SUBGENUS TRICHAPION — KISSINGER 255 



31. Size about 1.6 mm.; metasternum comparatively coarsely, sparsely punc- 



tured; tibial mucrones fine, curved (Pueblo, M6xico, Distrito Federal). 



parcum, new species (p. 305) 



Size about 2.0 mm.; metasternum comparatively finely, densely punctured; 



tibial mucrones stouter 32 



32. Elytra not aeneous, pubescence nearly white; antennal club nearly three times 



as long as wide, covered with very sparse, long, suberect setae and shorter, 

 more abundant, decumbent setae (Arizona, New Mexico). 



orioles, new species (p. 304) 

 Elytra moderately aeneous, pubescence on dorsal surface with faint yellowish 

 cast, white laterally; antennal club slightly more than twice as long as 

 wide, covered with nearly uniform, long, suberect setae (New York- 

 Florida, Alabama) griseum Smith (p. 300) 



33. Antennae inserted at distance from eye less than width of frons; dorsal 



pubescence squamiform (Texas, Mexico) . . propinquicome Fall (p. 277) 

 Antennae inserted at distance from eye not less than width of frons . . 34 



34. Prothorax much wider at middle than base, sides greatly rounded ... 35 

 Prothorax at middle at most slightly wider than base, sides not greatly 



rounded 36 



35. Elytral intervals strongly convex; tibia 1 dilated, curved, bearing long, 



yellowish pubescence on inner surface (Puebia, Distrito Federal, Micho- 



acdn, Guerrero) heterogeneum Sharp (p. 372) 



Elytral intervals slightly convex; tarsus 1 dilated (New Hampshire-Georgia, 

 Louisiana, Iowa, Wisconsin) nigrum Herbst (p. 376) 



36. Antennae inserted at about the middle of the beak, scape longer than next 



five antennal segments (Chile) .... meorrhynchum Philippi (p. 275) 

 Antennae inserted distinctly behind middle of beak 37 



37. Antennae inserted at distance from eye equal to or sUghtly greater than 



width of frons 38 



Antennae inserted at distance from eye distinctly greater (one-third or more) 

 than width of frons 61 



38. Pubescence of dorsal surface generally scant, elytral intervals with one row 



of fine scales 39 



Pubescence of dorsal surface conspicuous, elytral intervals with two rows of 

 fine scales 57 



39. Mucrones dentate 40 



Mucrones simple, at most subangulate ventrally 46 



40. Frons about as wide as dorsal tip of beak, appearing trisulcate; prothorax 



basal margin strongly expanded (?Arizona) . . . grossulum Fall (p. 269) 



Frons wider than dorsal tip of beak (or elytra red), not trisulcate; prothorax 



basal margin at most sUghtly expanded 41 



41. Elytra red, prothorax black 42 



Elytra and prothorax black 43 



42. Beak as long as head and prothorax combined; prothorax finely punctured, 



nearly glabrous; dorsal surface of elytra not at all striate; prothorax not 

 constricted apically (Veracruz, Tabasco, Guerrero; British Honduras; 

 Guatemala; Nicaragua; Panama; Colombia; Venezuela; Brazil). 



rufipenne Gyllenhal (p. 346) 



Beak shorter than head and prothorax combined; prothorax with rather 



coarse, deep punctures which bear hairlike setae; striae adjacent to suture 



distinctly impressed throughout; prothorax distinctly constricted at apex 



(Tamaulipas, San Luis PotosI) evustum, new species (p. 337) 



