DIPTEROUS PARASITES. 1921 



Exorista scudderi, n. sp. PI. «'.», fig. 20. 



Male. — Face in ground-color yellow, with silvery white, vari.able sheen; the cheeks, 

 except the narrow orbital margin are blue black, and but thinly dusted; there are but 

 three or four small bristly hairs above the vibrissal bristle. Palpi reddish yellow. An- 

 tennae black, the third joint largely red at the base on the under side; third joint not 

 broad, of equal width, truncate at the tip, scarcely twice the length of the rather long 

 second joint. Front narrowed above, the sides in ground color black, with grayish or 

 slightly yellowish pollen ; median stripe broad, nearly twice as broad as the sides, in color 

 reddish brown ; the single row of bristles on each side of the front reaches to nearly oppo- 

 site the base of the third antennal joint, the bristles themselves are thin and slender, 

 scarcely differentiated in size from the vertical ones ; the vertical bristles are arranged 

 as inE. hirsuta, that is, with three pairs on tlie margin and one pair in front of the ocelli. 

 The shining black ground color of the mesouotura leaves four broad and distinct gray 

 poUinose stripes. Scuteltum wholly black, thinly poUinose ; its margin on each side with 

 three bristles, and its apex with two small approximate ones. Abdomen black, the sec- 

 ond and third segments apparently with variable poUinose hands ; first segment with a 

 posterior pair of bristles; second segment with a median and a posterior pair; third 

 with a median pair and a posterior row ; bristly hairs of abdomen rather long and erect 

 and not strongly differentiated from the above mentioned bristles and those on the 

 distal segments ; the sides of the second and third segments broadly, the fourth seg- 

 ment wholly, yellowish red or reddish yellow. Venter reddish yellow, with a narrow 

 median blackish stripe. Legs black. Wings grayish hyaline. Length, 6 mm. 



One specimen, Texas (Belfrage) , reared from Thecla autolycus, May 15. 



Phorocera edwardsii, n. sp. PI. 89, fig. 52. 



Female. — Face opaque white, scarcely at all variable; the cheeks below the eyes, 

 only, show indications of the ground color. The lateral rows of bristles on the sides 

 of the median depression are well-developed, and reach nearly or quite to the base of 

 the third antennal joint and to opposite the last bristle of the frontal rows. Antennae 

 black, the second joint reddish yellow; third joint reaching nearly to the epistoma, of 

 equal width throughout, not narrow. Palpi reddish yellow. Sides of the front with 

 a distinct brassy yellow tinge, broader than the median reddish brown stripe ; near 

 the orbit on each side there are two bristles directed anteriorly, and on the verti- 

 cal margin there are two pairs situated near the upper angle of the eye ; the outer one, 

 the smaller of the two, Is directed obliquely outward and backward, the inner one 

 backward; behind the middle of the vertical margin there is an obsolete approximated 

 pair of short hair-like bristles ; the usual pair of anteriorly directed bristles in front 

 of the ocelli is present. Mesonotum rather strongly gray poUinose, leaving four dis- 

 tinct broad, more shining stripes. Scutellum broadly reddish, its margin on each side 

 with three stout bristles, its apes with a pair of small ones. Abdomen shining 

 black; the second, third and fourth segments each with a broad, distinct, gray, basal 

 band, variable in different reflections ; first and second segments each with a pair of 

 stout posterior bristles, second and third segments without median pair; the covering 

 of the abdomen, aside from the bristles mentioned and those on the last segment, is 

 composed of short decumbent bristles, strongly diflerentiated from the others. Legs 

 ■wholly black ; front femora gray poUinose behind. Wings grayish hyaline ; tegulae 

 white. Length, 7 mm. 



[The following description of the puparium was taken during life: — Depressed 

 cylindrical, rather short and thick, a little larger at the posterior end where there is a 

 raised , prominent tubercle having at each lateral corner a prominent wart ; on each side 

 is a double row of impressed and sunken nearly continuous longitudinal furrows ; the 



