380 INSECTS. DIPTERA. 



T. bovinus, Lin. Head grayish white,, with the eyes of a shining 

 green when the insect is alive, and brown when it is dead ; tho- 

 rax blackish ; abdomen blackish brown, with the sides of the seg- 

 ments and their posterior margins reddish brown, and a row of 

 spots of the same colour, but paler on the middle of the back ; 

 wings transparent, veined with brown ; feet blackish, with the 

 legs reddish white. 11 lines long. Found in Europe in sum- 

 mer on oxen and horses Nouv. Diet, xxxii. 443. 



T. aulumnalis, Lin. Head gray ; thorax brown above, with whit- 

 ish hairs on the sides, and five lines on the middle ; abdomen 

 brown above, with a triangular spot on the middle of the wings, 

 and a small rounded one on the sides ; wings transparent, veined 

 with brown ; feet gray, with a large yellowish spot at the base 

 of the legs. Inhabits Europe Nouv. Diet, xxxii. 444. 



TRIBE II. SICARII. 



Rostrum often concealed in the greater part, and terminated by 

 two projecting lips ; sucker composed of four pieces ; last 

 joint of the antennae destitute of style or seta, and with three 

 transverse divisions. 



Gen. CCENOMYIA, CHIROMYZA, PACHYSTOMUS. 



Gen. CffiNOMYiA, Lat. Tabanus, Vill. Sicus, Fab. 

 Antennae of three pieces, of which the last is longest, conical, 

 with eight rings or small joints ; rostrum projecting, short, 

 terminated by two large lips, inclosing a sucker of four setae ; 

 palpi exterior ; wings resting on the body ; scutellum with 

 two spines. 



C.ferruginea, Lat. Reddish, with the scutellum bidentate, and 

 whitish spots on the sides of the abdomen, this last part being 

 blackish in the male. Lat. Gen. iv. 281. 



TRIBE III. MYDASII, Lat. 



Palpi not exterior or wanting ; last joint of the antennae termi- 

 nated in a style or ovoid club, divided transversely in two, 

 with an umbilicus at the end, in the form of an elongated 

 cone, or subulate. 

 Gen. MYDAS, THERE VA. 



Gen. MYDAS, Fab. Lat. 



Antennas longer than the head, with the third and last joint 

 ovoid, elongated, and terminated in a club, and an indistinct 

 style inclosed in an umbilicus at its extremity. 



M. filatus, Fab. Body black, with the sides of the second segment 

 of the abdomen transparent ; wings obscure blue ; posterior thighs 

 serrated. Inhabits North America. Nouv. Diet. xxii. 108. 



TRIBE IV. LEPTIDES. 

 Palpi exterior ; antennae always very short, of almost equal thick- 



