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713. 

 LEPTIS DIADEMA. 



Order Diptera. Fam. Rhagionidae or Leptidaa. 



Type of the Genus, Leptis helvola Meg. 



Leptis Meig., Curt. — Rhagio Fab., Lat. — Chrysopila Macq. — An- 

 thrax Panz. — Musca Linn. 



AntenncB inserted near the middle of the face, porrected, approx- 

 imating, compressed, triarticulate, hairy ; basal joint cup- 

 shaped, 2nd transverse-oval, 3rd as large as the 1st, orbicular- 

 conic, the apex acuminated and elongated into a setaceous pu- 

 bescent seta (3). 



Lahrum longish, hollow and broad, the apex rounded (I h). 

 Tongue nearly as long but narrower, the sides thickened or re- 

 flexed, the apex obtuse (c). 



Maxillce nearly as long as the tongue, lancet-shaped and a little 

 curved {e). Palpi exserted, longer, stout, recurved, clavate and 

 bristly (/). 



Lip short and thick, composed of 2 large oval lobes with a few 

 hairs or quite naked (g). 

 Head broad, transverse-ovate : eyes very large and meeting on the 

 crown (2*), ivith the superior portion more coarsely granulated than 

 the inferior half in the males (2 ^) ; remote and smaller in the fe- 

 males (2 $ ) .• ocelli 3, mounted on a tubercle, near the base of the 

 head. Thorax ovate-quadrate : scutel semiorbicular. Abdomen 

 rather short and slender in the males, stouter and conical in the fe- 

 males, the apex telescopiform. Wings divaricating, ample, with 1 

 long discoidal cell, and 1 long, 2 short and 3 other marginal cells : 

 halteres long and capitate. Legs long and slender, especially the 

 hinder : thighs long : tibia; longer and very slender, with 2 distinct 

 spurs at the apex of the intermediate, and 2 minute ones in the hinder 

 pair: tarsi long, slender and 5-jointed, basal joint very long, 4th 

 small : claws small : pulvilli trilobed. 



DiADEMA Linn. — Curt. Guide, Gen. 1189. 4. 



Male. Head slate colour : antennae and palpi piceous, lip ochre- 

 ous, eyes purplish black : thorax, scutel and abdomen clothed 

 with aureous hairs, the base of the segments in the latter black : 

 wings iridescent with a yellowish tinge, stigma and nervures 

 pale brown, the former margined with yellow : halteres pale 

 ochreous, the club piceous : legs ochreous, upper edge of hinder 

 thighs, apex of tibiae and tarsi fuscous. Female clothed with 

 shining yellowish or greenish depressed hairs, the segments 

 slightly fuscous : stigmatic spot yellowish. 



In the Author s and other Cabinets. 



In illustrating the genus Rhagio, I lately observed that it is 

 principally distinguished from Leptis by the shape and atti- 

 tude of the palpi, which in the latter are recurved, and the 4lh 



