578 U. S. NATIONAL MUSEUM BULLETIN 2 16 



cult Hun in Fairfax Co., Falls Church, Glencarlyn, Great Falls, 

 Nelson Co., Springfield, and Westmoreland State Park in Westmore- 

 land Co.); and West Virginia (Brush Creek). 



Collection dates are mostly from mid-June to early August. The 

 earliest and latest dates of capture are: June 2 at Great Falls, Va.; 

 June 14 at Chain Bridge, Va. ; August 5 at Falls Church, Va. ; August 

 6 at Nelson, Va.; and September 7 at Reisterstown, Md. We have 

 found the species moderately common in rich deciduous woods, 

 especially in river and stream bottoms. 



A female was reared from Strangalina bicolor in Querent, at Spring- 

 field, Va., May 31, 1912, by T. E. Snyder. 



This species is in rich deciduous woods in the Carolinian fauna. 

 Adults occur mostly from mid-June to early August. 



5. Genus Yezoceryx 



Figure 310, a 



Yezoceryx Uchida, 1928, Journ. Fac.Agr. Hokkaido Univ., vol. 25, p. 36. Type: 

 Yezoceryx scutellaris Uchida; original designation. 



Front wing 5 to 11 mm. long; clypeus moderately short to rather 

 long, with a subapical transverse ridge (this ridge obsolescent in the 

 Neartic rupinsulensis) ; exposed portion of labrum about 0.2 to 0.4 

 as long as wide; occipital carina complete; intercubitus opposite 

 second recurrent or basad of it by as much as 0.4 its length; nervellus 

 broken near or a little above the middle; front and middle tarsal 

 claws with an acute accessory tooth near their midlength; hind tarsal 

 claws simple; first sternite fused witli its tergite, without hairs on 

 its swelling, or rarely in extra-limital species with one or a very few 

 hairs; ovipositor apically without transverse ridges or with a very 

 few, fine, widely spaced ridges. 



This is a large genus of the eastern Palaearctic region and the Indo- 

 Australian area. There is a single Nearctic species. It belongs in 

 a species group which has additional representatives in China and 

 Japan. 



1. Yezoceryx rupinsulensis (Cresson) 



Acoenitus rupinsulensis Cresson, 1870, Trans. Amer. Ent. Soc., vol. 3, p. 143; 9. 

 Type: 9, Illinois (Philadelphia). 



Front wing 7.5 to 8.5 mm. long; temple weakly convex; preapical 

 transverse carina of clypeus obsolescent; flagellum thick and short, 

 in female subclavate, its median segments about 0.75 as long as wide, 

 in male more elongate, the median segments about 1.2 as long as 

 wide; propodeum with a tendency to have irregular rugae across the 

 middle which obscure the carinae, the carinae more distinct in the 



