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120. 

 TYROPHAGA CASEI. 



Order Diptera. Fam. Muscidae Lat., Leach. 

 Type of the Genus Musca putris Linn. 



Tyrophaga Kirby. — Tephritis Fab., Lat. — Musca Linn., Fab., &;c. 

 Antenna nutant, inserted at the top of a cavitv in front of the 

 face, 3-jointed, 1st joint small, 2nd cup-shaped, witli a few strong 

 bristles, 3rd large, pubescent, ovate, from the outerside of which 

 near the base arises a seta, the ba!=al joint being small, the other 

 setiform and very long (fig. 3). 



Lnbruni short, horny, hollow, attenuated, bifid at tlie apex (lb). 

 Tongue nearly as long as the labrum, obtuse, flat and membra- 

 nous at the apex (c). 

 Mandibles and MaxillcE none. 



Pnlpi 2, longer than the labrum, fleshy, clavate, pubescent and 

 pilose (f). 



Lip large, fleshy, membranous at the edges, bilobed, pilose (g). 

 Proboscis nearly vertical, exsertcd, arising from a large cavity at the 

 bottom of the head (2, g). Head subglobose, not produced in front. 

 Eyes remote in both sexes, rather small. Ocelli 3, minute, in tri- 

 angle. Thorax subquadrate. Scutellum trigonate. Wings divari- 

 cating, transparent, containing about 12 perfect cells. Halteres large, 

 clavate. Abdomen linear in the males, lanceolate in the females. 

 Legs, middle pair the most slender, hinder the longest. TibitE simple, 

 hairy. Tarsi it-jointed, slender, attenuated, basal joint long. Claws 

 small slender. Pulvilli small (8, afore leg). 



Casei Linn. Faun. Suec. p. 456. n. 1850 /3. 



Smooth, shining, greenish black : anterior part of head ferrugi- 

 nous, beneath ochraceous. Wings iridescent, transparent, slightly 

 ferruginous at the base, nervures ochraceous. Halteres ochrey. 

 Coxae and trochanters ochrey. Thighs ochrey at the base and 

 apex, especially the middle pair. Tibiis deep ochrey, the first 

 and last pair black at their apex. Tarsi, anterior black, remain- 

 der ochrey, the 2 last joints and claws black. 



In the Cabinet of the Author. 



Every one has observed the curious larvae in cheese, called 

 maggots or hoppers : it is, however, not generally known that 



