1873. 285 



13. Chilosia olitacea, Zett. — Amongst some British. SyrpMda; of 

 Mr. r. "Walker's, I found a male specimen which I am inclined 

 to refer to this species, of which the following diagnosis gives 

 the principal characters. ^■. olivacea, oculis Tiirtis ; epist ornate 

 hlrto, descendente ; antennis f usco-uigris, seta sub-nuda ; sciofello 

 pilis vaJidis nigris ; ahdomine oblongo, seneo, luteo liirto ; pedihus 

 nigris, tibiis anterioribus basi fidvis ; aluJis flavidis ; alls inf us- 

 catis. Long. 4| lin. 



It resembles pigra, but is distinguished by its smaller, more 

 defined epistomal knob, on the sides of which the erect hairs are 

 paler ; by the shorter and blacker pubescence of the thorax and 

 scutellum ; by the pale yellow alulae, with luteous edges and 

 fringes, which, in pigra, are reddish-brown with brownish fringes ; 

 by the luteous, instead of black, pubescence at the end of the 

 third and fourth abdominal segments ; and by the absence of any 

 chestnut hue on the second joint of the antennae. 



From melanopa, according to Loew's description, it would 

 differ by its larger size, less prominent front, and by the absence 

 of any black hairs on the hinder half of the fourth abdominal 

 segment, and on the genitalia. Zetterstedt describes the kneea 

 in his diagnosis as whitish, but in his description testaceous. 

 This species has hitherto only been recorded fi'om Scandinavia. 



14. Chrtsochlamts EmcoKNis. — Among some Diptera collected by 

 the late Mr. Dossetor, and given to me by Mr. E. W. Janson, 

 was a pair of this species, which has been found over most of 

 Europe north of the Alps, and therefore might be expected to 

 occur in England. It is very similar to G. cuprea, but is 

 usually rather smaller and narrower, with redder antennae, and 

 more especially with a red or reddish arista ; the dull fasciae on 

 the abdomen are broader, especially in the middle, and placed 

 just before the hind margin of the segments, leaving the hind 

 margin itself shining ; the scutellum is more yellow-haired, and 

 the tibiae bear no short black setae, as in C cuprea. 



15. Xylota confinis, Zett. — This species is allied to the common 

 X. srgnis, L., but is usually smaller, the red portion of the abdo- 

 men is more yellowish, with more or less black about the junction 

 of the second and third segments, and on the disc of the second 

 segment, and it also bear traces of whitish reflections about the 

 sides near the base of the abdomen, and on the sides of the 



