705. 

 RHAGIO HEYSHAMI. 



Order Diptera. Fam. Rhagionidae or Leptidae. 



Type of the Genus, Musca tringaria Linn. 

 Rhagio Fub., Oliv., Lat., Curt. — Leptls Me'ig., Macq. — Atherix, 

 Sciara Fab. — Asilus Geoff. — Nemotelus DeG. — Musca Linn. 

 Antenna inserted at the middle of the face, approximating, small, 

 porrected, pubescent, triarticulate, 2 basal joints cup-shaped, 3rd 

 similar in size and form, but the apex is produced and forms a 

 long pubescent filiform seta (3). 



Labrum rather short, stout, horny and lanceolate (1 b). 

 Tongue nearly as long, slender and very flexible, almost mem- 

 branous (c). 



MaxillcB as long as the labrum, slender and pointed (e). Palpi 

 much longer, exserted, very large, drooping, curved, subfusiform 

 and very hairy, narrowed beyond the middle and appearing bi- 

 articulate (/). 



Labium short and stout, forming 2 long oval hairy lobes {g). 

 Head not large, very short, the face orbicular : eyes contiguous in 

 front and nearly covering the head in the males (2 the profile) ; re- 

 mote in the females (2 $ , the tipper side) : ocelli 3, minute, mounted 

 on a tubercle near the base and forming an elongated triangle. Thorax 

 globose, the shoulders prominent : scutel hemispherical. Abdomen 

 long, slender, and tapering in the male with the apex obtuse, conical 

 in the female, the 3 apical joints very slender and capable of great 

 elongation. Wings divaricating in repose, very ample, with one 

 discoidal and 5 marginal cells : halteres capitate. Legs long, espe- 

 cially the hinder : tibise spurred, except the anterior : tarsi long 

 and 5-jointed, basal joint long, attenuated in the hinder, 4th joint 

 the shortest except in the anterior, in which it is as long as the 5th, 

 this is obovate : claws and pulvilli distinct, the latter trilobed. 

 Larvae fleshy, long and cylindrical, attenuated to the head, which is 

 small ivith two little antenna ; feet none, hut their place is supplied 

 by papillary tubercles j they cast their skins to become Pupae. De 

 Geer. 



Heyshami. — Curt. Guide, Gen. 1188. 3. 



Pale slate colour : eyes bronzed ; face and underside clothed 

 with white hairs, those on the thorax and abdomen black : an- 

 tennae fuscous : thorax with 3 pale lines down the back, uniting 

 at the base, the lateral margins of the same colour : abdomen 

 orange-ochre, basal segment, a large spot on the disk of the 2nd 

 and 3rd, and a larger quadrate one on the 4th black, the follow- 

 ing segments entirely black : wings yellowish brown, brightest 

 at the costa, nervures and a long stigmatic spot brown : halteres 

 ochreous : legs piceous, tips of anterior thighs, tibise and base 

 of tarsi ochreous, the hinder legs with the base only of the 

 tibise ochreous. 



In the Author's Cabinet. 



