OF WASHINGTON. 83 



three-sided emargination in the head. .AgalUaphagus, n. gen. 

 Type of genus, Halictophagus amcricanus Perkins, 1905, para- 

 sitic on Agallia quadrinotata, Ohio. 



2. Mandibles prominent, toothed; thorax shorter than head, ventral slit 



turned posteriorly at sides Dioxoccra, n. gen. 



Mandibles mere lobes 3 



3. Thorax shorter than head, rather suddenly narrowed to base; sides 



of head oblique Pentoxoccra, n. gen. 



Thorax longer than head, gradually narrowed to base ; sides of head 



convex Megalechthrus Perkins, 1905. 



Type of genus Megalechthrus tryoni Perkins, 1905, parasitic on 

 Platyhrachys? sp., Queensland. 



Superfamily Elenchoidea Pierce. 



Head trilobed, mouth seemingly on an elevation ; transverse slit narrow, 



Deinclenchus Perkins. 



Head presenting two obsolete areas; transverse slit very broad, deeply 

 cutting a rounded emargination into the thorax; a thin curtain over- 

 hanging cavity at base Mecynocera, n. gen. 



DESCRIPTIONS OF NEW SPECIES. 



Apractel3rtra schwarzi, n. sp. 



c?. — Length, 1.66 mm.; wing expanse, 4 mm. 



Black, with whitish pubescence. Wings milky, very pubescent. Last 

 ventral segment brownish; oedeagus yellow. Under parts lighter. 



Genitalia consisting of tenth segment overlapping the trough-like 

 cavity of the ninth segment, which is bounded by the flap-like edges 

 of the last ventral segment and apically terminated by a short oedeagus. 

 In the type specimen the oedeagus is not reflexed and shielded by the 

 tenth segment, but is directed backward ; the sinuation is slight until 

 about the posterior one-fifth, where the tube is abruptly turned down- 

 ward; the apex is abruptly acute. 



Type. — No. 9827, U. S. National Museum. Two specimens. 



Eupathocera lugubris, n. sp. 



At present the only description which can be given this spe- 

 cies is included in the generic table. 



It is a parasite of Sphcx {AuimophiJa) fragilis Sm., and was 

 bred by Charles Dury at Cincinnati, Ohio, September 3 and 

 October 2. The host defines the parasite. 



Ophthalmochlus duryi, n. sp. 



At present the only description which can be given this spe- 

 cies is included in the generic table. 



