174 MUSCIDjE. 



5. scabricula, Hal. E. M. iii. 820. 5 (1836). Castaneo-fusca, 

 abclomine nigro. Long, f ; alar. 1 lin. 



Head and thorax chestnut-brown, opaque, very thickly shagreened, and 

 set with minute white points, lying fiat. Head very long. Eyes small. 

 Arista whitish. Teeth of the scutellum very short, decurved. Wings 

 whitish-hyaline, with pale ferruginous veins, shorter than in S. denti- 

 cnlata ; costal vein brown ; rib finely ciliate. Abdomen black. Legs 

 short, set with very minute whitish bristles, light brown; knees and 

 tarsi paler ; hind femora of the male not thickened ; tarsi very short ; 

 hind metatarsus as long as the next three joints together. 



Rare. In Mr. Holiday's collection. (E.) 



Genus II. BORBORUS. 



BORBORUS, A. C. et B., Meig. Borborm et Apterina, Mcq. ; Hal. 

 Sphcerocera, Nerea, et Mycetia, Desv. Copromyza p., et Limosina p., 

 Zett. 



Arista pubescens, quasi exarticulata. Frons et scutellum setigerte. Areola 



analis completa. Vena discalis transversa alee margini proxima. 



Front less produced than in Sphasrocera, some long bristles bordering 

 tJie frorftalia ; face longer. AntennaB obliquely advanced ; arista pu- 

 bescent, the basal joint very minute. TJtorax smooth ; scutellum short, 

 with a pair of bristles at the end. Anal areolet of the wing and the 

 small one before it complete; transverse veins remote, the discal one 

 being close to the border, and the pobrachial vein scarcely, if at all, 

 continued beyond it ; cubital and prsebrachial veins not approaching. 

 a. Wings and halteres developed. 



b. Hind tibiae armed with a spur. 



c. Middle tibia3 bristly on the outer side. Species 1-3. 



c c. Middle tibiaa hardly bristly on the outer side. Species 4-8. 



b b. Hind tibiae without spurs. Species 9. 

 a a. Wings and halteres rudimentary. Apterina. Species 10. 



1. nitidus, Meig. Zw. vi. 201. 4 (1830); Desv.; Mcq.; Hal. 

 E. M. iii. ; Zett. hamatus, Hal. E. M. I. ; Curt. Niger, nitidus, hal- 

 teribus albidis, alis ferrugineis, maris femoribus posticis basi uncinatis. 

 Long. 2i ; alar. 5 lin. 



Shining-black. Frontalia dull-black. Palpi not dilated. Thorax 

 with a brassy tinge. Wings rust-yellow; veins brown; transverse 

 veins often darker. Halteres whitish. Segments of the abdomen nearly 

 equal in length. Legs hairy ; posterior coxse, trochanters, and knees 

 sometimes rust-brown ; middle tibia with a row of long spines down the 

 outside. Male. Abdomen with two filiform appendages beneath. Femora 

 very thick; fore pair serrate below; hind pair longer, curved, armed at 



