1891.] 157 



in both sexes, but darker in tlie male ; it is without any Jofinito markings, but very 

 setose, and has the spines seated upon little black spots ; the third segment is on- 

 circled by two transverse rows of bristles, as in M. spini-cincta ; legs black ; calyptra 

 and halteres yellow j wings yellow at the base. Rare. 



M. DisPAR, Fin. 



rujlpes, Mgn. and Macq. 



jiavipes, Mgn. ?, $ . 

 The male of this species is very much like that of the last {grisea), but differs 

 in having yellow palpi, rufous or piceous basal joints to the antenna?, and reddish 

 tibiae, the abdomen also shows dark reflections ; the female closely resembles the male, 

 but has the abdomen lighter in colour, and the coxae, femora, and tibiae entirely 

 yellow. Rare ; in Mr. Dale's collection. 



14.— POLIDEA, Mcq. 



Hareisea, Mgn., Rnd. 



Gen. ch. — Eyes bairy, separated rather widely and equally in some 

 species in both sexes, and. also having the fronto-orbital bristles in a 

 double row ; in other species (according to Meigen) having the eyes 

 of the males contiguous ; antennae with the third joint about twice 

 the length o£ the second ; arista bare ; abdomen ovate, with or with- 

 out discal setae ; wings with the first posterior cell nearly closed, and 

 ending near the tip of the wing, apical cross veins mostly curved at 

 the base, third longitudinal vein spinose. 



P. CEASSITARSIS, Ztt. 



simplicitarsis, Ztt. 



oenea, Ztt., non Mgn. 



rehaptizata^ Rnd. 

 This little bronzed or bright black species (from 5 to 6 mm. in length), the only 

 one recorded as British, closely resembles some of the 3IacquarticB, it differs, how- 

 ever, by having the eyes widely separated, and tlie fronto-orbital bristles in a double 

 row in both sexes ; the sides of the frontalia are glazed and bronzed ; the cheeks 

 are white and bare ; the chin is somewhat rufous and hairy ; tlie arista is bare and 

 thickened for two-thirds of its length ; the thorax and abdomen are of a shining 

 brassy or bluish-black colour, without any white tomentum or reflections ; and the 

 latter has setae (rather small) both on the disc and edges of the segments ; the legs 

 are black, having the fore tarsi a little dilated in the female. The males have the 

 fore tarsi simple, and may also bo known by the shape of the abdomen, which is 

 ovato-cylindrical with the apex thickened, while in the female is is ovate, rather 

 flattened, and pointed. I have selected Zetterstedt's name of crassitarsis in pre- 

 ference to the others, because it is more characteristic than simplicitarsis, which no 

 doubt belongs to the male of tiie same species. The name of cenea was applied by 

 Meigen to some other species, which seems to be now unknown, described as having 

 the eyes contiguous in the male, and the abdominal segments without discal setae ; 

 this was probably a Macquartia. Rare ; the female is more common than the male. 



{To he continued.) 9 i. (^ 



