Descriptions of British Diptera. 159 



assumes the form of an interrupted white line in the female ; tho- 

 rax shining black, with fine grey pubescence, having a white lateral 

 line on each side extending from the shoulder to the insertion of the 

 wing ; scutellum concolorous with the thorax ; abdomen of the male 

 white, with the base black and a spot of that colour at the apex ; 

 that of the female black margined with white, having a row of small 

 white triangular marks down the middle, and another on each side ; 

 the spots of the latter united to the white margin : thighs black with 

 the apex white, all the rest of the leg of the latter colour, except the 

 hinder tibiae, which are black in the middle ; wings vitreous, the 

 costal nervures yellowish. 3 — 3^ lines. — {Wood-cut, Fig. 1st. $ ) 

 Found occasionally on flowers in marshes and damp meadows from 

 May to August, probably inhabiting most parts of the country. 

 " On Umbelliferae, common in Ireland." — A. H. Haliday, Esq. 



2. Nemotelus pantherinus. 

 Musca pantherina, Linn — Nemotelus marginatus, Fabr Nemotelus pan- 

 therinus, Meig. Zwei. iii. 115, pi. 25, fig. 20, <J. 



Very closely resembles the preceding in its general appearance, 

 but is considerably less, seldom exceeding 2 or 2^ lines. Head of 

 the female without any white mark over the base of the antennae ; 

 thorax pubescent, of a uniform black colour without any white marks; 

 abdomen of the male white, with a black spot just before the apex ; 

 that of the female black, with a single dorsal series of small white 

 spots : thighs black, white at the apex ; tibiae white, with a brown 

 mark before the apex ; tarsi entirely white. 2 — 2\ lines. 



Found with the preceding, but less frequently. " Near London," 

 Stephens's Catal. " Cambridge," Charles C. Babington, Esq. 



3. Nemotelus nigrinus. 

 Nemotelus nigritus, Panzer, Fauna Germ. cvii. 17 — Nem. nigrinus, Fallen, 

 Diptera Suecicce Meig. Zwei. iii. 117. 



Considerably less than either of the preceding ; head shining black, 

 antennae brown ; thorax with a yellow humeral dot, from which a 

 yellow line extends to the base of the wings ; the other parts of the 

 , thorax and the whole of the abdomen shining black in both sexes ; 

 halteres and legs white, slightly tinged with yellow ; thighs black, 

 except at the apex ; anterior tibiae tinged with brown, the hinder 

 pair nearly black. 1^ — 2 lines. 



This likewise has occurred in the vicinity of London and in a few 

 other places. " Bog of Allen ; Connemara ; Holy wood," A. H. Ha- 

 liday, Esq. 



