DIPTEROUS TRIBE OF SPILE ROCERID.E. 3 L 23 



BB, Tibiae mediae absque setis literalibus. 

 Sp. 4. B. equinus. Arista subnuda; abdominis segmento 



2 io . maximo ; tarsis posticis brevibus ; mas, metatarso an- 



tico inermi. 

 Copromyza equina . . . Fallen. Heterom. 6. No. 2. 

 Borborus equina .... Meig. VI. 201. No. 5. 



.... Macq. S. aB. II. 566. No. 2. 



Sphaerocera communis, fuli- )Rob. D. 807. Nos. 1, 2. 808. 



ginosa, coprivora ? . . ) No. 3. 



Arista with very thin and short pubescence : 2d segment of the 

 abdomen much larger than the 3d : legs rather short ; first joint 

 of fore feet not unguiculate in the male ; the middle tibiae have 

 a few bristles on the outside, but so short as to be scarcely visible : 

 the hind feet are short and broad ; the first 2 joints broader ; 

 the 3d nearly quadrate ; the 4th transverse : the small cross 

 nerve is placed a little above the middle of the long discoidal 

 cell : varies much in colour : the larger individuals (a) usually 

 have the cheeks, face, and fore margin of the front rufescent : 

 the frontals opaque, black or dusky : the orbits, frontal triangle, 

 and thorax, shining brassy brown ; the last with 4 dusky lines : 

 the abdomen in the male is incurved behind, with the terminal joint 

 not much thickened : the last ventral emarginate, with prominent 

 angles : the legs are testaceous ; the knees and fore feet, and the 

 first 2 joints in the hind pair, dusky : in the male the fore thighs 

 are black, with testaceous tip : poisers whitish : wings brownish 

 hyaline ; the cross nerves sometimes darkened : smaller indivi- 

 duals are sometimes (/3) glossy black : a very narrow margin of 

 the front rufescent : frontals opaque : thorax without lines ; 

 abdomen of the male more thickened at the end ; the ventral 

 segment entire : poisers light brown or pale. In others (o) the 

 base of the shanks becomes rust brown or testaceous ; and again 

 (y) this colour spreads over the entire hind pair : even the diffe- 

 rence of form in the abdomen is not permanent. (Length \\ to 

 2g ; wings, 3 to 5 lines.) 



Everywhere; the most abundant species of this tribe, swarm- 

 ing about cattle yards. 



Sp. 5. B. nigrifemoratus. Arista subnuda ; abdominis 

 segmentis subcequalibus ; niger nitidus ; f route pedibusque 

 testaceis,femoribus ant ids, in mare omnibus nigris ; me- 

 tatarso antico maris inermi. 



