254 PROCEEDmGS OF THE NATIONAL MUSEUM vol. iio 



19. Antennae inserted at basal fifth of beak, at distance from eye equal to width 



of frons (San Luis Potosi, Morelos) . . . innocuum, new species (p. 315) 



Antennae inserted at basal third of beak, at distance from eye twice width 



of frons 20 



20. Beak in lateral view attenuating from antennal insertion to apex (Arizona). 



eccentricum Fall (p. 324) 



Beak in lateral view nearly parallel beyond antennal insertion (Puebla, 



M6xico, Morelos; Guatemala) .... punctulirostre Sharp (p. 325) 



21. Fifth ventral segment with lateral apical angles produced into a pair of trian- 



gular processes projecting posteriorly slightly beyond tips of elytra (Tres 



Marfas Island, Mexico) acanonicum, new species (p. 282) 



Fifth ventral segment not so modified 22 



22. Front tibia more or less flattened on inner surface, this area devoid of scales, 



generally polished and noticeably striate; antennae generally inserted at 



distance from eye less than width of frons 23 



Front tibia not so modified 33 



23. First segment of tarsus 1 with outer apical angle produced into a spine . . 24 

 First segment of tarsus 1 simple 26 



24. Size about 2.0 mm.; elytral intervals with two rows of scales which are coarse 



and pearly in color on basal margin of elytra and along basal third of suture; 

 laterally and posteriorly coarse scales are bounded by a region of very fine, 

 yellowish scales; elytra in posterior half and area lateral of interval 5 

 clothed with white, hairlike scales; tibiae yellowish (Guatemala). 



calcaratipes Sharp (p. 312) 



Size less than 1.5 mm., elytral intervals with one row of uniform, fine scales; 



tibiae nearly black 25 



25. Spine on outer angle of first segment of tarsus 1 large, triangular in shape, as 



long as tarsal segment is wide at apex (Brazil, Nicaragua). 



spinitarse Wagner (p. 321) 



Spine on outer angle of first segment of tarsus 1 small, shorter than width of 



tarsal segment (Veracruz, Puebla) .... enophis, new species (p. 314) 



26. Tibia 1 with a short, fiat area less than one-third its length, not or very 



slightly striate (New York-Florida-Texas- Wyoming). 



sayi Gyllenhal (p. 306) 

 Tibia 1 with flat or concave area extending about one-half its length . . 27 



27. Flat area on tibia 1 extremely densely and finely striate so that the area 



appears irridescent, individual striae not discernible 28 



Flat area on tibia 1 with coarser, distinct, well separated striae, not irri- 

 descent 29 



28. Tibial mucrones projecting in line with long axis of tibiae; beak strongly 



attenuate toward apex (Nebraska, Colorado, Oklahoma). 



nebraskense Fall (p. 301). 

 Tibial mucrones projecting at an angle with long axis of tibiae; beak slightly 

 attenuate toward apex (District of Columbia, Tennessee). 



novellum Fall (p. 303) 



29. Tibia 1 straight in anterior view 30 



Tibia 1 deflexed at apical two-fifths in anterior view (Mexico; Guatemala). 



godmani Wagner (p. 297) 



30. Beak in dorsal view distinctly expanded at apex (Guatemala; Puebla, Mexico, 



Distrito Federal) aurichalceum Wagner (p, 296) 



Beak in dorsal view cylindrical at apex 31 



