18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 69 



what longer titan the third; areolet of fore wing small, triangular, 

 oblique, petiolate; nervulus postfurcal; first abscissa of mediella 

 about equal to the second; nervellus not angled; discoidella only 

 weakly indicated; abdomen about as long as the thorax, entirely 

 smooth and polished; first tergite broadening strongly toward apex, 

 where it is about as broad as long; ovipositor barely exserted. 

 Head and thorax entirely black; all coxae and trochanters black; 

 all femora more or less black basally; middle tibiae blackish apically, 

 hind tibiae black on apical half; wings infumated, the hyaline spots 

 below stigma rather poorly defined; abdomen ferruginous, the first 

 tergite black on basal half or more. 



Male. — Essentially as in the female. 



Type— Cs^i. No. 28694, U.S.N.M. 



Type locality. — Colorado. 



Described from one female and one male labeled "Colo. 1329, 

 C. F. Baker Collection." 



2. CRASSOMICRODUS APICIPENNIS, new species 



Very similar to nigrithorax in habitus, but differing particidarly in 

 having at least the mesonotum and propleur.a testaceous, and in the 

 weaker parapsidal grooves. From medius, which it closely resembles 

 in color, it differs in being considerably smaller and more compact, 

 in the relatively longer spurs of posterior tibiae, and in the extreme 

 apex of anterior wings being hyaline. 



Female. — Length, 5 mm. Face at least twice as broad as long 

 between antennal foramina and base of clypeus; clypeus shining, 

 weakly punctate ; malar space at least half as long as the eye height ; 

 eyes broadly oval, rather strongly convex, a little broader than the 

 temples; temples and cheeks broad, bulging somewhat, smooth and 

 polished; frons and vertex polished; antennae 33-segmented in the 

 type, nearly as long as the body; all the flagellar segments longer 

 than broad; two low rather widely separated tubercles between the 

 antennae; ocell-ocular line nearly three times the diameter of an 

 ocellus; a short rather deep, weakly foveolate groove between lateral 

 ocelU; thorax compact parapsidal grooves present, but very shallow, 

 weakly foveolate posteriorly; scutellum about as long as broad, pol- 

 ished; furrow in front of scutellum usually with four distinct pits; 

 mesopleural furrow a little curved, foveolate; propodeum evenly 

 declivous from base to apex, not rounded, rugulose; propodeal spi- 

 racle short oval; metapleura punctate, rugulose below; posterior 

 coxae polished; inner spur of hind ti])iae distinctly more than half 

 as long as the basitarsus ; last segment of liind tarsi somewhat longer 

 than the third; areolet of fore wing small triangular, oblique, petio- 

 late; stigma not three times as long as broad; radius arising only 

 a little beyond middle of stigma; first abscissa of mediella about 



