250 NOTES. 



different from a typical E. transversus, but nevertheless I believe it to 

 be the same species. 



E. vittatus Macq. The description agrees with E. transrersus, ex- 

 cept that the eyes are said to be glabrous. Hut this statement is very 

 probably erroneous, as, with the exception of E. aenais, all the known 

 N. A. Eristalis have pubescent eyes. 



E. pumilus Macq., seems to be based on a very small specimen of 

 E. transrersus, in the variety with yellow anterior legs. I have not 

 seen the type in Paris. 



230. Eristalis Acdroclus, frater, chalcpts Walker, which I have seen 

 in the Britisch Museum, are Hilopliili of the group of H. lorcalis, 

 (li-ornla)i(liats, ylacialis. As it was not possible for me to determine 

 their synonymy, I have omitted them in the lists. 



231. Plagiocera being preoccupied by King, (Hymenoptera 1834), 

 Mr. Loew gave another name to this genus. It was, I suppose an over- 

 sight on his part, that he omitted to state that Pteroptila was merely a 

 new name for an old genus. Schiner (Novara, 366) was right in su- 

 specting it. 



232. Helophilus. Compare the paper on the European species of 

 Helopltilus by H. Loew, in the Stett. Ent. Zeitschr. , "Vol. VII; several 

 North American species are described in it. 



233. Helophilus stipatus and H. Anausis Walker. I saw both in 

 the Brit. Museum. The former, I thought, was Hd. lineatus male. Tito 

 latter, a greasy specimen, was undistiuguishable , but the desciiption 

 shows it to be H. It-mains. 



234. Helophilus obscurus. The patria as given by Mr. Loew in the 

 Centuries (Carolina), was based upon an erroneous reading of the label. 



235. Eumerus porcus Walker, which is a Helophilus, is a very 

 peculiar species ; it is represented in the Brit. Mus. by two ( <J and !? ) 

 wellpreserved specimens. I have never seen it elsewhere. 



236. Helophilus susurrans Jaenn. The synonymy does not seem 

 doubtful; only Hi-nh-rraml should be read instead of Seitenrand in the 

 description; without this emendation the comparison with H. pendulits 

 has no sense. 



237. Teuchocnemis. Milesia Bacuntius Walker, and Pterallastes 

 lituratus Loew, are closely allied and must be put in the same genus. 

 Both have, in the male, curved hind tibiae, with a strong projecting 

 spur -i-n tlte middle, a character which is wanting in Pterallastes tJioracicus 

 Loew. The latter was described by Dr Loew in both sexes, and there- 

 fore must be considered as the type of the genus, while of P. lituratus 

 Dr. Loew described only the female. Hence arose the necessity of 

 establishing a new genus for the other two species. 



238. Teuchocr,emis Bacuntius. The specimens which I have from 

 Texas do not quite agree with Mr. Walker s description of the thorax, 

 nevertheless the identity is not doubtful. 



239. Msrodon Bautias Walker, is represented in the Brit. Mus. by 

 a single male specimen; J/. bqxtrtitus by four specimens, two of which 

 seem to be females of M. JJaatias; the two others may be a different 



