378 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



together in Florida. The southern range of A. rostrum Say extends 

 into Florida. A. rostrum and A. coloradense Fall overlap in range 

 in Kansas and probably in surrounding States. A. commodum Fall 

 is a northern species occurring in Montana and Manitoba. A. 

 mexicanum Wagner occurs in the mountains of central Mexico. 



The males of three species, A. rostrum, A. coloradense, and A. mexi- 

 canum, have tibiae 2 and 3 mucronate. The tarsi of A. rostrum are 

 stouter than those of the other species, the second tarsal segment is 

 as long as wide and not longer than the lobes of the third segment, 

 and the species is large, ranging from 2.5 to 3.0 mm. in length. The 

 other two species are generally less than 2.5 mm. long and the second 

 tarsal segment is longer than wide and longer than the lobes of the 

 thu'd segment. A. coloradense and A. mexicanum are closely allied 

 species. The prothorax of the former is slightly constricted apically 

 and the beak is strongly punctured in rows. The prothorax of the 

 latter is distinctly constricted apically and the beak is finely punc- 

 tured beyond the middle. The males of three species, A. commodum, 

 A. confertum, and A. furtivum, have all thi-ee tibiae mucronate, the 

 front pair generally has a minute mucro. The dorsal margin of the 

 antennal scrobe of the last species is nearly horizontal and the tibial 

 mucrones are rather short. The dorsal margin of the antennal scrobe 

 of the other two species is oblique and somewhat angulate. The tibial 

 mucrones of the male of A. commodum are denticulate, elytral interval 

 2 has two or more rows of fine scales, and the beak is not strongly 

 dilated at the antennal insertion and is somewhat cylindrical apically. 

 The tibial mucrones of the male of A. confertum are simple, elytral in- 

 terval 2 has a single row of scales, and the beak is strongly dilated at 

 the antennal insertion and is strongly attenuate toward the apex. 



Apion {Trichapion) coloradense Fall 



Figure 19,d,e 

 Apion coloradense Fall, Trans. Amer. Ent. Soc, vol. 25, p. 152, 1898. 



Description: Length, 2.00 to 2.60 mm.; width, 0.94 to 1.18 mm. 



Moderately robust. Black, antennae piceous; pubescence white, 

 fine, very sparse, not denser laterally. Male beak longer than head 

 and prothorax combined, one-half longer than prothorax; more 

 strongly deflexed at basal third; in lateral view expanded ventrally 

 at antennal insertion, apical two-fifths nearly parallel; in dorsal view 

 expanded laterally at antennal insertion, basal two-fifths attenuate, 

 apical two-fifths nearly parallel; with strong, elongate punctures ar- 

 ranged in rows, tip smooth. Female beak one-half longer than head 

 and prothorax, nearly twice as long as prothorax; moderately curved, 

 more strongly so toward apical region ; in lateral view nearly parallel- 

 sided; in dorsal view stout and parallel in basal third, attenuate to 



