330 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



uniformly curved; slightly expanded laterally and ventraUy at an- 

 tennal insertion, apical two-thirds nearly cylindrical; basal fourth 

 moderately punctured and pubescent, remainder smooth, glabrous, 

 and shining. Antennae inserted at distance from eye equal to width 

 of frons, of male slightly distad of basal fourth of beak, of female at 

 basal fifth; first segment shorter than next two; second segment 

 shorter than next two; club 0.18 by 0.08 to 0.21 by 0.09 mm. Eyes 

 moderately prominent; frons moderately wide, with slight, narrow 

 median sulcus and two lateral rows of punctures. Prothorax at base 

 one-eighth wider than long, middle slightly narrower than base, apex 

 three-fourths as wide as base; sides with slight lateral expansion at 

 base, slightly expanded to middle, rounded to constricted apex; in 

 profile dorsal surface slightly arcuate, flattened basally and apically; 

 punctation 0.02 to 0.03 mna. in diameter, deep, interspaces variable, 

 usually less than diameter of punctures; basal fovea moderately deep, 

 about one-fourth length of prothorax. Elytra at humeri two-fifths 

 wider than prothorax at base, 2.5 times as long as prothorax, length 

 to width as 10:7.5; intervals twice as wide as striae, nearly flat, with 

 one or two rows of punctures, striae deep, fine. Scutellum roundly 

 triangular, about 0.08 by 0.06 mm., with moderate, median furrow. 

 Front femora 3.75 times as long as wide. Claws with acute basal 

 tooth. 



Special male characters: Tibiae 2 and 3 armed with moderately 

 long, subangulate mucrones. 



Material examined: Male and female determined by Hans 

 Wagner. 



Known distribution: 



Mexico: Guanajuato. Guerrero: Amula; Chilpancingo (BMNH). 



Guatemala: Guatemala City (BMNH). 



Apion (Trichapion) submetallicum Boheman 



Figure 11, e,i,m 



Apion submetallicum Boheman, in Schoenlierr, Genera et species curculionidum 

 vol. 5, p. 376, 1839. — Sharp, Biologia Centrali-Americana. Insecta, Coleop 

 tera, Curciilionidae: Apioninae, vol. 4, pt. 3, p. 48, 1890. 



Apion hystriculum Sharp, Biologia Centrali-Americana. Insecta, Coleoptera, 

 Curculionidae: Apioninae, vol. 4, pt. 3, p. 56, 1890. — Wagner, Arch. Naturg. 

 Berlin, vol. 78, p. 108, fig. a, 1912. New synonymy. 



Description: Length, 2.5 to 3.0 mm. 



Moderately robust. Black; pubescence conspicuous, fine, white, 

 sparse, denser and coarser at base of elytra interval 3, laterally and 

 ventrally. Male beak three-fourths as long as head and prothorax, 

 slightly curved, moderately dilated laterally and ventrally at antenna! 

 insertion, attenuate to apical third which is nearly cylindrical; moder- 

 ately punctured and pubescent in basal two-thirds, apex smooth, 



