78 [April, 



Criorrhina oxyacanthx, Mg. — One specimen of this very bee-like fly at 

 Borough, May 26th, 1905. 



Xylota segnis, L. — Scarcely common, July, Angvist; X. sylvanun,!!., once at 

 Borough, July 22nd, 1908. 



Syritta pipiens, L. — Common, July 27th — August 29th. 



Arcto2:>hila mussitans, F. — Several, Twitchen, Borough, Pool, September 

 Kith — 2;3rd, 1909. On the wing this fly is extraordinarily like Bomhus agrorum, 

 and I have been deceived several times. The two insects occur together at 

 Twitclien, on the same day, on the same patch of Ccntaurea nigra, the Bumble 

 bee very common, the fly comparatively scarce — all the classical conditions of 

 Batesian mimicry. 



Sericomyia boreulis, Fin. — Occasionally at Twitchen and Borough, August 

 10th— September 23rd. 



Chrysotoxtmi cautum, Harr. — A <J at Twitchen, August Ith, 1909 ; C.elcgans, 

 Lw., one at Borough, June 4th, 1906 ; C. festivum, L., two at Twitchen, one 

 Warcombe Lane, Jvily 29th — September 12th ; C. hicinctnm, L., a difficult fly to 

 catch ; one at Borough, June 26th, 1906, several at Twitchen, Jvd.y 28th — 

 August 26th, 1909. 



CONOPID^. 



Conops Jlavipes, L. — Scarce; Shaftsborough on Eupatorium cannahinum, 

 August 10th, 1909 ; Twitchen, August 12th, 1908, and August 21st, 1909. Tlie 

 first two specimens strongly suggested "Clear- wing" moths; of the third 

 I noted that during life the movements of the abdomen and a general fidgetti- 

 ness were very like a wasp, but that the insect's antennae remained porrected 

 and motionless. 



Physoccpliala rufipcs, F. — A specimen l)y sweeping, Shaly Hills, July 25th, 

 1908. 



Oncomyia atra, F. — One at Borougli, July 29th, another at Twitchen. 

 August 26th, 1909. 



Sicus ferrugineus, L. — One at Borough, July 2-4th, 1906 ; another, July 29th, 

 1909 ; one at Twitchen, August 12th, 1908. 

 Tachinid^e. 



Echinomyia grossa, L. — Very scarce; two specimens in my garden, Avxgust 

 22nd, 24.th, 1907, a third, August 9th, 1909. This enormous fly in appeai-ance, 

 voice, and manner much resembles Bomhus hortorum, L., var. harriscllus, but 

 I have not yet found the latter in this part of the parish ; E. /era, L., common, 

 July 24th — September 23rd. 



Fahricia ferox, L. — Common, Jvily 18th — Sei:)tember 30th. 



Siphona geniculata, Beg. — Twitchen, two specimens, July 24tli, 1909, one of 

 them the prey of Empis livida, L. 



Alophora hemiptera, F. — This very strange looking fly appears to be 

 extremely local ; I have met with but six specimens, all taken quite close 

 together upon flowers of (Enanthe and Heracleum at Borough, Jiily 29th — 

 August 2nd, 1909. 



Sarcophaga carnaria — Very common. 



