JO'Jt2>Z 



All. 



TACHYDROMIA ARROGANS. 



Order Diptera. Fam. Tachydromidae. 



Type of the Genus, Musca arrogans Linn. 

 Tachydromia Meig., Fab., Macq., Curt. — Sicus Lat. — Calobata 

 Fab. — Empis Panz. — Musca Linn. 



Antenna inserted between the eyes at the middle of the face, 

 contiguous, as long as the head, 3-jointed, basal joint subglo- 

 bose, 2nd ovate and hairy beneath, 3rd a long naked seta in- 

 serted a little above the apex of the 2nd joint (3), 

 Labrum and Tongue undiscovered. 

 Mandibles and Maxillce none ? 



Palpi large and drooping, oval cylindric, densely clothed M^ith 

 long hairs, and furnished with a bristle at the apex {f). 

 Labium short, horny and attenuated, hollow and slightly cleft 

 at the apex {g). 

 Proboscis exserted (2 g). Head ovate : eyes large and lateral, covering 

 a great portion of the head : ocelli 3 in triangle on the crown of the 

 head (2 *). Thorax broader than the head, elongate-ovate : scutellum 

 short and transverse. Abdomen short, obtuse in the males, atte- 

 nuated at the apex in the females. Wings much longer than the 

 body, incumbent and parallel when at rest ; costal cell short, 4 lon- 

 gitudinal nervures, 2nd and 3rd united by a straight nervure nearer 

 to the base than that uniting the Srd and 4th, forming 2 discoidal 

 cells, the superior being shorter and broader than the inferior ; anal 

 nervure 7-udimentary (9). Halteres large, the peduncle short and 

 stout, the club elongate-ovate. Legs rather long. Thighs ; the \st 

 and sometimes the 2nd pair incrassated with a double row of minute 

 spines beneath, the posterior long and slender : tibiae, anterior clavate 

 with a series of spines on the inside, posterior the longest. Tarsi 

 longer than the tibia, 5 -jointed, basal joint very long, 4th the shortest. 

 Claws and PulvUli distinct (8, afore leg). 



Arrogans Linn. Faun. Suec. 1857. — Curt. Guide, Gen. 1210, 1. 



Black, shining: eyes castaneous, not meeting in front; antennae 

 with the 1st and 2nd joints subferruginous. Thorax with a cu- 

 preous tint. Wings very iridescent, with 2 broad fuscous bands, 

 leaving transparent spaces at the base and tip, and a narrow 

 curved fascia near the middle : halteres yellowish white, the 

 peduncle dusky. Legs ferruginous ochre, posterior thighs black, 

 and anterior tibiae dusky, except at their bases, the posterior 

 tibiae blackish the base and apex whitish : tarsi ochreous, an- 

 terior black at the tips, the posterior with the tips of the 1st and 

 2nd joints dusky, the others entirely black. 



In the Author's and other Cabinets. 



MoNS. J. Macquart has added several new genera to the 

 Tachydromidae, and he has restricted the typical genus, which 



