DIPTKROUS PARASITES. 1919 



reddish bi-owii; tarsi brown. Pali illi niiii-iiiaUy larje; uiisues ? (The wings in the 

 described specimen are injured.) Lengtli. 7 mm." 



"A single specimen bred from Cynthia [Vanessa] cardui (C. V. Riley). This species 

 is lilie E. futilis in the distribution of bristles on the front and in the strncture of the 

 antennae. It differs in the presence of an additional pair of macrochaetae in the mid- 

 dle of the second and of the third abdominal segments; also in the comparitive small- 

 ness of the intermediate pair of macrochaetae on the apex of the scutellum." 



In comparing the above description of Osten Sacken's with the t^-|)e 

 specimen, I find but one thing I would amend. Baron Osten Sacken 

 describes the legs (femora and coxae) as "reddish." I would insert the 

 word yellow after it. Whether this unusual light color is normal, and, 

 if so, of varietal or specific value, I cannot decide; but in a specimen 

 sent by Mr. Scudder, and bred from Thanaos brizo, I can not find any 

 other important differences, aside from the sexual ones of the frontal bris- 

 tles and pulviUi. The legs in this specimen are quite black, the tibiae only 

 being a little reddish. Such distinct difference I have never seen in allied 

 Tachinidae, but until further specimens are examined, it will be better to 

 consider it varietal, and which may be indicated by the name proserpina. 

 The front in both sexes is narrower than usual. 



Exorista hirsuta Osten Sacken. PI. 89, figs. 13-15. 



Tachina {Exorista) hiraiUa Osten Sacken, Can.idiau Entomologist, xix, p. 163, 1887. 



Male. — Face and cheeks silvery gray, the sides and cheeks changing iu different re- 

 flections, the ground-color black, with the oral margin in front yellow; above the vi- 

 brissal bristle there are two or three small bristles, and above these there is a row of 

 hairs, not reaching as high as the lowermost of the frontal bristles. Antennae black, 

 reaching to near the oral margin ; the third joint broad, with parallel sides, three or 

 four times as long as the second joint; arista thickened for more than half of its 

 length. Palpi dark brown or l^lack. Fi-ont less thickly poUinose than the face, with a 

 yellowish cast, the black ground-color more apparent above; median stripe broad, 

 deep reddish brown. The single row of well-pronounced bristles descends below the 

 base of the third antennal joint, there being three below the base of the antennae; 

 posteriorly the row terminates in a stout, long, vertical, backwardly directed bristle; 

 the two bristles in the same row in front of these are only a little stronger than the 

 more anterior ones. Just without the two vertical bristles there is, on each side, 

 near the angle of the eye, a smaller bristle directed outward and backward behind the 

 vertical margin ; in the middle there are two small bristles directed gently forwards ; 

 in front of the ocelli the usual pair of stout, anteriorly and outwardly directed bristles . 

 Eyes pnliescent. The bluish black, shining mesonotum shows very distinctly through 

 the grayish dust, which leaves (when seen from behind) five stripes, the middle one of 

 which is very slender; the bristles of the mesonotum are rather stout. Scutellum red 

 at the tip ; on each side the margin has three bristles, and at the tip there are two ap- 

 proximated, additional, weak ones. Abdomen black, with a broad, grayish, pollinose 

 band at the base of the second, third and fourth segments, variable in different reflec- 

 tions ; first segment with a pair of bristles behind, second with a median and posterior 

 pair ; third with a median pair and the usual posterior row ; the bristly covering of 

 the abdomen is, however, stronger and thicker than usual, so that these bristles are 

 only moderately differentiated from the rest. Legs wholly black. Front femora pol- 

 linose behind. Wings grayish hyaline; tegidae nearly white. Length, 7 mm. 



Female. — Like the male, except that the third antennal joint is comparatively 



i 



