11. CHORISOPS 213 



but not on the other. I cannot consider it at all closely allied to any 

 European species, but it is very near the North American B. anmdifera 

 Bigot according to the original specimens which I possess (four females) ; 

 B. annidifcra however has a slightly but distinctly wider frons in the 

 female, and has the base of the third antennal joint ferruginous, while the 

 eyes are more pubescent and the legs and wings appear to be slightly 

 darker. In many respects it indicates a tendency towards a relationship 

 with Chorisops tihialis. 



B. Morrisii cannot be considered at all a common British species 

 though I know of numerous and widely spread localities ; these localities 

 are mostly on the south and west as they are in Cornwall (Boscastle), 

 Devon (Lynton), Dorset (Charmouth, the original locality), Somerset 

 (Porlock), Sussex (Guestling), Surrey (Clandon), Hereford (Cusop, 

 Ledbury), Merioneth (Dolgelly, Barmouth), North Wales, but they extend 

 to Aberdeenshire (Ballater), and Elgin (Logic). The dates range from 

 June 17 to August 6. It is known to occur from England and South 

 Sweden to Austria and Italy, and has been recorded by van der Wulp 

 from Quebec. 



Syiioiiymy. — I have come to the conclusion that it is not advisable to suggest 

 any alteration to the accepted synonymy, which simply admits B. Morrisii Dale 

 (1842) as the only prior name for B. pallipes Loew (1846). It is unfortunate that 

 neither Dale nor Loew referred to Macquart's B.flavvpes (1826), as that name alone is 

 almost a description, but Loew sank Macquart's species as a synonym of B. 

 chalyheata and only referred to B. ohscura Meigen (1820) as possibly representing 

 his B. pcdlipes. I am afraid to revive Macquart's name of B. JIavipes, even though I 

 believe the present species was intended, because the description is not sufficiently 

 clear, and if a change were begun it would open the door to a possible revival of 

 Meigen's B. ohscura. Under all the circumstances I prefer to accept the certain 

 name of B. Morrisii rather than any uncertain name, even though I do not consider 

 that the Rev. F. O. Morris was a naturalist worthy of such acknowledgment. The 

 solitary exponent of B.flavipes in Bigot's collection was a small female B. Morrisii, 

 which apparently had been named for him by Rondani ; Bigot however had five 

 males of B. Morrisii under the label of B. chalyheata and one male (apparently from 

 Rondani) under the label of B. sexdentata. 



11. CHORISOPS. 



Chorisops Rondani, Dipt. Itah Prodr., i., 173 (1856). 



Closely allied to Beris, but distinguished by the long palpi 

 and the separated eyes of the male. It agrees with Acti?ia in 

 these two characters, but is distinguished by its bare eyes. 



Head with the eyes bare in both sexes and well separated down the frons 

 (fig. 1 52) ; space above the antennae glistening white. Palpi about as long as the 

 proboscis. 



Scutellum with four yellowish marginal spines. 



Abdomen usually with yellowish markings on the disc. Genitalia of the male 

 distinct from the abdominal segments, and apparently connected with them by a sort 

 of neck. 



Legs with the hind tibiae incrassated after the base, especially in the male. 



Wings (fig. 151) difi"ering in many minor points from Beris, though the character 

 of the incomplete third veinlet from the discal cell is not a strong one, as it often 

 occurs in Beris Aforrisii. Cubital vein ratJier undulating, with its short upper fork 

 beginning at tAvo-thirds of its length ; upper branch of the postical vein forming the 

 lower inargin of the discal cell for neaidy half tlie length of the cell. 



