41 



pean species of the same genus {Tnjpeia signata. Meigen, otherwise 

 called cerasi,) which infests the cherry, the barberry, and several other 

 fruits. 



The Apple Maggot Fly. (Trypeta pomonella, WUlsh.) Head rust-red; 

 eyes and all tlie bristles black; front edge of the face and hind orbit of the 

 eye, more or less tinged with white. Thorax, shining black ; a humeral fil- 

 let, (vitta),and all but the extreme base of the scutel, white; on each side 

 of the thorax, above, a gray fillet, opaque, with short, dense, gray pubescence. 

 Abdomen, black, pubescent, with dusky hairs; the tip edge of the four basal 

 segments white above, the white terminal edge of the first of these segments 

 with short, white hairs: beneath, except the tip and a more or less distinct 

 medial fillet, dull rust-red. Oviduct, short. Legs, pale rust-red; the four 

 high thighs, except the knees, black; the tips of the four hind paws (tarsi), 

 and sometimes the front thighs, tinged with dusky. Witvgs, whitish-glassy, 

 banded with dusky somewhat in the form of the letters I J — the I placed 

 next the base of the wing, and the lower end uniting rather indistinctly with 

 the lower end of the F ; the base and the extreme tip of the wing being always 

 glassy. The anterior end of the I commences on the transverse shoulder- 

 vein and extends over the basal two-thirds of the second basal cell^ and the 

 whole of the third basal cell, beyond which it unites in a faint cloud with 

 the foot of the F. The main leg of the F extends nearly in a transverse 

 direction across the middle of the wing, straddling the middle transverse 

 vein and the tip of the first longitudinal vein ; from which last proceeds the 

 anterior branch of the F, skirting, but not quite attaining the costa and the 

 apex of the wing, and terminating on the tip of the fourth longitudinal vein. 

 The posterior branch of the F commences opposite to the middle transverse 

 vein, straddles the hind transverse vein, and terminates on the tip of the fifth 

 longitudinal vein. Length of body, 0.15 — 0.20 inch; expanse of wings 0.30 — 

 0.43 inch. 



Described from six males bred from Eastern apples, July 15th — 23rd; two 

 males and one female bred from Illinois haws July 23d — 28th. I am informed 

 by Mr. Sanborn, of the Boston Society of Natural History, that the species 

 is quite commonly taken in Massachusetts, although nobody had hitherto 

 recognized it as the Apple Maggot Fly. According to Osten-Sacken, "this 

 species seems to belong to the same group of Trypeta as the European sig- 

 nata, living in fruits, and not in the heads of plants belonging to the botan- 

 ical family Composite, as the majority do." There are forty-two species of 

 Trypeta exclusive of asteris Harris, which Osten-Sacken has since pi'oved to 

 be a mere synonym of solidaginis Fitch, described in Loew's and Osten-Sack- 

 en's work on N. A. Dipteru, and from all of these it differs essentially, 

 though it comes pretty near to cingiiiata Loew. After I had satisfied myself 

 upon this point, and forwarded a specimen to Baron Osten-Sacken, this gen- 

 tleman was kind eniugh to inform me that, since the publication of the 

 work on iV. A. Diptera, Loew had described in certain foreign publications, 

 not accessible to me, several additional N. A. species belonging to this genus. 

 Subsequently, at my request, he examined the descriptions of all these addi- 

 tional species, and ascertained that not a single species of them agreed spe- 

 cifically with my pomonella. So that now there can be no reasonable doubt 

 that the latter has hitherto been undescribed as a North American insect. 



