18"2 BILLKTIX :!1, UNITED STATES NATIONAL MUSEUM. 



Two specimens (G. F. Gaimier). 



This si)ecies chiefly ditters from P. crucigera iu its more yellowish- 

 reddish color throughout (most noticeable in the abdomen, facial stripe, 

 hind femora, etc.), in the yellow polliuose spots of the first abdominal 

 segment being united, and iu the female abdomen being less narrowed 

 behind. 



Pteroptila cincta. 



Almca cincta Drury, lus., i, 109; pi., xlv, fig. (i. 



Syrphus piiifftm Fabricius, Syst. Ent., 76:?, (>; Ent. Syst., iv, 262, 16. 



EristaViH pinguis Fabricius, Syst. Antl., 233, 6; Wiedemann, Aires. Zw. Ins., ii, 



193, 61. 

 Milesia Ania Walker, List, etc., iii, 564 ; Macquart, Dipt. Exot., .'ler Suppl., 94, 9. 



Habitat — San Domingo! 



9 , (J . Length, 17 to 19""™. Black. Eyes of male broadly contiguous. 

 Front of female black, shining, narrowly white pollinose on the sides 

 below. Cheeks and a broad facial stripe shining black; the sides of 

 the face densely white pollinose and thinly white pilose. Antennge black. 

 Posterior orbits white i)ollinose and pilose. Thorax opaque black, with 

 bright yellow markings of short dense pile, as follows: Two rounded 

 spots on the front margin, one on each side at the outer ends of the 

 transverse suture, coalescing with larger one on the mesopleurse, one of 

 longer pile on each post alar callus, connected by a transverse one in 

 front of the scutellum. Tegulte light yellow, fringed with yellow pile. 

 Scutellum deep brownish-red, black at the base. Abdomen opaque 

 black, sometimes tinged with red ; second segment with a pair of large, 

 deeply opaque, red triangles ; third segment in front with an entire 

 cross-band of bright yellow pile, very slightly emarginate in the middle 

 behind ; fourth segment with a small spot on each side of the same col- 

 ored pile; iu the female a small triaugle on the third segment behind, 

 two-thirds of the fourth segment, and the fifth segment wholly, deep 

 shining bluish-green ; in the male the larger part of the fourth segment, 

 and the very large hypoi)ygium are shining brownish-red. Legs deep 

 black, the pulvilli light yellow; in the male on the posterior sides of 

 the front and middle femora with thick black pile. Wings hyaline, 

 rather narrowly brownish along the front border. 



Five specimens (Frazar.) 



Pteroptila zouata. 



Pteroptila zonata Loew, Centur., vi, 60. 

 Habitat. — Mexico (Lw.) ! 



S . Length, 13.5""", Black, opaque, si(Jes of the face white polli- 

 nose ; two spots on the anterior margin of the thorax, the transverse 

 suture, the posterior margin of the thorax, and a basal abdominal fas- 

 cia, white tomentose ; fascia of the second abdominal segment livid; on 

 each of the following segments a basal, yellow tomentose fascia; hypopy- 

 gium yellow pollinose ; wings hyaline, stigma and the marginal and 

 submarginal cells blackish. 



