178 Bl'LLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Eristalis diminutus Walker, List, etc., iii, 622. — Mexico. 



Eristalis expictus Walker, Trans. Enr. Soc. N. Ser., v, 291.— Mexico. 



Eristalis familiaris Walker, Trans. Ent. Soc. N. Ser., v, 200.— Mexico. 



Eristalis fulvipes Bigot, Ann. Soc. Eut. de Fr., l8.-?0, 225.— Mexico. 



Eristalis furcatus Wiedemann, Auss. Zw. Ins., ii, 176,34.— Brazil, Columbia, Yucatan. 



JC. fimoratns Mactiuart, Dipt. Exot., ii, 2, 40, 1.5 ; tab., ix, fig. 6. 

 Eristalis guadalupensis Macquart, Dipt. Exot., ii, 2. — Guadeloupe. 

 Eristalis Gundlachi Loew, Centur., vi, 61. — Cuba. 

 Eristalis impositus Walker, Trans. Ent. Soc. N. Ser., v, 289.— Hay ti. 

 Eristalis lateralis Walker, Linn. Trans., xvii, 347, 42; List, etc., iii, 622.— Brazil, 



Cbili, finiana, Mexico, Jamaica. 

 Eristalis mexicanus Macquart, Dipt. Exot., 2" Suppl., 59, 54.— Mexico. 

 Eristalis pachypoda Bigot, Ann. Soc. Ent. de Fr., 1880, 224. — Mexico. 

 Eristalis pusio Wiedemann, Anss. Zw. Ins., ii, 192; Eoder, Stett. Ent. Zeit., 1885, 



:!41.— Pcu-to Rico. 

 Eristalis Sackenis Bigot, Ann.Soc.Eut.de Fr., 1880, 224. — Mexico. 

 Eristalis semicirculus Walker, Dipt. Saund., 249. — Honduras. 

 Eristalis Soulouquensis Bigot, Ann. Soc. Ent. de Fr., 1880, 228.— Hay ti. 

 Eristalis testaceicoriiis Macquart, Dipt. Exot., 4« Suppl., 138, 62. — Mexico. 

 Eristalis tricolor .Jiennicke, Neue Exot. Dipt., 92.— Mexico. 

 Eristalis unicolor v. d. Wulp, Tijdschr. v. Entom., xxv, 131.— Guadeloupe. 

 Eristalis hasihiris Macquart, Hist. Nat. Dipt., i, .502, 4.— North America. 

 Eristalis inflatns Macquart, 1. c, 507, 18. — North America. 



" I did not hud the types of these species either in Lille or in Paris, and the descrip- 

 tions do not apply to any of the known species." (O. Sackeu, Cat. Dipt., 133.) 

 Eristalis everes Walker, Dipt., Saunders., 246.— North America. 



Osten Sacken could not find the type of this species in the British Museum ; the 

 description will not permit identification. 



DOLIOSYRPHUS.* 



Doliosyrphns Bigot, Bullet. Soc. Ent. de France, No. 13, 1882. 

 ? Priomerus Macquart, Hist. Nat. Dipt., i, 511, 1834. 



Allied to Eristalis, but differs chiefly in the structure of the head and 

 abdomen. Large, black and yellow, thinly pilose species. Head large, 

 globose. Eyes pilose. Frontal triangle of the male large, projecting, 

 in profile forming an obtuse angle near the middle. Antennas small, 

 arista bare. Abdomen broadest at base of second segment ; narrowed 

 to the tip of the fourth segment, concave on the sides, the tip of fourth 

 segment less than a half of the width of the second segment. Hind fem- 

 ora much swollen and elongate, hind tibia? compressed and arcuate. 

 Otherwise as in Eristalis. Type of genus J), scutellatus Bigot. 



This description is drawn from males of D. Eileyi. 1 have seen three 

 other species from Mexico, all agreeing essentially in these characters, 

 and I believe the genus is a well-founded one. 



Doliosyrphus Rileyi, n. sp. (Plate VIII, fig. 8.) 



Habitat. — New Mexico! 



<?. Length, 14 to 15™™. Eyes pilose. Antennae blackish brown; arista 

 thin, bare. Face concealed beneath dense gray pollen, on the sides 

 * Ao/ltof, deceitful; a-Optpog, a small winged insect. 



