, the fourth joint three-fourths as long as the fifth. Hind tibia; with 

 three short slightly ol)lique ridges; first joint of hind tarsus with three, second 

 with two not very oblique ridges. Length 2.5-3 mm. 



Pecos (Cockerell). 



Apparently most nearly related to the eastern convicta. The 

 latter is more evidently vittate, with the front legs and base of 

 antennse pale. 



