KOTES. 245 



mens, only the ..four interrupted gray bands", mentioned in it, were not 

 seen by me. 



206. Syrphus geniculatus. The type in the Jardin des Plantes is 

 an unrecognizalile Iraciiiciit 



207 Sjrphus laponicus. Whether this is a variable species or a 

 group of closely allied sj)ecies, 1 do not pretend to decide; see about 

 it in my paper on Si/rpliKft, but strike out whatever is said there about 

 the synonymy with S. affinis Say. The latter, as I recognized since, is 

 Cutahoniha jnfra^fyi. 



20i(. Syrphus arcucinctus Walker, List, etc. IIT, 580 (Iluds. B. Terr.) 

 is represented in the Brit. Mas. by two specimens, one of which is my 

 S. amcdopis; the other belongs to the group of *S'. lapponicus. The 

 description is drawn from the latter specimen, the abdominal spots of 

 S. amahpift being nnich more than ,. slightly curved". 



209. Syrphus pbiladelphicus Macq. and Scacva concava Say are 

 synonyms of either (S*. ribesii or tS'. torrioi. The type of the former in 

 the Jardin des Plantes is a very much soiled specimen. — The S. con- 

 caviis in Wiedemann's collection in Vienna is S. rihcfiii. — I have no 

 doubt now of the identity of S. ribeftii with my S. redufi. Mr. Novicki 

 (in his Beitr. z. Dipterenfauna Neuseelands, 187.5), published another 

 Syrphus rectus, in the very year of the publication of mine. 



210. About S. guttatus Walker, Mr. Verrall writes me that it 

 resembles toDhilkdaruni; hence I place it as a doubtful synonym of the 

 American itmhcUctnrum. 



211. Syrphus adolercens Walker, List, etc. Ill, p. 5S4 (Huds. B. 

 Terr, Nova Scotia) is represented in the Brit. Mus. by three specimens; 

 one belongs to the group of S. lapjpjonkus ; the other (from N. Scotia) 

 is S. amcricanus ; the third is my S. coutumax. The description was 

 probably drawn from the latter, although it is very unmeaning 



212. Didea fuscipss. Differs from the European D. fasciata in the 

 color of the legs only (Lw. Cent. IV, b2). D. luxa with its greenish 

 color, is the representative of the European D. alneti. 



Didea laxa 0. Sacken $ £. Bidl. Buff. Soc. 1. c). 



The greenish or yellow cross-bands are attenuated on the sides and 

 come iu contact with the lateral margins of the abdomen. Length : 

 11-13 mm. 



Fdiiale. — Face yellow, with a broad, brown stripe, front and 

 vertex black; the former with gray dust on both sides. Antennae 

 black. Thorax biackish-grccn, shining. Scutellum dull brownish-yellow, 

 with a slight greenish or bluish metallic lustre pleurae with a whitish 

 spot, bogiiining at the humerus and connecting almost at right angles 

 with a similar spot in the nuddle of the pleura. Abdomen black, with 

 two greenish yellow or yellow spots and two cross-bands; the spots (on 

 the second segment) are large, oval and in contact with the lateral 

 margin; the cross-bands ion segments 8 and 4) have a triangular notch 

 or excision on their hind margin (in some specimens they are altogether 

 interrupteill; on each side of the notch they are convex, so as to come 

 iu contact with the abdominal margin with less than tluir greatest 



