4 PEOCEEDnSTGS OP THE NATIONAL MUSEUM vol.77 



eyes; malar space equal to nearly half the height of eye; face shining, 

 with weak setigerous punctures, and sparsely covered with long pale 

 hairs; frons shining, divided down the middle by a shallow groove, 

 impunctate laterad of the ocelli and narrowly along each side of the 

 groove but with closely set setigerous punctures elsewhere, the punc- 

 tate areas covered with pubescence which is much finer and shorter 

 than the hairs on the face; vertex and temples polished but with 

 vestiture like that on the face; antennae 45- jointed, about two-thirds 

 as long as the body; scape about twice as long as broad, pedicel 

 broader than long; third joint nearly twice as long as broad, the 

 following joints subquadrate. Thorax smooth, polished, and sparsely 

 hairy; mesonotum without trace of parapsidal grooves; transverse 

 groove between scutellum and mesoscutumj narrow and without 

 crenulae; propodeum polished; wings extending beyond apex of 

 abdomen, radial cell short, metacarpus equal to length of stigma 

 and parastigTua together; first abscissa of radius equal to width of 

 stigma, second abscissa fully three times the first and very nearly 

 equal to third abscissa; second cubital cell nearly, parallel sided; re- 

 current nervure interstitial; legs normal, the hind tibiae not thick- 

 ened and without a groove. Abdomen elongate ovate, a little longer 

 than head and thorax, about as broad as thorax ; first tergite a little 

 longer than broad, with a broad rounded elevation in the middle 

 which is bounded on each side by a finely crenulate furrow, the ele- 

 vated portion and the lateral margins polished ; second tergite with a 

 triangular elevated smooth area medially at base and mostly smooth 

 elsewhere, but with a broad rugulose depression on each side of the 

 elevation; suturiform articulation strongly crenulate; a transverse 

 groove on the third tergite and the suture between the third and 

 fourth tergites also crenulate; remainder of abdomen polished; ovi- 

 positor a little longer than the abdomen. Head, antennae, palpi, 

 tegulae, prosternum, mesopleura for the most part, propodeum, all 

 legs, and the ovipositor sheaths black; prothorax except sternum, 

 mesoscutum, scutellum, metanotum, narrow median longditudinal 

 line on propodeum, and the entire abdomen ruf otestaceous ; meso- 

 sternum and metasternum more or less obscure testaceous ; wings uni- 

 formly deep fuscous with a small hyaline spot at junction of recur- 

 rent vein with cubitus ; stigma and veins black. 



Male. — Length, 6 mm. Similar in every way to the female (the 

 antennae are lost) except that the hind tibiae are curiously modified 

 in that they are distinctly though not greatly thickened for nearly 

 their whole length and on the dorsal or posterior side a broad deep 

 groove, resembling a slit made with a knife, extends from the basal 

 one-fourth to the apex. 



Type localities. — Aguascalientes, Mexico. 



Type.— C£it. No. 41098, U.S.N.M. 



