166 Proceedings of the Biological Society of Washington. 



Female. — Length 2.5 mm. ; mostly black and shining, head rugulose, 

 cheeks and occiput and vertex granular, ocelli equidistant, the lateral 

 ocelli distinctly nearer to each other than to the lateral ocelli, anterior 

 edge of the clypeus with an apparently thin margin, mandibles heavy and 

 stramineous with dark tips, rest of mouth parts stramineous, the palpi 

 somewhat infuscated, maxillary palpi five-jointed, the third joint longest 

 and the end joint shorter than the penultimate joint, pedicel with a 

 stramineous tip, first joint of flagel stramineous at base; thorax granular 

 and reddish except the metathorax and the posterior lower corner of 

 mesopleurae which are blackish, surface of middle third of mesonotum 

 uneven, mesopleurae with shallow, transversely striate sternauli, second 

 abscissa of radius a little longer than the first transverse cubitus, third 

 abscissa of the radius apparently as long as the two preceding abscissae 

 combined, metapleurae cinereous with pubescence, wings tinged with 

 brown, stigma and veins dark brown, legs including coxae and trochan- 

 ters brownish stramineous, tibiae and tarsi dark brown, propodeum with 

 the dorsal aspect divided by a longitudinal carina and rugulose, posterior 

 aspect bounded above by a prominent carina below which are radiating 

 carinae ; first tergite with its basal facet about one-third as wide as the 

 segment is wide at apex, rugulose, second and third tergites granular, 

 separated from each other by an arcuate indistinctly foveolate furrow, 

 third tergite elevated before the apex then sloping to end in a polished 

 edge, fourth, fifth and sixth tergites mostly polished, third tergite appar- 

 ently half as long down the middle as the second, ovipositor barely show- 

 ing beyond the sixth tergite. In one paratopotype the thorax is somewhat 

 blacker than in the type. In another paratopotype the thorax is black 

 excepting the prothorax, which is reddish. 



Three specimens examined. Male unknown. 



Ascogaster erythrothorax new species. 



Type, Cat. No. 20456, U. S. National Museum. Plummers Island, 

 Maryland, June 29, 1913, W. L. McAtee. 



Head, thorax and propodeum reddish brown. 



Female. — Length 4 mm., head dullish, rugulose, cheek nearly twice as 

 broad as the eye, somewhat striate, face dull rugulose, clypeus shining 

 and punctured, its anterior edge subbidentate, scape a little longer than 

 the first joint of the flagel, pedicel nearly as long as wide, mandibles con- 

 colorous with the face, their tips dark, palpi blackish, scape and pedicel 

 more or less dark brownish, first to fourth joints of the flagel brownish 

 stramineous, rest of flagel blackish; thorax dull, reticulate, wings with the 

 basal half including the veins yellowish, the apicel half fuscous, first dis- 

 coidalcell petiolate, tegulae blackish, all femora and fore tibiae dark brown, 

 rest of legs blackish ; propodeum sculptured somewhat like the thorax but 

 more coarsely so, with two blunt equidistant elevations between the lateral 

 prominent, rounded spines that are nearer to the lateral spines than to 

 each other. Abdomen a little more than twice as long as wide in the 

 middle, reticulated, basal sixth brownish stramineous, with a longitudinal 



