162 PROC. ENT. SOC. WASH., VOL. 21, NO. 7, OCT., 1919 



continental North America while types of the other two species 

 are from Trinidad, British West Indies. In order to indicate 

 relationship and facilitate identification, the place at which each 

 species runs out in the writer's previously published key to the 

 North American species of the genus Opius (Proc. U. S. Nat. 

 Mus., vol. 49, 1915, pp. 68-72) is given at the beginning of each 

 description. 



Opius cupidus, new species. 



In the writer's key to species of Opius (I. c.) this species runs to 

 category 24 and agrees best with the first alternate of that couplet. 

 It is at once distinguished from provancheri Dalla Torre, how- 

 ever, by the fact that the recurrent nervure is interstitial with 

 first intercubitus instead of joining the second cubital cell; and 

 also by the fact that the thorax, with the exception of the meso- 

 sternum and propodeum, is reddish testaceous like the head. 

 Resembles canaliculatus Gahan, but differs in that the median 

 impression on the mesoscutum is not nearly so elongate, the pro- 

 podeum lacks the transverse carina near base, and the first ter- 

 gite is different. 



Female. Length 3 mm. Head viewed from above more than twice as 

 broad as long; ocellocular line more than three tirnes the length of the greatest 

 diameter of an ocellus; vertex and frons polished; face polished, moderately 

 hairy, with weak setigerous punctures and a distinct median ridge; malar 

 space about equal to the width of mandible at base; clypeus with sparse, 

 irregular punctures and separated from the mandibles by a narrow trans- 

 verse opening; eyes ovate, moderate in size, and broader than the posterior 

 orbits; antennae inserted opposite the middle of the eyes, 34-jointed in the 

 type, the first two flagellar joints subequal and approximately two and one- 

 half times as long as thick, following joints shorter but all distinctly longer 

 than broad. Thorax polished, very sparsely hairy, the mesoscutum and 

 scutellum mostly bare above, the former with a few pale hairs on the an- 

 terior portion and a very few posteriorly on each side of the short, elliptical 

 median depression; parapsidal grooves foveolate and deeply impressed at 

 the anterior lateral angles of the mesoscutum, entirely effaced on the pos- 

 terior two-thirds of the mesoscutum; transverse groove separating the scu- 

 tellum from mesoscutum broad, deep, and strongly crenulate; mesopleura 

 with a broad and strongly crenulate longitudinal depression below the mid- 

 dle; propodeum irregularly rugoso-punctate, with an incomplete and poorly 

 defined median longitudinal carina basally; wings with the stigma broad; 

 first radial abscissa about equal to one-half the width of stigma, second 

 abscissa approximately one and one-fourth times the length of the first inter- 

 cubitus; radial cell rather broad and terminating some distance before extreme 

 wing-apex; recurrent nervure exactly interstitial; first brachial cell closed 



