1920 THE BUTTERFLIES OF NEW ENGLAND. 



shorter and broader, the epistoma somewhat projecting, and the two usual, anteriorly 

 directed, ortjital bristles are present. The second abdominal segment has a pair of 

 posterior bristles, as in the male. 



Two specimens, the type, and a male from Mr. S. H. Scudder, both 

 bred from Pieris rapae. Characteristic of the species is "on the fourth 

 abdominal segment a number of macrochaetae, giving it a bristly appear- 

 ance ; the smaller hairs of the abdomen are more erect, longer and bristle- 

 like than in E. futilis and E. blanda," as stated by Osten Sacken. It is 

 possible that this species may be the same as E. vulgaris Meigen, parasitic 

 in Europe upon Pieris rapae. The description applies. In the type speci- 

 men the two bristles on the posterior margin of the second abdominal 

 segment are wanting and so described by Osten Sacken, but a careful 

 examination discloses their scare. 



Exorista theclanim Scudder. PI. 89, figs. 17, 19. 



Tacliina theclanm Scudder, Canadian Eutomologist, xix, 165,1887. 



Male, female. — Face silvery gray, but little variable in diHerent reflections, the 

 ground-color of the sides below, and the oral margin in front, red ; there are but four 

 or five short, bristly hairs on each side, above the vibrissal bristle. Palpi black. An- 

 tennae black, reaching to the oral margin, the third joint rather broad, of equal width 

 throughout, and four or five times as long as the second joint. Sides of the front 

 more thinly gray poUinose, the shining blue-black ground-color easily apparent above ; 

 medial stripe moderately broad, reddish brown, acutely emarginate behind for the 

 shining ocellar space; bristles arranged as iu E. hirsuta, the uppermost two bristles 

 of each lateral row just below the ocelli are stout and much stronger than the ones 

 preceding them ; below, the bristles descend on the side of the face as in E. hirsuta; 

 among the frontal bristles are erect, fine black hairs; in the male, the bristle at the 

 upper angle of the eyes and the orbital frontal bristles are wanting. Mesonotum 

 shining blue-black, not thickly poUinose; when seen from behind, with the beginning 

 of five distinct, slender stripes. Scutellum broadly red on its border; the margin on 

 each side with three stout bristles, and, at its apex, with a moderately approximate 

 pair, scarcely smaller than the others. Abdomen shining; on the third and fourth seg- 

 ments usually metallescent black; second segment with a broad, basal, pale gray, pol- 

 linose baud, variable in difl'erent reflections ; often a similar, narrower one on the third 

 segment; anterior angles of the third segment in the male with a red spot; first and 

 second segments each with a posterior pair of bristles, strongly dift'ereutiated from 

 the erect, bristly hairs of the dorsum. Legs black. Wings grayish hyaline ; tegulae 

 white. Length, 5 mm. 



Seven specimens, including the types ; three bred from Cyaniris pseu- 

 dargiolus, the fourth from the District of Columbia (Pergande), the fifth 

 without locality (Connecticut?), and the types, bred by Mr. Saunders 

 from Thecla calanus. The metallescent color, usually apparent on the pos- 

 terior part of the abdomen, together with the small size, will help to render 

 this species i-ecognizable. Mr. Scudder's description, drawn from living 

 specimens, speaks of the abdomen as "piceous," and it may be well to 

 note that in many specimens the abdomen acquires a deeper opacity, with 

 more obscurity of the lighter ground-color after death. 



