NORTH AMERICAN COLEOPTERA. 283 



sutural angle obtusely roiiiuled, disc moderately convex, the punctuation distinct, 

 moderately close at base and coarser than that of the thorax, finer at apex. Ab- 

 domen very distinctly punctate. Anterior and middle legs pale yellowish testa- 

 ceous, the punctuation slightly darker. Length .08 inch. ; 2 mm. 



In the male the h\st v'entral segment is sinuate each side, the mid- 

 dle produced in a slight lobe, which has a triangular impression 

 which extends to the base of the segment. 



The color at first sight will readily distinguish this species. The 

 thorax is more nearly square than in the others of this series. 



Occurs in New Mexico. 



12. L<. alteruata. Ziegl. — Oblong oval, moderately convex, rufocastaneous, 

 shining. Antennte three-fourths the length of the body, piceous, four ba.sal 

 joints pale, joints 2-3 4 equal in length. Head smooth, impunctate. Thorax 

 one-third wider than long, apparetitl.y slightly narrowed in front, sides arcuate, 

 the oblique truncation scarcely evident, disc convex, nearly smooth, a few sparsely 

 placed, fine punctures along the base. Elytra wider at ba.se than the thorax, 

 humeri rounded, umbone feeble, form regularly oval, sutural angle rounded, disc 

 conve.x, the punctuation moderate, not deep nor closely placed, very confused 

 finer near the sides. Body beneath similar in color to the upper surface. Ab- 

 domen smooth, sparsely punctate. Legs rufote.staceous, the anterior and middle 

 paler. Length .10 inch. ; 2.5 mm. 



This is the largest species in the series with the joints 2-3-4 of 

 the antennas of equal length, and has the thorax much le.'^s punctate 

 than in any other. The suture is sometimes narrowly infuscate. 



I have examined the types of Ziegler, Melsheimer and LeConte, 

 and find alternata (Psylliodes), ruhicunda (Aphthona) and riibidns 

 identical. The types of the latter are in bad state. 



Occurs in Pennsylvania, near Denver, Colorado, and at Fort 

 Laramie (LeConte). 



13. li. montivagtis n. sp. — Oval, convex, moderately robust, brownish, 

 shining. Anteunse slender, rufotestaceous at base, the outer five joints piceous. 

 joints 2-3-4 equal in length. Head shining, impunctate. Thorax one fourth 

 wider than long, not narrowed in front, sides feebly arcuate, anterior angles in- 

 distinctly obliquely truncate, disc convex, shining, not alutaceous, the punctua- 

 tion coarse and close, but not deep, finer toward the sides and nearly as coarse 

 as that of the elytra. Elytra distinctly wider at base than the thorax, humeri 

 obtusely rounded, umbone moderately distinct, form regularly oval, widest at 

 middle, sutural angle distinct, very little obtuse, disc convex, shining, punctua 

 tion moderately coarse, close and deep, finer toward apex, confused. Body be- 

 neath as dark, or darker than above. Abdomen coarsely, sparsely punctate. 

 Anterior and middle legs rufotestaceous, posterior femora piceous, alutaceous and 

 distinctly punctate, tibise paler. Length .07 — .08 inch.; 2 mm. 



