454 U. S. NATIONAL MUSEUM BULLETIN 216 



20. Punctures near middle of hind side of hind femur moderately dense, most 



of them separated by about 1.5 their diameter; range: Rocky Mts. and 



westward 21 



Punctures near middle of hind side of hind femur sparse, most of them 

 separated by about 3.0 to 5.0 their diameter; range: Atlantic coast to 

 Pacific 22 



21. Metapleurum with coarse, strong wrinkles; lower part of trough of pronotum 



with long horizontal wrinkles 14. sierrae, new species 



Metapleurum with weak, rather fine wrinkles or almost smooth; lower part 

 of trough of pronotum smooth or with short horizontal wrinkles. 



15. parvum, new species 



22. Trough of pronotum with a series of cross ridges; punctures near middle of 



front side of hind femur separated by about 2.0 their diameter; range: 



west of Rocky Mountains 17. dichrous (Rohwer), in part 



Trough of pronotum without cross ridges; punctures near middle of front side 

 of hind femur separated by about 3.0 their diameter; range: Atlantic to 

 Rocky Mountains 23 



23. Apical 0.15 of hind femur infuscate; mesepimeron with about 15 hairs on its 



lower half, these not restricted to the hind margin; basal 0.15± of second 



tergite with rather strong wrinkling 20. albotibiale (Bradley) 



Apex of hind femur not distinctly infuscate; mesepimeron with to about 6 

 hairs on its lower half, these restricted to its hind margin; basal 0.1± of 

 second tergite with rather weak wrinkling . . 21. ochropus, new species 



I. CILIPES GROUP 



Body form unusually long and depressed; metapleurum and pro- 

 podeum with coarse, close punctures, sometimes a little rugose between 

 the punctures; middle tibia simple, without an oblique groove on its 

 posteroventral side; tibiae and tarsi of female with more or less 

 conspicuous long erect or suberect hairs, in addition to the usual 

 clothing hairs; tibiae and tarsi of male usually with inconspicuous 

 moderately long hairs, in addition to the regular clothing hairs; 

 hind femur in profile with a longitudinal carina with convex outline 

 just distad of its ventral tooth; tooth on hind femur 0.5 to 2.0 as high 

 as its basal width; wings always fully developed; intercubitus varying 

 from 0.5 as long as second abscissa of cubitus to absent because of 

 approximation of cubital and radial veins; ramellus short or absent; 

 first tergite unusually long and slender, with some rather coarse punc- 

 tures and often some weak striation. 



This group includes the two Nearctic species below, the European 

 Odontomerus thomsoni Clement 1938 and O. quercinus Thomson 1877, 

 and an undetermined species from Japan. Judging from the descrip- 

 tion, the Japanese Odontomerus jezoensis Uchida 1928 belongs here 

 also. 



1. Odontocolon cilipes, new species 



Male: Unknown. 



Female type: Front wing 10.8 mm. long; punctures on upper half 

 of front side of hind femur separated by about 1.5 their diameter; 



