PROC. ENT. SOC. WASH., VOL. 20, NO. 7, OCT., 1918 137 



scutum with delicate but complete parapsidal grooves ; scutellum 

 carinately margined at apex; thorax above rugulose or shagreened, 

 never umbilicately punctate; propodeum short, narrowed at apex 

 into a short neck, and usually with a more or less distinct trans- 

 verse carina a little before the middle; marginal vein slender and 

 approximately half as long as the submarginal ; front coxae with a 

 more or less distinct fovea beneath a little before the middle ; first 

 joint of all tarsi short, rarely longer than the second joint; abdo- 

 men subsessile in the female, petiolate in the male, rather robust, 

 more or less conic-ovate, as long or a little longer than the ho; id 

 and thorax, the ovipositor barely exposed at tip. 



Key to Species of Rileya 

 Females 



1. Yellowish or testaceous species, sometimes more or less brownish 



above 2 



Black species, in only -the species orbitalis conspicuously marked 

 with yellowish 8 



2. Stigmal vein ending in a large rounded knob megastigma Ashmead 



Stigmal vein ending in a small knob, normal 3 



3. General color yellowish-white; praescutum, parapsides discally, 



median stripe on scutellum, propodeum, pleural sutures, border 

 of hind coxae, petiole, and a broad stripe above and below on 

 abdomen, brownish; pronotum entirely yellowish; face with a^ 



median brownish stripe collaris Howard. 



General color not yellowish-white, or if so, the pronotum is not 

 entirely yellowish and the face is without a median brownish 

 stripe 4 



4. Third tergite (not counting the petiole) much the largest one; 



abdomen with but two small disc-like tergites at base 5 



Fourth visible tergite the largest; abdomen with three small 



tergites basally 6 



.3. Head, viewed from in front, forming a nearly equilateral triangle; 

 malar space, in profile, nearly straight, as long as the eye and 

 without a carina separating checks from face; head, thorax, and 

 abdomen above dark brown; face orbits, cheeks, three longi- 

 tudinal spots above and sides of pronotum, spot on inner mar- 

 gin of parapsides, spot on axillae, lateral margins and apex <>!' 

 scutellum, large spot on sides of third tergite, and legs, yellow- 

 ish-white pulclini Aslnnead 



Head, viewed from in front, broader than long; malar space, in 

 profile, convexly rounded, shorter than the eye. with a distinct 

 carina separating cheeks from face; color uniformly dark red- 

 dish testaceous hctcrot/uxlcr n. sp. 



