298 S. W. WILLISTON. 



Hj'strieia anibigua Macquart, Dipt. Exot. 4e Suppl. 172, 9. 



Hal). — Colorado, Mexico. 



Four specimens agree sufficiently well with Macquart's description, 

 except tliat the third anteunal joint is very distmctly longer than 

 the second ; the front femora are broadly pollinose behind. 



Hystrieia abriipta Wiedemann, Aiiss. Zw. 293, 22 (Tachina) : H. festacea 

 Macquart, Dipt. Exot. ii, 3, 44, pi. iv, fig. 4 ; Tachina vivida Harris, Ins. New 

 England, 3d ed. 612, pi. v, iii, fig. 1 ; Tachina finiUma Walker, List, etc., iv, 70. 



Hab. — New England, Washington, Nova Scotia, Mexico. 



The identity of Wiedemann's species seems sufficiently evident. 



Hystricia soror n. sp. 



Female. — BhicK scutellum dark red, palpi yellow ; second joint of the antennaj 

 short, third long and broad, convex in front. Length 10 mm. 



Eyes densely lutescent pilose. Front with two rows of bristles, the inner one 

 extending only a little ways on the face. Occiput with black hair and white 

 pile. Face thickly covered with light gray pollen, less thick on the sides of the 

 front. Antennfe black, first two joints as in H. abruptn, the third about four 

 times as long as the second, reaching nearly to the bottom of the face, broad, 

 convex in front. Thorax light grayish pollinose, the dorsum with the beginning 

 of slender stripes in front; scutellum, except the base, deep red, thickly beset 

 with spines. Abdomen deep black, shining, wholly and densely beset, except 

 the first segment, with stout black spines; venter in the middle thickly clothed 

 with similar spines. Legs black, the tibise, faintly reddish ; distal front tarsal 

 joints disciform. Wings nearly hyaline. 



One specimen, Arizona. I would have identified this with the 

 South American H. mgriventris Macquart (Dipt. Exot. ii, 3, 44, pi. 

 iv, fig. 3 ), excej)t for the " ailes d'un brunatre fonce." 

 Juriiiia algens Wiedemann, Auss. Zw. ii, 285, 8 (Tachina). 



An examination of a considerable number of specimens that may 

 be included under this species discloses differences perhaps specific. 

 I give them briefly. 



«,. % . — Epistoma moderately projecting, palpi slender, antennte black, third 

 joint two-thirds as long as the secoiid, rounded on the angles below and moder- 

 ately dilated ; front broad. 



Three specimens, Massachusetts, Minnesota, Montana. 



6. 'J, . —Front distinctly narrower, second joint of antennae usually red ; palpi 

 slender or a little dilated. 



Ten specimens, New Hampshire, Connecticut, Pennsylvania, 

 Oregon, Wyoming. 



c. 'h ■ — Epistoma more projecting ; antennie black, the second joint reddish at 

 the end, third joint very much dilated, nearly equilaterally triangular, the an- 

 terior angle projecting, the posterior rounded, two basal joints of arista elongate. 

 Front broader than in b. 



