218 FMarch, 



usually of a shining black colour ; the males have large contiguous eyes which 

 nearly cover the whole cheeks ; the thorax is mostly immaculate, but in the less 

 deeply coloured specimens three wide black bands may be observed on a brown 

 ground ; the abdomen is flat and tapers towards the extremity, when viewed from 

 behind it is grey, having often a glaucous tinge, and is marked with a black longi- 

 tudinal sub-continuous dorsal band, and with straight transvei'se lines ; the wings 

 are usually somewhat fnsoous, having the third and fourth longitudinal veins rather 

 widely separated, and slightly divergent from each other ; the external transverse 

 veins are straight and upright ; the hind tibiae of the males are bare on their inner 

 sides. 



The female is grey, with the thorax and abdomen indistinctly striped ; the eyes 

 widely separated, and the intra-ocular space black, with broad whitish margins. 



P. CEPETORUM, Sp. 11. 

 Mas, grise%is,thorace siihlineato ; abdomen lineare, depressum, cinereum, albo- 

 nitente, linea dorsali nigra, interrupta, signatum ; aim clarcB ; tibia posticcB intus 

 parce setosee. 



Femina, oculis remotis, abdomine immaculato, apice acuto. 



Long. S et ^ , 6 mm. 



This species very closely resembles Hylemyia antiqna, Meig., and has doubtless 

 been confounded with it. The chief points of difference between the two species 

 are, that the arista is only pubescent in P. cepetorum, but sub-pluraose in R. antiqua ; 

 the abdomen is marked down the dorsum with an interrupted stripe in P. cepetorum, 

 while there is a fine continuous line in S. antiqua (" ununterbrochener schwarzer 

 feiner Euctenlinie ") ;* lastly, the wings are mostly clear in F. cepetorum, but 

 brown in H. antiqua. 



Head : face slightly prominent ; epistome flat ; eyes of male contiguous ; an- 

 tennae of moderate length, with the arista thickened and pubescent at its base, but 

 nearly bare in the middle and at the extremity. 



Thorax, with the scutellum of a light yellowish-grey colour ; the former marked 

 with four indistinct pale brown stripes, and with four rows of black bristles. 



Abdomen oblong and rather narrow, cinereous, clothed with black hairs, and 

 showing silvery-white reflections when viewed from behind ; it is marked down the 

 dorsum with a row of elongated, narrow, triangular black spots, which form a sub- 

 continuous stripe ; the anal segment is grey, small and i-ather pointed ; the sub-anal 

 male appendages are large and hairy. 



Wings hyaline, with the third and fourth longitudinal veins nearly parallel to 

 each other, and the external transverse ones straight, and a little oblique ; Calyptra 

 and Halteres both pale yellow ; Legs sometimes piceous ; hind femora almost bare 

 of hairs or bristles at the base of their undcr-surfaccs ; hind tibise of the males 

 furnished with a few short bristles along the middle and upper part of their inner 

 sides. The female is very similar in colour to the male ; the eyes are widely sepa- 

 rated, the intervening space being red at its front part ; the abdomen is dull grey, 

 mostly immaculate, conical and pointed at the apex ;. the calypti-a are white, and 

 the halteres yellow. 



* Meigen. 



