SUBGENUS TEICHAPION — ^KISSINGER 257 



55. Mucrones minute; dorsal margin of antennal scrobe evenly descending to 



below eye (Florida) pervicax Fall (p. 360) 



Mucrones larger; dorsal margin of antennal scrobe somewhat angulate above 



antennal insertion 56 



66. Mucrones short, eubangulate (New Jersey, Florida, Mississippi, Indiana). 



perforicolle Fall (p. 343) 

 Mucrones long, simple (Georgia, Florida, Mississippi). 



importunum Fall (p. 353) 



57. Pubescence noticeably denser at base of elytral interval 3; size generally less 



than 1.6 mm 58 



Pubescence on elytra uniform; size greater than 1.6 mm 59 



58. Mucrones projecting at an angle with tibiae; elytral intervals nearly flat 



(Guerrero; Guatemala) perpilosum Wagner (p. 329) 



Mucrones in basal half projecting in line with long axis of tibiae; apical half 

 curved out laterally; elytral intervals moderately convex (Tabasco; Guate- 

 mala; Panama) auriferum Wagner (p. 327) 



59. Frons wider than dorsal tip of beak, not sulcate; prothorax at base one-fifth 



wider than long; elytral intervals moderately convex; size 1.6 to 2.0 mm. 

 (Arizona; Baja California, Chihuahua, Guerrero) . aeqiiabile Fall (p. 259) 

 Frons as wide as dorsal tip of beak, with shallow median depression; pro- 

 thorax at base one-third wider than long; elytral intervals nearly flat; size 

 greater than 2.1 mm 60 



60. Middle and hind tibiae with similar mucrones, both acutely angulate ven- 



trally (Guerrero; Guatemala) imitator Wagner (p. 286) 



Middle tibia with a short, acutely angulate mucro, hind tibia with long, 

 slender, straight mucro projecting at about 120° from tibia (Distrito 

 Federal) plectrocolum, new species (p. 288) 



61. Beak as long or longer than head and prothorax combined 62 



Beak distinctly shorter than head and prothorax combined 67 



62. Antennae inserted at distance from eye four times as great as width of frons; 



beak one-fourth longer than head and prothorax; mucro 2 short, subangu- 

 late; mucro 3 long, curved; size 2.25 to 2.50 mm. (Puebla, Michoacdn, 



Guei'rero; Guatemala; Honduras) gracilirostre Sharp (p. 352) 



Antennae inserted at distance from eye not more than twice as great as 

 width of frons; beak at most slightly longer than head and prothorax 

 combined 63 



63. Size 2.5 to 3.0 mm.; second tarsal segment as long as wide, not longer than 



lobes of third segment (New Hampshire, Florida, Texas, Wisconsin). 



rostrum Say (p. 384) 



Size generally less than 2.5 mm.; second tarsal segment longer than wide, 



longer than lobes of third segment 64 



64. Head excavated and polished ventrally; elytral striae shallow; mucrones 



minute (Florida; Tamaulipas) gulare Fall (p. 338) 



Head not excavated ventrally; elytral striae deep; mucrones larger. . . 65 



65. Elytra strongly bronzed, intervals polished, nearly impunctate, elytral pubes- 



cence nearly lacking, scales in striae larger than those on intervals (Guate- 

 mala; Honduras; Colombia; Venezuela; Bolivia). 



bicolor Gerstaecker (p. 350) 



Elytra black, not bronzed, intervals with more or less distinct transverse 



minute rugae, intervals with distinct punctures bearing conspicuous scales 



as large as those in striae 66 



