SUBGENUS TRICHAPION — KISSINGER 253 



6. Beak in lateral view noticeably narrowed immediately beyond antennal 



insertion, apical half subcylindrical, polished, and subimpunctate . . 7 



Beak in lateral view not abruptly attenuate, punctured to near apex; tip 



only shining 8 



7. Prothorax deeply punctured; tibiae 2 and 3 with short mucrones; first segment 



of tarsus 1 shorter than segments 2 and 3 combined (Illinois, Nebraska, 



Colorado, Kansas, Texas, Arizona) oblitum Smith (p. 368) 



Prothorax shallowly punctured; tibiae 2 and 3 armed with long mucrones; 

 first segment of tarsus 1 about as long as 2 and 3 combined (Guerrero, 

 Puebla) mediocre Sharp (p. 366) 



8. Antennae inserted at basal fourth of beak at distance from eye equal to width 



of frons; elytra at base one-third wider than prothorax at base (Washington 



to Southern California) cordatum Smith (p. 369) 



Antennae inserted at basal third of beak at distance from eye one-half greater 

 than width of frons; elytra at base one-half wider than prothorax at base 

 (Greorgia, Arkansas) fiirtivum Fall (p. 382) 



9. One pair of tibiae mucronate 10 



Two pairs of tibiae mucronate 21 



10. First segment of tarsus 1 with outer apical angle produced into a spine . . 11 

 First segment of tarsus 1 not so modified 13 



11. Beak in dorsal view attenuate from antennal insertion to apical third . . 12 

 Beak in dorsal view nearly parallel-sided from antennal insertion to apex 



(Mexico) latitator, new species (p. 317) 



12. Antennae yellowish, inserted at distance from eye slightly less than width of 



frons; dorsal surface of beak clothed with scales coarser, shorter, and whiter 

 than those on dorsal surface of prothorax, intervals in part with two rows 

 of punctures (San Luis Potosf and Puebla) . iunocens, new species (p. 314) 

 Antennae dark, inserted at distance from eye slightly greater than width of 

 frons; dorsal surface of beak clothed with scales similar to those on dorsal 

 surface of prothorax; intervals with one row of punctures (Guatemala, 

 British Honduras) brachycephalutn Wagner (p. 310) 



13. First segment of tarsus 1 elongate, four times as long as wide (Michoacdn, 



Puebla) niiranduna, new species (p. 318) 



First segment of tarsus 1 not elongate 14 



14. Tarsus 1 with first segment with inner margin strongly rounded from base to 



apex, forming a broad, rounded lobe projecting distally beyond apex of 

 segment, from above inner portion of segment much broader than outer 



half (Veracruz) mirificutn, new species (p. 319) 



Tarsus 1 with first segment not so modified 15 



15. Front femur distinctly swollen, antennae inserted at basal fourth of beak, at 



distance from eye equal to width of frons (Michoacdn). 



caenutn, new species (p. 312) 

 Front femur not swollen 16 



16. First segment of tarsus 3 with inner angle produced into a short spine (Vera- 



cruz, Panama) sancti-feiicis Sharp (p. 320) 



Tarsus 3 simple 17 



17. Antennae inserted at not more than basal third of beak 18 



Antennae inserted just behind middle of beak, yellowish; beak strongly 



deflexed at middle (Arizona) brunnicornis Fall (p. 323) 



18. Beak shorter than prothorax, stout; size greater than 3.5 mm. (Puebla). 



bettyae, new species (p. 263) 

 Beak longer than prothorax, slender; size less than 2.8 mm 19 



