G4 



(1^) Eristalis flaoipcs Sjn. Milesia harcla Say 2 (non 5 ). The original type 

 of Say's is still preserved in the Harris collection in Boston. This synonymy 

 explains the brown spot on the wings of the female, mentioned in Say's descrip- 

 tion, and which does not exist in the real female of M. barda. 



(^^) Eristalis trifasciatus Say (1829), seems to agree exactly with E. trans- 

 versus Wied. (1830), and if it was not for the discrepancies in the description 

 of the head and of the hind femora, I would not hesitate to unite both species. 



(13) HelopJdlus. Compare the paper on the European species of Helopliilus 

 by H. Locw, in the Stett. Ent. Zettschr. , Vol. VII ; several North American 

 species are described in it. 



{}*) HelopMlus ohscurus. Strange as it may appear that a species originally 

 described from the Carolinas should be a common species in very northern 

 localities or at high altitudes in the Rocky Mountains, such seems nevertheless 

 to be the fact. I communicated some of these northern specimens to Dr. Loew, 

 who identified them with his E. ohscurus. 



C-^) Eristalis decisus Walker. I saw the specimen in the British Museum 

 in 1859, and noticed that it was a HelopMlus with a greasy thorax, the yellow 

 stripes of which were almost invisible. I did not, at the time, take note of 

 the species, but the description agrees with the common H. similis. 



/i6) The synonymy does not seem doubtful ; only Hinterrand should be read 

 instead of Seitenrand in the description ; without this emendation the com- 

 parison with U. pendulus has no sense. 



(1^) Teucliocnemis. Milesia Bacuniius 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 in the middle (like 

 the male of Mallota posticata), a character which is wanting in Pterallastes 

 thoracicus Loew. Tlie latter was described by Dr. Loew in both sexes, and 

 therefore must he considered as the type or 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. 



(18) Teucliocnemis Bacuntius. The s-pecimens which I have from Texas do 

 not quite agree with Mr. Walker's description of the thorax. 



(1^) Xylota fjuncida Say. I am not sure whether I am right in identifying 

 this species with the one which is most common in New England, and agrees 

 with Say's description, except that the antennae are more often dark than red- 

 dish ; that the tarsi usually have the three last joints black, rarely two ; the 

 hind coxae in the male are armed with a spine. This last character prevents 

 me from identifying this species with Xyl. quadrimaculata Loew. I have not 

 seen any original specimen of the latter. Loew seems to have identified ejun- 

 cida, as appears from the note in Centur. VI, 56. 



(2 0) On the European species of Eumerus, compare Loew, Stett. Ent. Z., 1848, 

 and again Verb. Zool. Bot. Ver., 1855. 



(21) On Chyrysochlamys compare Loew, Verb. Zool. Bot. Ver. 1857. 



{^-) Spilomyia. Compare Loew, Centur. V, 33, Xotn; but insert the word 

 non be f pre clausd. 



