H. C. FALL. 117 



Collections of Dr. Horn, Hubbard, Sclnvarz and the National 

 Mu-seuni. 



The sexes are more strongly differentiated than in any other spe- 

 cies known to me. When males are at hand the strongly dilated 

 front tibiae will make this species easily recognizable among an 

 otherwise difficult group. 



10. A. virile n. syi. — Form narrow, entirely black; pubescence very sjjarse 

 and iine, but quite evident in well-preserved specimens. Beak { % ) not very 

 slender, shorter than the head and prothorax, moderately dilated, scarcely more 

 slender beyond the dilation than at the base; surface finely strigose, scarcely 

 visibly so toward the tip, wliich is shininor; punctures fine and sparse. First 

 joint of antennPB barely as long as the next two, second and third subequal in 

 length, third evidently longer than the fourth. Front canaliculose: eyes not 

 very prominent. Prothorax a little longer than wide: base very little wider 

 than the apes; sides somewhat prominent at the middle; surface rather finely, 

 not closely i)unctate; impressed line nearly complete. Elytra narrow, fully three- 

 fourths longer than wide; humeri moderate, post-humeral sinuatiou feeble; sides 

 feebly diverging to the middle. Beneath sparsely, finely punctate; legs moder- 

 ate: claws with merely an obtuse angulation at the base. Length 2-2.3 mm.! 

 .08-.09 inch. 



%, . Sutural angles rounded ; second antennal joint setiferous ; femoial tuber- 

 cle prominent, closely striate throughout its lateral face ; anterior tibiae rather 

 abruptly but not strongly widened and parallel in apical two-thirds, mucro of 

 middle and hind tibige minute; metasternal spicules small. 



9 . Not seen. 



Hah. — Colorado (Greeley). 



Two males taken by Mr. A\'^ickham. 



11. A. inelaiiariiiin Gerst. — Elongate, black, shining, sometimes with 

 faint, aeneous lustre; pubescence very sparse and inconspicuous. Beak {%) 

 scarcely as long as the head and prothorax, nearly cylindrical, moderately dilated, 

 finely .sculptured and punctulate, smoother toward the tip ; ( 9 ) longer and more 

 arcuate, very slender, not dilated, smoother. First joint of antennae subequal to 

 the next two C^), .seldom as long, and never longer than the next three (9). 

 Front rather narj'ow, slightly depressed, canaliculose ; eyes Jiioderate. Prothorax 

 longer than wide; sides very feebly diverging from apex to base, more or less 

 prominent at the middle; surface rather finely, usually not very closely punctate; 

 impressed line nearly or quite complete. Elytra narrow, nearly twice as long as 

 wide, widest at the middle; humeri moderate, post-humeral sinuation evident' 

 striae moderate; intervals nearly flat, about twice as wide as the striae. Beneath 

 finely, sparsely punctate; legs slender; claws nearly simple. Length 1.7-2.2 

 mm. ; .07- .09 inch. (PI. II. figs. 7 and 22). 



%. Femoral tubercle very prominent ; smooth area, not or scarcely striate; 

 limiting ridge strong; sutural angles rounded; other characters as usual. 

 9. Tips of elytra moderately jiroduc^ed. 



Hub. — ^Massachusetts, Long Island, District of Columbia, Penn- 

 sylvania, Canada, Michigan, Illinoi.s, Iowa, Kansas, Texas. 



TRAXS. AM. ENT. SOC. XXV. OCTOBER, 1898. 



