1882.) 209 



H. A>TrQr.\, Meig. 



Tliis rare species, of -n-liieli T have seen but one British example, has been con- 

 founded with several others. It is shortly but clearly described by Meigen (vol. v, 

 p. 160). The thorax is yellowish-grey with white shoulders, and is unstriped ; the 

 abdomen is flattened aiid elliptical, ash-grey, with a very fine, straight, sub-inter- 

 rupted dorsal black lino ; the hind tibite arc spinous. I have typical continental 

 specimens of this fly nauied by the late Professor Rondani. 



H. STRioosA, Tab. 



Tliis is common everywhere in woods ; it has the tibiae only piceous in the 

 males, and the femora, as well as the tibise, pale in the females. 



II. NIGEIMANA, Mcig. 

 This species closely resembles the last, but is usually rather larger, and has the 

 four posterior femora of the males, as well as all the tibiae, pale. The females are 

 diflicult to distinguish from those of H. strigosa. Generally distributed, but not 

 common. 



H. PB^POTENS, Wdm. 

 This fine species has all the femora and tibine yellow in both sexes ; the anal 

 segment of the abdomen, as well as the sub-anal male appendages, are also yellow ; 

 the wings have the third and fourth longitudinal veins strongly divergent, and the 

 external transverse veins very oblique and sinuous. Rare. 



H. PUELLA, Meig. 

 This species closely resembles H. virginea, but has all the tibise testaceous, 

 while in H. vh'ginea only the bases of the fore tibiae are pale. These two species 

 are probably only varieties of the same. Rare. 



H. OPEEOSA, Meig. 



This species, of which I only know the female, is characterized by having the 

 thorax, which is brown, marked by two wide irregularly (maculiform) shaped lateral 

 stripes, and two narrow central lines, the sides being cinereous ; the abdomen is 

 conical, grey, and has a central dorsal stripe ; the legs have all the femora black, but 

 the tibiae testaceous in both sexes. The female has the intraocular space black, ex- 

 cept at the front margin, where it is red. Length, 4 mm. (about 2 lin.). 



This fly, which is rare, bears a strong resemblance to Hydrophoria conica, but 

 is much smaller and has little alulets. 



H. COAECTATA, Fall. 



This is a well-marked species ; the arista is furnished with hairs of medium 

 length ; the males have the thorax grey with the sides lighter, and the dorsum in- 

 distinctly striped ; the abdomen hairy, oblong, narrow, flat, and cinereous, with an 

 indistinct narrow dorsal stripe ; anal segment grey, sub-anal appendages hairy, with 

 two black lamellae ; wings with yellow veins ; legs black, with pale tibiic. Tlie 

 females have both the thorax and abdomen pale ash-grey, and inuuaculatc, and the 



