280 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



joints cyliudiical, less tlian twice as loug as thick, the four terminal 

 joints much thickei- and larger, Uut last being twice as loug as tliick, 

 the others a little shorter. 



Theparapsidal grooves are distinct, converging iwsteriorl}' ; the middle 

 lobe thus formed projects slightly on to thescutellum. Scutellum sub- 

 convex. Pleura snu)oth, polished, tlie mesopleura with a grooved fur- 

 row extending obliquely to the base of middle coxje ; metapleura densely 

 pubescent; the petiole and the hind coxae at base are also slightly 

 pubescent. Legs uniformly pale brownish-yellow, with all coxie black. 

 Abdomen about twice as long as the head and thorax together, and 

 projecting considerably beyon<l the tips of the wings when folded. 

 Wings hyaline, pubescent. 



The S measures birt 2""". in length; the face is sculptured as the rest 

 of the body, and the antenuai are Avholly pale brown; otherwise 

 similar to the 9 , except the following structural difl'erences: The an- 

 tennae are shorter, the club 6-jointe<l instead of 4-jointed, the pedicel 

 only a little longer than wide; the tirst joint of Hagellum is small but 

 triangular, the SQcond enlarged, swollen, nearly as broad as long; the 

 following G joints, which consti-tute the club, are narrower and cylin- 

 drical, the first the shortest , the terminal one the longest, being about 

 twice as long as the i)receding. The abdomen is not much longer than 

 the head and tliorax together, and the wings, when folded, project be- 

 yond its tip. It might easily be mistaken for a genuine Platygaster. 



Habitat. — Greeley, Colo. 



Types 5 9,3 $ specimens in Coll. Ashmead. 



Obtained through H. F. Wickham. 



Polymecus nigrifemur Ashm. 

 Ectudius )ii;/rift»nHr Ashm., Hull. No. 1, Col. liiol. Assoc, p. 10. 



9. Length, 3 to 3.2""". Black; sculptured as in previous species, 

 except that the face is not so smooth. Antennie wholly black, the pedicel 

 about twic&as long as thick ; otherwise the joints are similar to paJlipcs. 

 All coxie and femora black, the tibite and tarsi, reddish ; sometimes the 

 anterior femora are also red, but usually they are piceous or obscured 

 above; the tibia', too, are sometimes more or less dusky. Abdomen 

 more than twice longer than the head and tliorax (combined, the petiole 

 being more pubescent than usual, the sides being almost as densely 

 pubescent as the metapleura. Wings hyaline. 



Tlie $ is but 2""" in length, and agrees in color and sculptui'e with 

 the 9 , excei)t that the tibife and tarsi are darker than i!i that sex; 

 structurally it is like the $ of pnllipes. 



11 AEI'J'AT. — ( Jreely, Colo. 



Types 4 9.3 5 , specimens ni Coll. Ashmead. 



Obtained iVom Mr. II. F. Wickham. 



