56 PSYCHE [Jime 



Eyes dark reddish. Scutellum, lateral margins of mesoscutum, and vertex conspicu- 

 ously pale cadmium yellow. Otherwise as in female, with the exception of antennal 

 and abdominal characters. Abdomen more cylindrical. 



Antennpe more uniform. Scape and pedicel as in the female, but shorter. 

 Scape not exceeding the combined length of the three following joints; pedicel still 

 longer than wide, but distinctly shorter than funicle 1, not more than two-thirds its 

 length; funicle uniform, the joints all subequal in length and width; funicle 1, 

 however, shorter than the others; funicle joints cylindrical, subtruncate at ends, and 

 well separated; in balsam mounts apparently hairless, and with two distinct spines 

 arising, one from each side of the apical ends of the flagellar joints (also present in 

 female, but smaller); club 2-jointed, the basal joint stout, subequal to funicle 4,. 

 and one-third longer than the apical joint, which is pointed conical and narrower. 

 Flagellum with at least several distinct longitudinal carinte, the pedicel with faint 

 longitudinal striations. 



Genitalia not exserted, excepting in balsam mounts; they are long and slender. 



[Described from 14 specimens.] 



To the naked eye, the females are yellow or dusky yellow, and the males 

 appear to be black. The males are very beautiful. 



Seen through a hand lens (Coddington, ^ inch), the female is pale cadmium 

 yellow, with a few dusky spots on sides of the thorax, the antennjie dusky yellow, the 

 eyes blue green, ocelli apparently red, wings opalescent, their basal halves dusky, 

 and the basal half of the abdomen conspicuously blackish. The male is very dark, 

 the yellow scutellum, dark venation and eyes, black axillae, ocellar area, and meso- 

 scutellar area, being characteristic. 



When mounted in balsam, some of the structures and colors are obscured, and 

 in many cases it is difficult to make them out correctly. I believe, therefore, that, 

 if possible, these minute parasitic Hymenoptera should be described from unprepared 

 specimens, and as soon after death as possible. The eyes of the females become 

 dark reddish several days after death. In balsam movmts the base of the marginal 

 vein in this species is transparent, the eyes apparently spotted with black and some- 

 times dark throughout, venational and antennal characters variable and often ob- 

 scured, the abdominal segments pressed out of their normal positions, and the 

 genitalia out of theirs. 



Described from 77 females and 14 males, first reared by Mr. John J. Davis, 

 March 4, 1908, from Aleyrodes vaporariorum Westwood in the fourth postembryonic 

 instar, on Salvia, pansy-geranium and other flowers in the greenhouse of the Uni- 

 versity of Illinois, Urbana, Illinois. Subsequently reared in large numbers from 

 the same hosts March 7 to 31st, 1908. 



