ABT. 8 REVISION OF THE FLY GENUS BELVOSIA ALDRICH 15 



Abdomen black, second segment with a narrow and sometimes 

 rather indistinct basal pale crossband interrupted in the middle; 

 third segment with a gray pollinose crossband, interrupted in the 

 middle, its width depending very much on the angle of view, some- 

 times covering all but the apical third of the segment, but in most 

 angles about half; fourth segment densely light yellow pollinose to 

 the extreme apex, the upper surface bare, or with a few scattered 

 hairs; first and second segments with a pair of median marginals, 

 third with a row of 8 or 10, fourth with a row of about 6 smaller. 



Legs black, front pulvilli elongated, equal to the last two tarsal 

 joints; hind tibia with a row of bristles the whole length, one larger 

 at the middle. 



Wings brown, both calypters of the same color. 



Female. — Front at vertex 0.33 to 0.35 of the head width; facial 

 ridges less bristly, third antennal joint about two and one-half times 

 the second. Hind tibia with a row of suberect bristles of increasing 

 size on the basal three-fifths, a few smaller beyond. 



Length, 9.5-11.5 mm. 



Redescribed from 34 specimens of both sexes. Nine were reared 

 by James Zetek at Fort Amador, Canal Zone, from Hylesia sp. (Zetek 

 2445); five from Balboa Heights, Canal Zone (Zetek 2142); one from 

 Ancon, Canal Zone, reared by Zetek from Hylesia darlingi Dyar 

 (Zetek 1212); six from Ancon, Canal Zone (A. H. Jennings), one of 

 them reared from Hylesia sp. ; five specimens from Porto Bella, Panama 

 (A. Busck) ; two specimens, Paraiso, Canal Zone, bred from Hylesia 

 (A. Busck) ; one from Corozai, Canal Zone (Busck) ; one specimen from 

 Misantla, Mexico, reared from Hylesia alinda (Wm. Gugelmann) ; four 

 specimens, Guayaquil, Ecuador (J. B. Rorer). 



Type. — The type of hella is a female labeled "Mexico" in the 

 Zoological Museum of the Royal University at Turin, Italy. I have 

 not seen it. 



Until I saw the Vienna Museum material I had called this species 

 hella Giglio-Tos. In that collection are two series of 20 specimens 

 in all. The first, of 12 specimens from Brazil, determined on the 

 individual specimens as Willistonia by Brauer and Bergenstamm, 

 has a label on 1 specimen, " Gonia recticornis Mcq. Vidi Typ. Br." 

 This connects with Brauer's notes on the Macquart types in the Bigot 

 collection, which he received from Verrall for study; in these notes, 

 cited above, Brauer writes that an undetermined species in the Vienna 

 Museum is the same as the Macquart type. He also says that pfeifferi 

 Schiner MS. is closely related but somewhat smaller. This connects 

 with the second lot of the Vienna material, eight specimens under 

 Schiner's name. These are labeled "Ind. or.?" and "Pfeifferi det 

 B. B." These do not differ, except slightly in size, from the first 

 series. 



