G34 LNSECTA. 



the appearance of Common Flies; the wings not vibratile ; the antennas inserted near the forehead, 

 always shorter than the head, terminated by a long or linear joint, with the seta mostly plumose ; the 

 legs are of moderate size, and the abdomen composed of four joints. 



Anthomyia, Meig., has the seta of the antenna plumose ; the abdomen in both sexes pointed at the tip, and the 

 pi-oboscis not terminated Uke a hook. Mnsca pluvialis, Linn. 



Dnjmeia, Meij., has the prohoscis exhibiting- this character, find the eyes united Ijehind, in the males. 



C'<c«o^ia, Meig., has the ahdomen of the males swoUen at the tip. Tlie larvae of C.//(/?^o/7fw live in boleti, and 

 often in the edible mushroom. De Geer observed, also, that these larvie will destroy each other. 



Erip/iia, Mc-i^., has the antenna: shorter, with a simple style, and the eyes of the males united behind. 



Our third division, Hydromvzides, has the head almost triangular, with the eyes very prominent ; a 

 swollen and vaulted muzzle ; a very thick proboscis ; and the sides of the face not bristly ; the antennae 

 are v(jry short, with the style plumose : the legs are strong. All the indigenous species are found in 

 aquatic situations. 



Ropalomera, Wicd., has all the thighs swollen, and the face has a frontal tubercle. 



Ochtheni, Latr., has the thighs of the fore-iej^s very robust, denticulated beneath ; the tibiae curved, and applied 

 a;;ainst the thij^hs, and terminated by a strong spine. In the fullowing ilyi-lromyzides, the thighs are not 

 swollen. 



Epin/'fra, Fall., has the eyes very prominent ; the muzzle thick ; and the seta of the antennae thick at the base, 

 and simple. 



Xotiphila, Fall., has the head rounder, without a frontal muzzle. 



Tlic iMuscidi'S of the three following divisions have the body oblong; the wings incumbent, not vi- 

 bratlk' ; the head nearly spherical, and the face covered by a white membrane, with an impressed line 

 on eacli side. The antennce are sometimes inserted in fossuhc, but ofceucr porrected, and in many 

 as long or longer than the head. 



The fourth division, Scatomyzides, are distinguished liy the head being never longer than broad, 

 nearly spherical ; the hind legs not greatly elongate ; the antenna?, with the third joint longer than the 

 preceding, and, except in Loxocera, always shorter than the head. 



Slime liKvi; tlir hind le^s larg-e, with thick compressed thighs ; and the antennae very short ; with a simple seta. 



Tliiireojilioni, Latr,, has the antenna lodged beneath a frontal prominence ; and the second and tuUowingjoints 

 of the tarsi nearly alike. T. cynojiMla, Panz., has the scutellum bispinose; it is ahuoat always found on the dead 

 carcases of dogs, and M. Percberon has assured me it is sometimes phosphorescent. 



Sphterocero, Latr. {JSorborus, Meig.), has the antennae exposed, with the palette hemispherical ; the hind thighs 

 are compressed, with the two hasal joints of the tarsi e\ddently larger than the following. It is almost always 

 about manure that these Diptera are found, and it is probably there that their larvae reside. 



Sometimes the hind legs do not materially differ from the others ; the antcniut are nearly as long as the face, 

 deflexed, and terminated by an elongated, narrow jialette. 



JJiab/ia, JMeig., has the face bristly ; the abdomen 4-jointed, and the seta of the antenns simple. 



Cy)7/(///(;-a, Fall., has the face bristly; the abdomen a-jointed, and the wings scarcely extending beyond the 

 abdomen. 



iScafop/ifi;-/n, Lfitr., dilTers from the last in having the wings longer than the attdomen, which is ne\er clavate. 

 Mnsca sfercoiaria, Linn., a very conimon hnfi-coloured species, found in great numbers upon excrement, in wliich 

 the females deposit their eggs. 



Loxocera, Latr., has the face not bristly ; the body long, narrow, and the antenna' much longer than the head. 



Chijliza, Fall., has the antennae sliorter than the head, with the seta thick, like a style. 



The others have the antennae always much shorter than the face, with the jialette either oblong, o\oid, or 

 nearly globose. 



Some of these have the body narrow and elongate, and the abdomen pointed or styhite ; sometimes the face 

 is naked. 



Li-s.sii, Meig., has the upper side of the head with an ele\'afi(.in, and the abdomen is almost linear. 



Ps'ilojiniia, Latr. (to uhich Geom'/^a, Fall., may be addi;d), has the body less elongate, and the abdomen ter- 

 miniiled by an articulated style. 



Ti-hiiinrit and Tani/peza, Rleig , are allied to the preceiling ; the legs in both seem longer, and the abdomen of 

 Tet;iiinrfi is obtuse at the tip, and that of Tanypeza pointed or stylate in the females. 



Liiiirhoptern, Meig., has the face bristly at the sides, and the basal joint of the antenna; is verv slender ; the 

 ^^ ii!gs have iiu transverse nerve, except close to the base. 



The body in the other Scatomyzides is thicker and more oblong, and its form is more like that of the common 



llniisc-ily. 



il.-hnunjz.t, Fi.ll,, h:i:. the head bristly. 



I)r;i",iiii^n, Fiill. (willi the fare concave berieatli the anteiin;e), and 



t-Uiiiromijza, Fall, (wiih it straight), differ from the following in having the antcnnal seta plumose. 



l: 



