14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



small, stout spines just above apex on the outer side; posterior meta- 

 tarsus a little incrassate; radius arising from about the middle of 

 stigma; areolet subtriangular, rather large, subpetiolate, slightly ob- 

 lique; abdomen stout, about as long as the thorax, completely 

 polished; first tergite about as broad at apex as long, without dorsal 

 keels or other elevations; ovipositor sheaths about as long as the 

 abdomen; ovipositor decurved at tip. Head, thorax, and abdomen 

 ferrugino-testaceous; prepectus and coxal cavities usually black: 

 antennae yellow on basal third, blackish beyond; legs concolorous 

 with the body; wings hyaline on basal half, contrastingly dusky 

 apically over an area comprised of the third cubital, second discoidal, 

 and second brachial cells; abdomen sometimes more or less brownish 

 apically. 



Type.— Cat. No. 28693, U.S.N.M. 



Type locality. — Mesilla, New Mexico. 



Described from two female specimens collected by T. D. A. Cock- 

 erell. In the United States National Museum there are seven addi- 

 tional specimens, not included in the type series. These are from 

 San Diego, CostuUa, Brownsville, and Brewster County, Texas; and 

 Las Cruces, New Mexico. 



2. AGATHIRSIA NIGRICAUDA (Viereck) 



Crassomicrodus nigricaudus ViEREriK, Trans. Kans. Acad. Sci., vol. 19, 1905, p, 

 288. 



Type. — In the University of Kansas collection. 



Very similar to thoracica, but readily separated by the color char- 

 acters given in the key. Thorax black except the upper margin of 

 propleura and the mesoscutum, which are ferruginous ; legs uniformly 

 brownish yellow, with only the anterior and middle coxae and more 

 or less of posterior coxae black; first, second, and basal half of third 

 tergites ferruginous; remainder of abdomen entirely black; wings 

 yellow, infuscated at apex, the infuscated area covering third cubital, 

 second discoidal, and second brachial cells. Face with long sericeous 

 pubescence, not convex, but rather weakly broadly impressed on 

 either side of the middle line ; malar space not half as long as the eye 

 and hardly as long as second flagellar segment; antennae usually 30 

 to 33 segmented; temples and cheeks broad, swollen; propodeum 

 coarsely rugose and provided with long sericeous pile ; inner spur of 

 hind tibia less than half the ])asitarsus. Posterior basitarsus incras- 

 • sate, but not as broad as in thoracica; ovipositor sheaths a little longer 

 than in that species, and somewhat shorter than in testacea, about 

 as long as the abdomen beyond first segment. 



The United States National Museum has four specimens of this 

 species which are from Colorado and New Mexico. 



