NOTES. 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 unrecognizable fragment 



207 Syrphus lapponicus. Whether this is a variable species or a 

 group of closely allied species, I do not pretend to decide; see about 

 it in my paper on Syrplnifi, but strike out whatever is said there about 

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



208. Syrphus arcucinclus Walker, List, etc. Ill, 580 (Huds. B. Terr.) 

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

 S. (niutl<>i>is; the other belongs to the group of S. lapponicus. The 

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

 S. aiiinlo^tis being much more than ,,slightly curved". 



209. Syrphus plaladelphicus Macq. and Scaeva concara Say are 

 synonyms of either S. ribcsii or S. forms. The type of the former in 

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

 fn<s in Wiedemann's collection in Vienna is S. ribcsii. - - I have no 

 doubt now of the identity of 6'. ribesii with my S. rectits. Mr. Novicki 

 (in his Beitr. z. Dipterenfauna Neuseelands, 1875), published another 

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



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

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

 American umbellatarum. 



211. Syrphus adolescens Walker, List, etc. Ill, p. 584 (Huds. B. 

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

 one belongs to the group of S. lapponicus; the other (from N. Scoti.i) 

 is S. ri)iuriciiu.s; the third is my S. coiituwax. The description was 

 probably drawn from the latter, although it is very unmeaning 



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

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

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



Didea laxa 0. Sacken S ? 1! 'H- Huff- Soc. 1. c.). 



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

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

 1113 mm. 



Female. Face yellow, with a broad, brown stripe, front and 

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

 black. Thorax blackish-green, shining. Scutellum dull brownish-yellow, 

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

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

 with a similar spot in the middle 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 (on segments 3 and 4) have a triangular notch 

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

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

 in contact with the abdominal margin with less than their greatest 



