198 [February, 



The luteous hind femora i;vith black tips, the white face and beard, 

 the blackish front femora and white-haired coxse and femora, seem to 

 distinguish this from any British Poiyhyrops, and I believe from any 

 recognized European species. I caught two males at Rannoch, in 1870. 



DlAPHORUS DOHSALIS, n. sp. 



$ ? . ]\Iimitus,nigro-viridis, antennis.pedibns halter'ihusqxte nigris ; fronte 

 lata, facie oris aperturam versus angustata, obscure viridi; antennis hrevi- 

 bus, articulo tertio lato, seta dorsali ; pedibus pubescenfJms ; alis nigri- 

 cantibus. Long. vix. 1 lin. 



Small, dark green ; frons broad, occupying more than one-tliird the width of the 

 head, dull green, rendered lightish by the pale tomentum ; face of the same colour, 

 narrowing steadily towards the mouth, being there only about a quarter the width 

 of the vertex, the space between the eyes, therefore, from the vertex to the 

 mouth forming a blunt-ended triangle ; antennae short, the third joint being about 

 three times broader than long (similar to that of Chrysotus Icesiis), the minutely but 

 densely pubescent arista arises from about the end of the upper fourth, thus 

 appearing distinctly dorsal ; palpi dark brown. Thorax and scutellum green, ren- 

 dered dull by tomentum, the bristles all black. .Abdomen green, somewhat shining, 

 with black bristles, and the usual long bristles at the tip on the hypopygium. Legs 

 black, with abundant small black bristles, and scattered longer bristles, the pulvilli 

 whitish-yellow, considerably elongated on the front pair, less so oii the hindmost 

 pair. Alulae with blackish edge and cilia, halteres black. Wings with a strojig 

 blackish hue and black veins, the discoidal runs parallel to the cubital, or even di- 

 verges slightly from it at the tip, and bears no signs of any flexure ; the lower 

 cross-vein is about two and a half times its own length from the end of the postical 

 vein. 



? . Face and frons almost of equal width all the way down, only slightly nar- 

 rowing towards the mouth, face dull green with a faint whitish tomentum, arista 

 Btill more evidently dorsal. One specimen has the hind tibiae and tarsi brownish. 



As each new species is discovered and described, the boundaries 

 between the genera Diopliorus and Chrysotus seem to grow fainter. 

 Diupliorus melancholicus, Lw., described in 1S69, is the nearest ally to 

 D. dorsaUs, but seems to have the antenna; with a smaller roundish 

 third joint, and a more blackish-green abdomen, besides being described 

 as one line long, while D. dorsalis is distinctly less than that. The 

 only characters I can detect separating D. dorsaJis fi'om the genus 

 Chrysotus are the elongated pulvilli of the male, and the more distinct 

 bristles on the hypopygium ; I see no character to separate the females. 



One ^ and two ? at Woking, on August 1st, 1875, near the banks 

 of the canal. 



(To he coniinuedj. 



