n 



HELCOMYZA USTULATA. 



Order Diptera. Fam. Muscidae JLat.^ Leach. 



Type of the Genus Helcomyza ustulata Meig. 



Helcomyza Meig. Scatophaga Fab., Lat. Musca Linn., Fab. 



Antenna; inserted near the centre of the face, somewhat nodding, 



3-jointed, 1st and 2nd joints pilose, the former small, cylindric, 



tlie latter cup-shaped, 3rd large pubescent, somewhat ovate, from 



the outside of which near the base arises the seta, the basal joint 



is small, cylindric, the terminal one subulated, hairy (3). 



Labrum not so long as the lip, horny, hollow^ dilated at the 



base, somewhat acute at the apex (1, b). 



Tongue nearly as long as the labrum^ subulated, acute (!> c). 



Mandibles and 1 



Maxillce J 



Palpi 2 longer than the labrum, membranaceous, exartlculate, 



clavate, very hairy ( 1 , e) . 



Mentum ? long slender (1, h). Fig. a, is part of the head which 



receives the labrum &c. 



hip large, membranaceous, bilobed, hairy (1, g). 

 Proboscis vertical, partly exserted {2, g). Head somewhat triangu- 

 lar, slightly produced in front at the insertion of the antennce. 

 Vertex horizontal. Eyes rather small, not prominent, distant in both 

 sexes. Ocelli 3, placed close together. Wings incumbent, transpa- 

 rent with about 13 cells in each. Halteres visible. Thighs robust, 

 posterior the longest. Tibiae simple hairy, without bristles. Tarsi 

 5-jointed, \st joint the longest in the 4 anterior feet only, not longer 

 than the 2nd in the posterior pair, in the males at least, 4th joint 

 cordate, terminal joint truiicated. Claws simple. Pulvilli large 

 (8 afore leg). 



Ustulata Meigens MSS. 



Cinereous, hairy. Face silvery white. Crown of head brownish, 

 with very minute black hairs. Eyes castaneous. Thorax brown- 

 ish, pale on the sides, with 4 obscure longitudinal darker lines, 

 closely covered with short black hairs, and a few black bristles to- 

 wards the sides, and upon the scutellum, which is brownish also. 

 Abdomen entirely cinereous, covered with long soft black hair. 

 Wings transparent, pearly white, excepting the 3rd costal cell 

 which is ferruginous, a black spot upon the transverse nerve near 

 the centre of the wing, and a paler one at the junction of the 

 nerves below, and nearer the base. Halteres ochraceous. Legs 

 thickly covered with .soft black hairs. Tibiae, tarsi, and pulvilli, 

 ferruginous, tinged with cinereous. 



In the Cabinets of the British Museum, Mr. Dale, and the Author. 



