204 



U. S. NATIONAL MUSEUM BULLETIN 216 



of the costula; second lateral area of propodeum with moderately 

 dense hairs over its entire surface; nervulus beyond basal vein by 

 about 0.2 to 0.6 its length; front spur of middle tibia about 0.3 to 

 0.5 as long as hind spur; second segment of middle tarsus about 1.3 

 as long as wide; hind tibia whitish on its basal 0.2 ±, beyond which 

 it is abruptly fulvous or infuscate; first tergite 1.4 to 1.8 as long as 

 width at basal corners; second tergite about 0.75 as long as wide, its 

 punctures rather coarse and strong, rather evenly distributed except 

 that the apical 0.17± of the tergite is almost impunctate and that 

 sometimes the median part of the tergite is more sparsely punctate; 

 epipleurum of third tergite subtrunctate apically, its inner margin 

 rather evenly convex. 



This group contains the two Nearctic species described below and, 

 judging from their descriptions, the European Exochus frontellus 

 Holmgren 1858, E.fletcheri Bridgman 1884, and E. signifrons Thomson 

 1887. We have an undetermined species from Ireland which may 

 be one of the three named European species. 



17. Exochus flavifrontalis Davis 



Figures 179,i; 188,g; 189,e; 192,h 



Exochus flavifrontalis Davis, 1897, Trans. Amer. Ent. Soc, vol. 24, p. 217; d", 



9. Lectotype: 9, Nevada (Philadelphia). 

 Exochus alpinus Cushman, 1922, Proc. U. S. Nat. Mus., vol. 61, art. 8, p. 13; d" 



(name preoccupied by Zetterstedt, 1838; new synonymy). Type: d\ alpine 



region of Mount Washington, N. H. (Washington). 



Front wing 2.7 to 4.2 mm. long; frons swollen medially but without 

 a median carina; nervulus beyond basal vein by about 0.3 its length; 

 second abdominal tergite with rather coarse strong punctures, the 

 interspaces of which are about 0.6 their diameter, the punctures 

 lacking from apical 0.17 of the tergite but otherwise evenly distributed. 



Black. Face and clypeus with a variable amount of pale yellow, in 



Figure 121. — Localities for 

 Exochus flavifrontalis. 



