PROC. ENT. SOC. WASH., VOL. 20, NO. 7, OCT., 1918 147 



Rileya tegularis, new species. 



Female. Length 2.2 mm. Head, viewed from above, fully three times 

 as broad as long; middle of face finely sculptured, subopaque; sides of 

 face with fine, close striae, which converge at clypeus, none of the striae 

 extending upward much beyond the base of antennae; antennal groove 

 margined at sides, open above and weakly sculptured within ; rest of head 

 finely rugulosely sculptured, opaque; a delicate but distinct carina sepa- 

 rates the cheeks from the face and extends upward along the posterior 

 eye margin, from which it is narrowly separated, to near the top of the 

 eye where it joins the eye-margin; postocellar line about twice the ocel- 

 locular line; antennal scape not quite reaching the anterior ocellus, slightly 

 thicker at base than apex; pedicel hardly one and one-half times as long 

 as thick; first ring-joint narrower than the other two and approximately 

 half as long as broad; second and third ring-joints strongly transverse; 

 first funicle joint subquadrate, the following funicle joints slightly broader 

 than long; thorax above sculptured like the occiput; dorsal aspect of pro- 

 notum as broad as and a little longer than the mesoscutum, rounded in 

 front, its anterior margin with a very delicate marginal carina laterally 

 but absent medially, the angle between the dorsal and lateral aspects of 

 the pronotum rounded or at least not sharp and not margined; propodeum 

 rugulose with a strong transverse carina which is sharply angulated at 

 the middle, the apex of angle sometimes touching the anterior margin of 

 propodeum; marginal vein about one-half the submarginal and about 

 twice the postmarginal, the stigmal distinctly shorter than the post- 

 marginal, abdomen about equal in length to the head and thorax, robust; 

 first tergite (excluding the very short petiole) smooth, a little broader than 

 long, and semicircular in outline; exposed portion of the second also 

 smooth and not quite half as long as the first; third finely sculptured, its 

 exposed margin about one and one-half .times that of the second; fourth 

 occupying most of the dorsum of abdomen, and distinctly, finely sculp- 

 tured; fifth tergite not longer than the second; and also sculptured; sixth 

 about twice as long as the fifth and similarly sculptured; following tergites 

 very short; tip of ovipositor barely visible from above. Black; antennal 

 flagellum brownish, scape brownish black; spot on mandibles, apices of 

 all femora, base and apex of median and hind tibiae, front tibiae almost 

 entirely, all tarsi with the exception of claws, and the venation pale tes- 

 taceous; median arid hind tibiae broadly dark brownish medially; wings 

 hyaline. 



Mule. Length '2 mm. Agrees with description of female except as 

 follows; antennal pedicel hardly longer than broad; marginal vein a little 

 less than half the submarginal ; abdomen petiolate, the petiole broader 

 than long and distinctly sculptured; first tergite (not counting the petiole) 

 nearly twice as broad us long down the middle, faintly sculptured ; second 

 less than half the length of fir<1. distinctly sculptured; third reaching to 

 the middle of abdomen and distinctly sculptured; about equal to the h'rst 



