42 OEO. H. HORN, M. D. 



slightly sinuate, gente, slightly prominent and very obtuse. Thorax very little 

 narrower in front, the sides arcuate, the margin sparsely fimbriate, hind angles 

 very obtuse, base regularly arcuate without marginal line ; disc moderately con- 

 vex, sparsely minutely punctate at middle, the punctures larger and more nu- 

 merous near the sides. Elytra not wider at base than the thorax, sides very 

 feebly arcuate, humeri obtuse, margin sparsely fimbriate ; disc finely striate, 

 striffi finely, but not closely punctate, intervals slightly convex, finely alutaceous, 

 with fine punctures sparsely placed. Body beneath and abdomen sparsely, in- 

 distinctly punctate, finely alutaceous. Anterior tibiise smooth in front, tridentate 

 externally, the upper tooth small, not crenulate above, the first four tarsal joints 

 equal in length. Posterior femora alutaceous, a few coarse punctures jwsteriorly, 

 the first tarsal joint not as long as the next three, the oblique carinse of the tibia 

 feeble. Length .16-. 18 inch ; 4-4.5 mm. 



Male. — Spur of anterior tibia cultriform, the inner edge of tibia somewhat 

 sinuous. Clypeus deeply and rather narrowly emarginate. 



Female. — Inner edge of anterior tibia straight, the spur slender, curved, acut,'. 

 Clypeus more broadly and less deeply emarginate. 



Although inconspicuous in size this species is remarkable in having 

 a very deep eniargination of the % clypeus with the angles reiiexed. 

 In some specimens the marginal line of the base is slightly distinct, 

 and in this case the very pale color and other details will enable the 

 species to be .separated from those which precede. 



Taken at El Paso, Texas, on the flowers of Larrea mexicana bv 

 Mr. G. W. Dunn. 



A. parens n. sp.— Form rather elongate, slightly broader posteriorly, mod- 

 erately convex, pale yellowish testaceous shining. Head feebly convex, front 

 without trace of tubercles, finely alutaceous, but more shining % , very spar.sely 

 finely punctate % , very little more coarsely J ■ Clyj^eus subtruncate % , very 

 feebly emarginate 9 i the angles rounded, sides arcuate, gense feebly prominent, 

 obtuse. Thorax very nearly twice as wide as long, distinctly naiTower in front, 

 sides fimbriate with moderately long hairs, arcuiate, the hind angles entirely ob- 

 literated by the regular curve of the sides to the base, the latter arcuate, with 

 very feeble sinuation each side of middle, the marginal line fine, but distinct; 

 disc feebly convex, alutaceous, the punctuation fine and spai'se, more distinct in 

 the female, the punctures in front extremely fine. Elytra as wide at base as the 

 thorax, humeri distinct, but obtuse; the strife deep, obsoletely punctate, the in- 

 tervals convex, with a single series of fine punctures, the surface alutaceous, but 

 more shining in % . Mesosternum alutaceous, opaque. Metasternum and abdo- 

 men with very few fine puuctures, surface shining. Anterior tibia smooth in 

 front, tridentate externally, the upper tooth very small, but more distinct in J , 

 the apical tooth unusually long and acute, first tar.sal joint as long as the second. 

 Posterior femora with a row of distant obsolete punctures near the hind border, 

 first tarsal not quite as long as the next three. Length .12 inch ; 3 mm. 



No sexual differences have been observed other than those noted 

 above. 



