42 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



propodeum more or less black or blackish; rarely the thorax is 

 entirely testaceous ; the duskiness or blackish coloring of propodeum 

 usually restricted to the basal two-thirds, rarely covering entire pro- 

 podum; wings infumated; legs usually black, often more or less 

 varied with ferruginous, and in all the specimens examined the 

 anterior femora are pale toward the apex, even when the legs are 

 otherwise completely black; abdomen ferruginous. 



The following material was studied and served as a basis for the 

 above notes: The types of nigripes and wyomingensis, which are from 

 Colorado and Wyoming, respectively; one specimen, in the collection 

 of the Boston Society of Natural History, from Cohasset, Massachu- 

 setts; and 21 specimens, in the United States National Museum, 

 which are from Colorado, Nevada, Washington, Oregon, California, 

 New Mexico, Arizona, Kansas, and Rhode Island. 



15. BASSL'S BAKERI, new species 



Most similar to 'perforator, but distinguished by the nearly hyaline 

 wings, the much smoother propodeum, and the completely polished 

 abdomen. 



Female. — Length, 5 mm. Face subrostriform, smooth and shin- 

 ing; the malar space about three-fourths the eye height; clypeus 

 strongly convex; third segment of labial palpi not greatly reduced, 

 nearly as long as the second; frons polished, immargined; ocell-ocular 

 line twice as long as the diameter of an ocellus; antennae slender, 

 those of the type 25-segmented, the 10 apical segments quadrate, not 

 longer than broad; mesoscutum smooth and polished; parapsidal 

 furrows feebly indicated; furrow in front of scutellum deep, polished, 

 divided into two pits by a median septum; mesopleural furrow very 

 shallowly impressed, short, polished; mctapleura mostly smooth, 

 roughened only below; propodeum mostly smooth, not areolated, but 

 with a short basal median carina which divides to form a broad are- 

 ola that is open behind; petiolarea and lateral areas not at all defined; 

 propodeum rounded anter-posteriorly; propodeal spiracles short oval; 

 coxae polished; spurs of hind tibiae of a])parently equal length and 

 less than half as long as the basitarsus; apical segment of posterior 

 tarsi about as long as the third; radius arising from the middle of the 

 stigma; first abscissa of radius very short; first abscissa of mediella 

 indistinctly shorter than the second; discoidella not distinct; abdo- 

 men about as long as the head and thorax combined; first tergite nar- 

 row at base, longer than broad at apex, and completely polished, with 

 two short dorsal longitudinal keels that do not extend quite to the 

 middle of the tergite; second tergite with a dehcate, smooth, trans- 

 verse furrow; suture between second and third tergites smooth; ovi- 

 positor sheaths as long as the body. Head and thorax entirely black ; 

 all coxae and trochanters, anterior femora ])asally, and the middle 



