BIOLOGICAL PAPERS. ' 271 



abcipsa of the cubitus about as long aa the petiole of the first diecoidal cell. 

 Abdomen with the first segment shining, rugulose, the rugfe not very elevated, a 

 linear ridge on each side of the basal segment, the remaining segments polished ; 

 the second segment with an apparently semilunar impression on each side of a 

 medial raised portion at the extreme base of the segment; the ovipositor would 

 apparently not extend beyond the tip of the abdomen. Black; clypeus and 

 mandibles except at tips castaneous; scape and pedicellum brownish, inclining 

 to testaceous; legs testaceous, apical tarsal joint and claws dark brown; tegulie 

 and tubercles testaceous to brownish, first segment of the abdomen black, except- 

 ing the lateral margins which, like the remainder of the abdomen, are brown, the 

 dorsum of abdomen is stained with black in the middle ; sheath of ovipositor 

 brownish testaceous. Very thinly pubescent with whitish, fine hairs, most 

 abundant on the face and metanotum. 



Type: University of Kansas. Type locality : Douglas county, Kansas. One 

 specimen, July, E. S. Tucker. 



Opius aberrans, n. sp. 



Opius with the venation not quite typical. 



Female. — Length, 3 mm. Head polished; cheeks, vertex and occiput ap- 

 parently without sculpture of any kind ; face minutely, sparsely punctured ; cly- 

 peus more distinctly closely punctured; mandibles not fitting closely to the 

 anterior edge of the clypeus; antencaj twenty-eight jointed; scape a little longer 

 than the first joint of the flagellum. Thorax polished, dorsulum with the par- 

 apsidal grooves abbreviated, represented anteriorly only by dimples or very short 

 foveae; scutellum elevated, smooth, and polished, mesopleura with a rather dis- 

 tinct oval rugulose impression; metanotum dullish, rather uniformly finely ru- 

 gulose; the metapleura somewhat roughened, nearly smooth; wings pale, tinted 

 with blackish, first abcissa of the radius about as long as the second abcissa of 

 the cubitus, the second abcissa of the radius nearly as long as the first and sec- 

 ond transverse cubiti combined, petiole of the first discoidal cell a little longer 

 than the transverse median nervure, the first abcissa of the subdiscoidal nervure 

 distinctly shorter than the petiole of the second cubital cell. First abdominal 

 segment finely longitudinally rugulose, almost striate, remaining segments highly 

 polished and smooth. The second segment has two dimples or impressions on 

 each side of the middle of the base. Black; head except the occipital region and 

 a large spot on vertex and front encircling the ocelli yellowish brown, cheeks 

 brownish, scape and pedicellum brownish; tegulae testaceous; legs testaceous, 

 apical tarsal joints and claws brown; abdomen brownish testaceous, basal two- 

 thirds of basal segment and apical third of the abdomen black, the black of th& 

 apical third of the abdomen extending along the sides to the middle. The 

 pubescence is very thin and whitish, most abundant on the face and metathorax, 

 but sparse even in those places. 



Type: University of Kansas. Type locality : Douglas county, Kansas. Au- 

 gust, E. S. Tucker. 



Paratype, same place and date, has the abdomen blacker. 



Opius luteiceps, n. sp. 



Congeneric with O. aberrans. 



Male. Length, 2.5 mm. Face shining, distictly punctured on the lower por- 

 tion of the inner orbital margin; clypeus distinctly punctured; vertex, occiput 

 and cheeks highly polished, apparently impunctate; antencee twenty eight 

 jointed, the scape a little longer than the first joint of the flagellum. Thorax 

 polished, sculptured nearly as in the preceding species, the pleural impression^ 



