isrc.) 245 



XOTES ON SOME BRITISH DOLICHOPODIDM, WITH DESCRIPTIONS 

 OF NEW SPECIES. 



BY G. H. VERHALL. 



(continued from page 198.) 



The species of the genus Chrysotus are some of the most difficult 

 to distinguish iu the whole of tlie DoJichopodidce. In my list of 1872, 

 I only recognised four British species (C. Icesus, cupreus, gramineus, 

 and neglectus). I can now distinguish, with more or less certainty, 

 ten species, chiefly by the help of a recent monograph of the European 

 species by Kowarz, in Verh. zool.-bot. Ges. Wien, xxiv, 187-i. He 

 seems to find the species very difficult to group, and is obliged to 

 form a separate table for each sex to distinguish the species. His 

 material consisted of sixteen species, in all of which he knew the male, 

 but in four of which he knew that sex only. His first division in 

 the males comprises two species only, which have the femora almost 

 entirely yellow ; both of these occur in Britain ; they are : — 



CHBYSOTrS NEGLECTUS, AVicd. 



A species well distinguished in the male sex by its entirely yellow 

 femora, large size, and black-haired front coxa? ; the female is very 

 variable in the colour of the legs, but maybe distinguished from allied 

 species by its rather larger size, black-haired front coxae, yellowish 

 hind trochanters, rather small third joint of the antennae, and entirely 

 yellow hind til)ife ; the femora vary from almost entirely yellow to al- 

 most entirely black. 1 have caught it at Footscray, Penzance, Upware, 

 and near Southend, in June and July, but have never found it 

 common. 



C, CILIPES, Mg. 



This species may be known in both sexes by its small size, bright 

 green colour, yellow femora, the hind pair with black tips, and 

 yellow-haired front coxa;. It is correctly recorded in Walker's lusecta 

 Britaiiiiica as not rare ; but, as I had never seen a specimen when I 

 published my list, I ouiitled it. I have since caught it in great 

 ubundance iu some marshy meadows at ]3eaulicii, in tlio New Forest, 

 and at Upware, besides a few specimens in other localities. 



From the fourteen species left with chiefly black femora, Kowarz 

 separates two which have the hind trochanters yellow; I find, how- 

 ever, nearly all the species with the hiud trochanters more or less 

 brown or yellowish, but the one which I recognize of his group, has 

 the hind trochanters and base of femora conspicuously yellow, which 

 is never the case with the others. 



