280 BULLETIN 15, UNIiED STATES NATIONAL MUSEUM. 



joints cylindrical, less than twice as long as thick, the four terminal 

 joints much thicker and larger, the last being twice as long as tliick, 

 the others a little shorter. 



Theparapsidal grooves are distinct, converging posteriorly ; the middle 

 lo])e thus formed projects slightly on to thescutellum. Scutellum sub- 

 convex. Pleura smooth, polished, the mesopleura with a grooved fur- 

 row extending obliquely to the base of middle coxa' ; metajdeura densely 

 pubescent; tlie petiole and the hind coxa' at base are also slightly 

 pubescent. Legs uniforndy pale brownish-yellow, with all coxic black. 

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

 projecting considerably beyon<l the tips of the wings when fohb'd. 

 Wings hyaline, pubescent. 



The S measures but 2"'". in length; the fac«^ is sculptured as the rest 

 of the body, and the autenuie are a\ holly pale brown: otherwise 

 ^imilfir to the 9 , except the following structural differences: The an- 

 teinue are shorter, the club 0-jointed instead* of 4-joiuted, the pedicel 

 only a little longer than wide; the first joint of tlagellum is small but 

 triangular, the second enlarged, sw<dlen, nearly as broad as long; the 

 following joints, which constitute the club, are narrower and cylin- 

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

 twice as long as the preceding. The abdomen is not much longer than 

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

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



Habitat. — Greeley, roh>. 



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



Obtained tlirough II. F. AVickham. 



Polymecus lugrlfemur Ashm. 

 Ectadiun Higrifmnur Ashiu., l'>ull. No. 1, Col. Hiol. Assoc, p. 10. 



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

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

 about twice as long as thick ; otherwise the joints are similar to paJUpes. 

 All coxa' and femora black, the tibisc and tarsi, reddish; sometimes the 

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

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

 more than twice longer than the head and thoi-ax combined, the petiole 

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

 pubescent as the metapleura. Wings hyaline. 



The i is but 2"" in length, and agrees in color and sculpture with 

 the $ , except that the tibia* and tarsi are darker than in that sex; 

 structurally it is like the S nfpaUipes. 



II Am TAT. — ( Jreely, Colo. 



Types 4 S , 3 S , specimens in C(dl. Ashmead. 



Obtained from Mr. H. F. Wickham. 



