DIPTERA. 



G35 



The terminal Scatomyzides have the seta simple; the antennas Q.ways short and straight ; they are small and 

 fflabrniis Flies, black, and more or less varied with bufT; the le;?s strong, and the eyes lar<;e. The upper side of 

 tlie head is flat, witli a brown, trianf^ular mask, in which the ocelli are placed. They are found in fluwera. Many 

 <it their larv* mine the interior of vetretables, and some are very injuriout, to agriculturists, destroying various 

 cereal plants previous to their fructification. The larva of Mmcci Frit sometimes destroy the barley crops in 

 Sweden, to the amount of 100,000 ti^olden ducats in a year, bein^,^ one-tenth of the produce. The larv£E of Oscinis 

 piimilionis and Ibieata, Fab., are equally obnoxious. They constitute our genus 



Ofichiis, Latr., to which we add the genus Chlorops, 

 Meig., and Piophila, Fallen. 



The fifth division (Dolichocera), "which em- 

 braces the genus Teianocera, Dura., is closely allied 

 to the preceding, but the length of the second 

 joint of the antennae, which equals or surpasses 

 that of the third, at once distinguishes it. These 

 organs are porrected, as long as, or longer than, 

 the head, and pointed at the tip. The upper 



Fiff. 137, 



surface of the head forms a triangle, obtuse at the tip. 

 Some have the antennje shorter than the head. 



Otites, has the seta simple, and the lower part of the face is not produced. 



Euf/njcera, Latr., has the seta plumose, and the lower part of the face produced into a truncated muzzle. 

 The others have the antenna? as long as, or longer than, the head. 

 Sepedon, Latr., has the antermt-e evidently longer than the head, and the seta simple. 

 Tcia/tocera, Dum., has the antennae as long as the head, and the seta sometimes plumose. 



The sixth division, Leptopodites, is remarkable for the length and slenderness of the feet, the 

 hind cues bei)ig at least as long again as the body, which is also slender and filiform ; all the tarsi are 

 short. The head is spherical or elli])Soid, and terminated in a poiut. The antenna; are very small. 

 They are found on plants, and many frequent aquatic places. 



Micropcsa, Weig., has the head ellipsoid, terminated in a point, and the seta of the antennae simple. Calohafa 

 filiformis, Fabr. 



Calohata, Fabr., has the head spheroidal, and the seta often plumose. 



Nerias, Fabr., has the habit of Micropeza, but ditfers iu the auteuna- being as long as the head. 



The seventh division, Carpomyz^e, has the wings vibratile, spotted with black or yellow, an appear- 

 ance very like that of the Domestic Flies, but with the eyes apart, and the abdomen with four or five 

 external segments, mostly terminated in the females by a cyiindric or conic ovipositor; the antennje 

 always short, with the seta rarely ^'illose. The larvaj of many species live in fruits or seeds, in the 

 germ of which the parent fly had deposited its eggs. 



Many species approach the preceding subgenera in the narrow and elongated form of the body, and long logs, 

 as well as in the globular or more elongated form of the head. 



Diopsis, Linn., distinct from the very elongated horns into which the sides of the head are produced, and the 

 scutellum with two spines. These singular exotic insects have been monographed by Dalman, [and subsequently 

 by me, in the Traiuactians of the Limucan Society], 



CephaUa, INIeig., has the palette of the antennae narrow and long, and the palpi spatulate. 



Sepsis, Fall., has the palette much shorter, with a naked seta, and tlie palpi nearly liliform. [Small, active Flies, 

 with wings spotted with black.] 



The other Carpomyza: have the appearance of Common Flies, with the head short and hemispherical, and the 

 legs of moderate length. 



The three following subgenera have the upper surface of the head almost horizontal, so that the antenna' appear 

 inserted on a level with the fop. 



Ortalis, Fall., has the abdotnen not terminated by an external ovipositor in the females. &I. Fallen refers the 

 Musca cerasi, Linn., to tliis subgenus, the larva of which generally feeds inside the fruit of the cherr)-, rpiittiug 

 the fruit and entering the earth when ready to undergo its transformations. 



Tetanops, Meig., has an exserted ovipositor in tbe females, like a tail ; the head, seen from above, appears nearly 

 triangular. 



Tephrites, Latr. {Tiypeta, Meig.), has the abdomen similarly terminated, but the head is rather transverse than 

 longitudinal, and rounded. Mti^ca Cardui, Linn., the larva of which lives in galls, on the common thistle, on 

 the substance of which it feeds. 



Dacus, Fab., comprises those Tephrites which have the palette more elongate, including the species wliich 

 attacks the olive. The inhabitants of the Isle of France are scarcely able to obtain any sound lemons, in conse- 

 quence of tbe attacks of a species of this genus. 



