160 CATALOGUE OF DIPTERA 



Inhabits duck-meat {Lenma) on the surface of ponds early in 

 the spring, skipping very actively in small troops, and scarcely 

 to be taken without sweeping up the surface of the water. 



H. fontinalis. Olivacea, subtus schistacea, thorace vittato^ 

 pedibus luridis, alls obscuris maculis trtbus testaceis. 



Size of the last, which it greatly resembles : hypostoma silvery : 

 antennae black : legs dark red : fore thighs at the base dusky, 

 glossed -mih. grey : beneath their apex in the male is a tuft of 

 hairs : front and thorax deep olive, the last with two chesnut 

 stripes, divided by a pale line : underside slate grey : the blackish 

 indented band down the back of the abdomen is narrower than in 

 the preceding : hypopygium as in the last reflected forcipate, with 

 a long bristle rolled up spirally at the end : wings dusky, the rib 

 and nervures of the tip bordered with a deep tinge : the small 

 transverse nervures of the base bordered with deep brown : another 

 spot surrounds the fork of the apical nervure, and a third includes 

 the ordinary transverse nervure : these markings are rather diffused 

 and cloud-hke, but deeply coloured. 

 Inhabits the shady beds of small rivulets in summer, but is 



rare. 



Leptosceles. {Genus Heleodromice proximum.) 

 Caput nutans, ellipticum : oculis magnis, ovatis, approximatis : hypo- 

 stoma lineare attenuatum : proboscis brevis crassa palpis incum- 

 bentibus : antennae articulo primo minuto, tertio ovato compresso : 

 apice seta longissima : pedes graciles : coxis anticis elongatis : alae 

 incumbentes areola media completa. 



L. guttata. Nigra, nitida, linea dorsali albomicante, alls 

 fuscis, 2)ostice albo guttatis ; pedibus testaceis. 



Hemerodromia irrorata. Meig. III. T. 23. Fig. 11. ala. 



Face silvery : thorax brassy, with a glossy white line down the 

 middle, and other markings at the sides and in front : nervures of 

 the wings nearly as in Heleodromia stagnalis ; but the oblique 

 apical nervure is connected with the preceding by a small trans- 

 verse one, and the wings are narrower at the base ; their colour 

 varies from dusky cinerous to deep ferruginous : the costal margin 

 has no spots : between the forks of the apical nervure is a round 

 white spot, two more between the 3d and 4th longitudinal, and 

 one between the 4th and 5th near the margin ; these 4 are placed 

 in a lozenge form : the remaining spots of the hinder area are less 

 conspicuous. (Length .12.) 



