MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 253 



in 9 terminating in a 4-joiuted club, the scape slender, pedicel cyatbi- 

 form, first fnniclar joint small; in S with a G-Jointed filiform club, the 

 joints slightly pedicellate, oval, the last long conical; the first fnniclar 

 joint about twice as long as thick, the second stouter, obliquely truncate 

 at tip and curved. 



Thorax short, ovoid, convex; prothorax very short; mesonotuni with 

 distinct but delicate furrows; scutellum convex; nietathorax short. 



Front wings pubescent, ciliated, the subraarginal vein ending in -a 

 knob, the basal nervure distinct, and with a distinct basal cell. 



Abdomen ovate, convex, slightly shorter and narrower than the 

 thorax; first segment small, the second very large, the third and fol- 

 lowing very short. 



Legs clavate, the tibial spurs weak, the basal joint of hind tarsi twice 

 the length of the second. 



The two species in our fauna may be thus distinguished: 



Legs black, the head aud thorax microscopically shagreened. 



First aud second abdoraiual segiueuts not striated, the latter hairy at base. 



M. NiGRlPES Ashni. 

 Legs browuish-yellow, the head aud thorax smooth, impnuctured. 



First abdominal segment aud the second at base striated, not hairy. 



M. CARINATA, sp. UOV. 



Monocrita nigripes Aslim. 

 Bull. \o. 1, Col. Biol. Assoc, p. 8, 1890. 



$ . Length, 1.80""". Black, subopaque, with a fine, granulated, or 

 shagreened sculpture; the face above the insertion of the antenniB 

 with some transverse aciculations. AntenuiB 10-jointed, black, the 

 flagellum about twice the length of the scape, pedicel twice as long as 

 thick, narrowed at base, the second joint minute, the third, slightly 

 swollen outwardly, the following joints very slightly longer than wide, 

 truncate at tips and rounded off at base, or cup-shaped, connected by 

 a very short pedicel. Parapsidal grooves distinct, converging and 

 almost meeting posteriorly. Scutellum high convex, with a deej), 

 transverse depression across the base. Mesopleura smooth, polished, 

 with a curved impression across the disk; metapleura densely covered 

 with a griseous i)ubescence; the metathorax and petiole more sparsely 

 pubescent. Legs black, the knees slightly, anterior legs beneath, and 

 till the tarsi, more or less piceous, or reddish. Abdomen highly polished, 

 oblong oval, as long as the head and thorax together, the petiole not 

 longer than wide, the second segment occupying fully three-fourths of 

 its length, smooth, the following segments exceedingly short and about 

 equal in length. AVings hyaline, pubescent, the submarginal and basal 

 veins distinct, the former knobbed at tip. 



Habitat. — Greeley, Colo. 



Type in Coll. Ashmead. 



"Nothing is known of the habits of this species, which was obtained 

 from H. F. Wickham. 



