OCR Text |
Show 288 INSECTA. consequence of this operation are tumours or lumps, on the in· ternal pus of which the larvre feed. Horses also are subject to them. 'fhe Rein-Deer, Antelope, Hare, &c., also nourish various Iarvre of CEstri, but of a different species. (E. ovis, L.; Clarck, Lin. Trans., III, x:x.xii, 16, 17. Five lines in length, and bl).t slightly pilose; head greyish; thorax cinereous with elevated black points; abdomen yellowish, finely ' . spotted with brown or black; legs pale-brown; wmgs transpa-rent. The larva inhabits the frontal sinus of the Sheep. That of the species called trompe, Fab., is found in the same parts in the Rein-Deer. . (E. equi, Lat.; Clarck, Ibic.J., x:x:xiii, s, 9. But slightly pilose, and of a fulvous-brown; abdomen paler; two points and a band on the wings, black. The female deposits her ova on the legs and shoulders of Horses; the larvre inhabit their stomach. (E. hremorrhoidalis, L.; Clarck, Ibid., 12, 13. Densely pilose; thorax black, with a pale yellow scutellum; abdomen white at base, black in the middle, and fulvous at the end; wings immaculate. The female deposits her eggs on the lips of Horses, and the larvre live in their stomach. (E. veterinus, Clarck, Ibid., 18, 19. Completely covered with russet hairs; those on the sides of the thorax and base of the abdomen, white; wings immaculate. The larva inhabits the stomach and intestines of the same animal. It is possible that the female may deposit her ova on the margin of the anus. The third tribe of the Athericera, that of the CoNOPSARIJE, is the only one of that family in which the proboscis is either always salient and siphoniform, cylindrical or conical, or setaceous. The reticulation of the wings is the same as in our first division of the Muscides. Most of these Insects are found on plants. They form the genus DIPTERA. 289 CoNOPs, Lin. In some the body is narrow and e1 o ngated the bd curved underneath, and with th I ' a omen clavate, T e rna e organs of g · he second joint of the antennre . 1 eneratlOn salient. third, which, either alone or rn 1St at east almost as long as the ' os common! · · forms a fusiform, or ovoid and c ompr·essed clubY conJomtly with it, Here, the proboscis projects and is oni . . . Sometimes the antennre are h I y gemcuiate near lts origin. minated in a fusiform club Tlmuc. onger t~an the head, and ter- . le wmgs are d1stant. SYSTROPus, "Tied.-Cephenes, Lat. Where the last joint of the anten 1 destitute of a stilet The abd ?eel a one forms the club, and is • omen 1s ong and 1 d sects, peculiar to North America, resemble litt~ee~ er. These I?- antennre are longer in proportion than th f pheges. Their boscis slightly ascends( 1 ). ose ° Conops, and their pro- CoNoPs, Fab. Lat. Meig. Or Conops, properly so called, where the two last .. t f tennre formed a club, with a terminal stilet. JOID s o the an- C. macrocephala. Fab. Black. antenn y~llow, ~ith a black streak; r:ur anuu~ :~dt~;sa~u~vous; head gmed Wlth yellow; edge of the wings black. omen mar- C. rujipea, Fab. Black; abdominal annuli l . . base of the abdomen and legs f 1 d ec ged WHh whtte; I d ' u vous; e ge of the wings bl I t un ergoes its metamorphos· . I ac '· B b . • lS lD t le abdomen of J' · om I, and tssues from between the . f Ivmg footless larva found in the B I .d rt.ngs .flo ~he abdomen. A · a pi aria- pzs lapidar · L and perhaps that of this s ecies of ,a, ·late M. Lachat and M A ~ . . Conop~, has furnished the ' U OUID Wllh a SUbjeCt for lent anatomical observations(2). some excel- (1) Wiedemann, Dipt. Exot., r, vii. (2) See Fab., Lat., Meig & d 1 d'Hist. Nat. de Par., &c. ., c., an t le first volume of the Mem. de la Soc. VoL. IV.-2 M . |