ART. 4. NEW PARASITIC HYMENOPTERA — GAHAN. 15 



one and one-half times as long as thick; second, third, and fourth 

 joints subequal and each slightly more than twice as long as thick; 

 club 2-jointed, the joints subequal and each about as long as the 

 fourth funicle joint; occiput distinctly sculptured and the vertex 

 more finely so; mesoscutum, scutellum, and axillae, when viewed 

 through a binocular microscope, with distinct, fine, nearly granular 

 sculpture (mounted in balsam and under a compound microscope 

 this sculpture is seen to be a line reticulation, the enclosed areas on 

 the middle of the scutellum compressed from the sides and forming 

 elongate longitudinally arranged cells, while elsewhere on the scu- 

 tellum, as well as on the mesoscutum and axillae, the enclosed areas 

 are irregular and not especially compressed) ; forewings with the 

 discal ciliation nearly uniform over the whole surface except caudad 

 of the submarginal vein where they are for the most part bare; 

 marginal cilia longest at the posterior apical border of the wing; 

 marginal vein a little longer than the submarginal, the stigmal 

 strongly curved; middle tibial spur about half as long as the basal 

 joint of tarsus; middle tarsi 4-jointed, the fourth and fifth joints 

 connate but with a slight constriction, indicating the original separa- 

 tion ; abdomen a little longer than the thorax ; rounded at apex, and 

 apparently sculptureless; ovipositor slightly extruded. Antennae, 

 legs, and abdomen pale yellow or nearly white, the antennae very 

 slightly inf uscated ; face, cheeks, and posterior orbits black ; f rons, 

 more or less of the vertex, and the occiput above very dark orange 

 yellow or brownish; thorax dull black, with the groove separating 

 axillae from mesoscutum faintly brownish; wings hyaline, venation 

 fuscous ; hind coxae blackish at base. 



Male. — Length 0.6 mm. Antennal pedicel not much longer than 

 broad, much shorter than the first funicle joint which is more than 

 twice as long as thick, about as long as the second funicle joint and 

 somewhat thicker; second, third, and fourth funicle joints and the 

 basal joint of club subequal in length and breadth, about three and 

 one-half times as long as thick; apical joint somewhat shorter; all 

 funicle and club joints with distinct, widely separated, longitudinal 

 striae; structure and sculpture otherwise like the female. Head 

 mostly brownish yellow, darker on the cheeks and below the an- 

 tennae; thorax blackish with the mesonotal grooves pale yellowish 

 and the abdomen mostly blackish with sutures somewhat yellowish; 

 antennae and legs as in the female. 

 Type-locality. — Twin Falls, Idaho, 

 r^/pe.— Cat.No. 26180, U.S.N.M. 



Described from five females and one male mounted on a single 



slide and received from Ralph H. Smith who is authority for the 



statement that they are parasitic upon Aleurodidae infesting the 



leaves of the house geranium; also four females received from A. 



45554— 25— Proc.N.M.vol.65 5 



