/b -/t 33 



469. 

 BORBORUS HAMATUS. 



Order Diptera. Fam. Muscidae. 

 Type of the Genus, Musca subsultans Linn. 

 BoRBORtrs Meig., Curt. — Sphscrocera Lat. — Copromyza Fall. — Ca- 

 lobataFwi. — Musca Linn., Fab. 



AntenncE porrected, rather remote and attached to a small pro- 

 tuberance in front of the face, arising from a cavity, with a 

 sharp margin covering the upper portion (2 and 2*) ; 4-jointed, 

 basal joint cup-shaped very pilose, 2nd large ovate and velvety, 

 3rd minute, inserted towards the upper part of the 2nd, 4th a 

 long seta sometimes sparingly pubescent (3). 

 Trophi received into a large cavity beneath the face (2 and 2*) . 

 Labrum broad hollow and attenuated to the apex (lb). Max- 

 illa very small and linear (e) : Palpi as long or longer than the 

 labrum, clavate and bristly on the under side (f). Lip short 

 and robust, terminated by 2 fleshy lobes, pubescent and 

 bristly (g). 

 Head subglobose slightly depressed ; face concave : eyes remote in 

 both sexes, orbicular and rather small : ocelli 3 in triangle. ITio- 

 rax subquadrate-orbicitlar : scutellum semiorbicular or suhtrigonate. 

 Abdomen rather short and depressed, obtuse in the males, pointed in 

 the females ; 5 -jointed, the 2nd frequently ve?'y large. Wings in- 

 cumbent, generally longer than the body, nervures varying (9), some- 

 times short or none. Legs stout, posterior often long. Thighs 

 stout, the middle pair sometimes excepted, posterior in so7ne large 

 and long : tibiae simple, posterior long stout and a little curved : 

 tarsi long and 5-jointed, the basal joint in the posterior always, and 

 sometimes the 2nd also, short and dilated : claws and jjulvilli di- 

 stinct. 

 Obs. The wing represented is from B. silvaticus S- 



Hamatus Hal. MSS.—Curt. Guide, Gen. 1350. 8\ 



Black, shining, sparingly clothed with hairy bristles : antennaa 

 with the seta slightly feathered ; lip ochreous ; eyes reddish 

 brown ; scutellum suhtrigonate ; abdomen with the bastd joint 

 not much larger than the following : wings ample, yellowish 

 fuscous, darkest at the costa, iridescent ; the 5th longitudinal 

 nervure not reaching the margin, nervures brown : halteres 

 ferruginous-ochre : all the thighs thick in the male, the anterior 

 only in the female ; tibiae sometimes slightly ochreous at their 

 base ; tarsi with the basal joint ovate and truncated obliquely in 

 the hinder pair, and dilated, especially in the male, in which sex 

 the 2nd also is stouter than the following : pulvilli ochreous. 

 In the Cabinets of Mr. Holiday and the Author. 



This genus is distinguished from neighbouring groups by the 

 short and dilated basal joints of the posterior tarsi, and seve- 

 ral divisions are formed by differences in the neuration of the 

 wings, and one species is apterous. These little flies are found 



