282 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



Wagner has tibiae 2 and 3 of the male armed with similar, simple 

 mucrones. The male of A. plectrocolum, new species, has the mucro 

 on tibia 3 much longer than that on tibia 2. A. adaetum, new species, 

 has the frons distinctly wider than the dorsal tip of the beak; A 

 imitator and A. plectrocolum have the frons equal to the width of the 

 dorsal tip of the beak. 



The affinites of A. proclive and A. coryi are close to the A. glyphicum 

 group. The main difference between the A. proclive and A. glyphicum 

 groups is that the character of A. proclive which separate it from A. 

 simile Kirby are more stronglj^ developed in the A. glyphicum group, 

 namely the more strongly dentate mucrones of the male; the shorter, 

 stouter beak; the larger, more protruding eyes; the narrower frons; 

 and the much more strongly constricted dorsal portion of the head 

 above the hind margin of the eyes. 



An interesting character shared by the members of this group is a 

 more or less evident row of punctures extending about one-fourth the 

 length of the beak above the antenna! insertion in the male. In A. 

 proclive this row of punctures generally appears as a definite sulcus 

 above the antennal insertion. In the A. glyphicum group the beak of 

 the male has a deep lateral sulcus limited by an upper and lower 

 raised carina. This sulcus is apparently a development of the row of 

 punctures above the antennal insertion noted in A. proclive. 



Apion {Trichapiort) acanonicum, new species 



Figure 3,a-e 



Description: Length, 1.94 to 2.00 mm.; width, 0.09 to 1.00 mm. 



Robust. Black, base of antennae piceous; pubescence white, on 

 dorsal surface very fine, sparse, much coarser and somewhat denser on 

 sides of pro thorax, meso thorax, and meta thorax. Male beak moder- 

 ately slender, five-sixths as long as head and pro thorax, one-fourth 

 longer than pro thorax, slightly curved; in lateral view apical third 

 nearly parallel; in dorsal view slightly expanded laterally at antennal 

 insertion, attenuate to middle, there somewhat compressed, expanding 

 to apical third which is nearly parallel sided to apex; basal two-thirds 

 dull, punctured, sparsely pubescent, a coalesced row of punctures 

 forming a vague sulcus above antennal insertion in basal third, apical 

 third shining, finely, more sparsely punctured. Female beak one- 

 third longer than head and pro thorax combined, twice as long as 

 prothorax, in lateral view nearly parallel-sided to tip, tip somewhat 

 depressed; in dorsal view attenuate beyond antennal insertion, nearly 

 parallel-sided beyond basal third, definitely expanding toward apex; 

 not pubescent beyond antennal insertion, basal three-fourths finely, 

 moderately densely punctate, apical fourth smoother, more shining. 

 Antennae of male inserted at basal fourth of beak, at distance from eye 



