288 PROCEEDINGS OF THE NATIONAL MUSEUM V0L.no 



basal fovea deep, punctiform. Elytra at humeri one-half wider than 

 prothorax at base, nearly three times as long as prothorax, length to 

 width as 3:2; intervals twice as wide as striae, nearly flat, with two 

 rows of fine scales; striae moderately deep, fine. Scutellum elongate- 

 triangular, 0,12 by 0.08 mm. Front femora 3.4 times as long as 

 \vide. Claws with acute basal tooth. 



Special male characters: Tibiae 2 and 3 armed with dentate 

 mucrones. 



Material examined : One male determined by Hans Wagner. 



Type locality: ChUpancingo, Guerrero, Mexico (BMNH). This 

 locality was erroneously attributed to Guatemala by Wagner in his 

 description. 



Apion {Trichapion) plectrocolum, new species 



Figure 4,i,j 



Description: Length, 2.12 mm.; width, 1.06 mm. 



Moderately robust. Black; pubescence white, moderately fine, 

 sparse, coarser and denser on sides of mesothorax and metathorax. 

 Beak of male shorter than head and prothorax combined, one-third 

 longer than prothorax, slightly curved; in lateral view apical three- 

 fifths nearly parallel-sided; in dorsal view moderately expanded at 

 antennal insertion, attenuate to basal three-fifths, here somewhat 

 compressed, expanded siightl}^ tip subparallel; basal four-fifths 

 pubescent, punctured, a distinct sulcus in basal half above antennal 

 insertion, tip bare, smoother. Antennae of male inserted slightly 

 distad of basal fourth, at distance from eye one-fourth greater than 

 width of frons; first segment slightly longer than next three, second 

 segment shorter than next two, club 0.20 by 0.08 mm. Eyes large, 

 moderately prominent; frons about as wide as dorsal tip of beak, with 

 a moderately broad, shallow, median sulcus and one lateral row of 

 punctures. Prothorax at base one-fourth wider than long, middle 

 narrower than base, apex seven-tenths as wide as base; sides beyond 

 basal lateral expansion nearly parallel to middle, rounded to con- 

 stricted apex; in profile dorsal surface nearly flat; punctation about 

 0.03 to 0.04 mm. in diameter, moderately deep, interspaces generall}^ 

 about one-half diameter of punctures, finely alutceous; basal fovea 

 moderatelj^ deep, broader at base, extends about one-third length 

 of prothorax. Elytra at humeri two-fifths wider than prothorax 

 at base, 2.75 times as long as prothorax, length to width as 11:8.5; 

 intervals slightly convex, twice as wide as striae, on disc of elytra with 

 two more or less distinct rows of scales, on declivity with one row of 

 slightly coarser scales; striae moderately deep, fine. Scutellum 

 elongate-triangular, 0.12 by 0.06 mm., with a moderate, median 



