1915] North American Pachygasterine 319 
margins of face with distinct silvery pile; proboscis yellowish apically, 
brown basally. Mesonotum with silvery hairs which are very dense, 
backwardly directed, and decumbent; pleure with a vertical stripe of 
silvery hairs on center; scutellum with less conspicuous hairs than 
mesonotum. Abdomen with short whitish hairs, which are much more 
sparse than those on thorax. Legs yellow, cox, except at apices, and 
femora, except at bases and apices, blackish brown. Wings clear, veins 
yellowish. Halteres yellow, knobs white. 
Frons about a fifth the width of the head, parallel-sided from 
posterior ocelli to a short distance above antennz, where it widens 
gradually; ocelli situated on a slight prominence; antennez small, third 
joint disclike, the glossy area on inner side very noticeable; arista 
slender, bare, apical; eyes bare. Thorax with distinct suture on each 
side at middle, the portions immediately posterior to suture distinctly 
swollen; process in front of wing-base distinct; scutellum directed 
slightly upward, blunt apically, and unarmed. Abdomen broader than 
long, segments poorly defined; hypopygium small, generally protruded. 
Legs slender, tarsi not thickened. Apex of discal cell slightly proximate 
of apex of stigma, distance from fork of third vein to apex of latter about 
equal to preceding section of costa. 
Female.—Differs from the male in having the frons slightly wider, 
the antennze appreciably larger, profile (as in Fig. 16), the thoracic 
dorsal pilosity shorter and brassy in color, except anteriorly on the 
sides, and in being slightly larger. 
Length, male, 2-2.5 mm.; female, 2.5-3.5 mm. 
Originally described by Hine from Onaga, Kansas, and 
doubtfully referred to Pachygaster. I have examined one of the 
paratypes. I have seen examples from Havana, IIl., taken on 
the Illinois River bottoms June 19, 1909; from Plainview, IIL., 
in apple orchard, May 3, 1915 (J. R. Malloch); from Lafayette, 
Ind., June 6 and July 24 and 26 (J. M. Aldrich); from Ithaca, 
N. Y., July 15, 1907 (A. D. MacGillivray) ; from Lincoln, Neb., 
marked “bred from Pulvinaria innumerabilis;’’ and five speci- 
mens from the series of Pachygaster pulcher in the Museum of 
Comparative Zoology at Cambridge, Mass., two females of 
which bear the label D. C., one labeled ‘‘ Loew coll.,’’ the other, 
“pulcher’’ and ‘‘O. Sacken,’’ and two males and one female 
without locality labels, one bearing the number 77, and all 
three with the label ‘‘ Loew coll.”’ 
As pointed out by Aldrich in his “Catalogue of North 
American Diptera’’ (p. 192), Loew had two species before him 
when he described Pachygaster pulcher—a fact which invalidates 
his description of the female. The description of the male 
was drawn from the specimen bearing the type label, and this 
