Prosena. 273 



dark; veins brown, apical cross-vein curved strongly outwards above 

 the angle. Squamulæ brownish yellow. H alteres yellow. 



Female. Similar; frons broad; pruinosity on abdomen generally 



grey. 



Length 8 — 12 mm. 



D. caninum is common in Denmark all over the country on 

 suitable localities; the dates are ^7 — ^g. It occurs on leaves of bushes 

 and in low herbage at and in woods, especially in shaded damp 

 piaces. It is known to be parasitic on larvæ of Melolontha. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden, Lapland and Finland. 



54. Pposena St. Farg. et Serv. 



Species of medium size, greyish or yellowish grey pruinose, 

 with large yellow side spots on abdomen in male. Head a little broader 

 tlian thorax, flat beliind and slightly puffed out below, much higher 

 than long. Frons somewhat narrow in male, broader in female, some- 

 what protruding. Jowls about half the height of the eye. In both 

 sexes ocellar and inner vertical bristles, and in female two orbital 

 bristles. Postocellar bristles irregular, but occipital bristles distinct. 

 Behind postocular bristles no black hairs. Frontal bristles reaching 

 just to insertion of antennæ, all crossing in male, in female an out- 

 wards directed bristle above. Gheeks bare. Vibrissal ridges almost 

 not converging below; vibrissæ not ascending. Epistoma almost 

 not retreating, slightly reflected below, with a strong but not sharp 

 middle carina with a slight middle furrow. Oral cone not long; clypeus 

 linear, yellow; proboscis long and thin, about as long as the body, 

 labella small, linear. Palpi small, somewhat rudimentary. Antennæ 

 inserted below middle of the eye, third joint fully thrice as long as 

 second; second with a very long bristle; arista long-plumose. Thorax 

 a little rectangular; three postsutural dorsocentrals and a middle 

 præsuturai and a præscutellar pair of acrostichals. Scutellum with 

 three marginal bristles on each side. Two sternopleural bristles. 

 Pteropleura with yellow hairs and a couple of black bristly hairs 

 above. Abdomen elongated conical, in female broader and oval; 

 excavation on second segment reaching hind margin; only marginal 

 bristles present, on second segment a pair; also on fifth segment 

 only a marginal row. Legs long, especially tarsi long with elongated 



18 



