08 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



posterior coxa^ above, the middle tibia; above, and the posterior femora 

 and tibia? above, more or less piceous. Antenna* 10- jointed, reacliing 

 to the tij) of m etathorax, incrassated toward tlie tips, tlie terminal 

 joint twice as h)ng as the penultimate; the pedicel stouter but not 

 longer than the first Hagellar .joint, the joints beyond submoniliform. 

 The collar is about one-third the length of the mesonotnm, above 

 finely, transversely ruguh)se; ni.esonotum without furrows; scutellum 

 smooth, i)olished, with a row of punctures surrounding the jxjsterior 

 margin; metathorax finely rugose. Wings hyaline, the veins i)ale, 

 the stigma large, brown, with a pale spot at base, the stigmal vein 

 short. Abdonu'U small, ovate, subpetiohite, smooth and shining, about 

 as h)ng as the thorax, excluding the collar. 



Habitat. — Washington, ]). C. 



Type in Coll. Ashmead. 



Described from a single specimen given to me by E. A. Schwarz. 

 The species is the smallest known, and could easily be mistaken for a 

 small AphelopuH. 



Anteon Popenoei Aslmi. 



Dryinun Popenoei Ashni., Bull. No. 'A, Kaiifs. Exper. Sta., App., j). 1, .Iiiiu', 18^(8. 



^ . Length, 2""". Black ; head subopaque, microscopically punctuate ; 

 thorax and abdomen polished, black; metathorax and nu^soplcura 

 finely rugose; the superior edge of the truncature in the former mar- 

 gined. Clyi)eus anteriorly arcuate, snjooth. Mandibles 4-dentate, i)ale 

 brown. Antenna? 10-Jointed, brown, with sparse, long, white hairs; 

 pedicel small, half the length of the scape; first flagellar joint longer, 

 but shorter than the fourth; fourth joint and those beyond, except the 

 last, nearly equal, about as long as the scape. Wings hyaline, the 

 stignKi large, i)ale-brown, the stigmal vein short. Legs, including coxie, 

 reddish-yellow. 



Habitat. — Riley County, Kansas. 



Type in Kansas State Agricultural (College. 



MYSTROPHORUS Forster. 



Hyiii. Stnd., ii, p. 91 (1856); Kiithe, Borl. Eiit. ZoitN., la'iR, p. 120. 

 (Type M . formicaformis Rtithe.) 



Head large, broad, subquadratc, nearly twice broader tluui the tho- 

 rax, the occiput not emarginate; ocelli 3, triangularly arranged; eyes 

 oval. 



Antenna? in both sexes K^jointed, in 9 subclavate, the pedicel small, 

 the first flagellar joint a little longer and slenderer than the scape, the 

 following .shorter. 



Maxillary ])ali»i 4-jointe(l; labial palpi -jointt'd. v ; ' 



Mandibles truncate at tips, with .'{ nearly equal, acute teeth. 



