XOKTH AMERICAN DIPTEKA. 303 



Male and female specimens from San Domingo, Arizona and Cali- 

 fornia I refer to this species, differing from bifasciata in the antennae 

 being shorter, with the third joint not more than twice the length of 

 the second, the posterior margin of the third segment more broadly 

 black, and the last section of the fourth vein more concave. Mac- 

 quart (1. c.) united the species, prematurely I think, as the difference 

 in the antennas is not sexual, as he supposed. I have males and 

 females of each, agreeing in the antennal character, or at least not 

 appreciablv diffei'ent. The difference in length is considerable, and 

 I can hardly think it an individual variation ; in any event numerous 

 specimens are needed to make it clear that such is the case. The 

 size of the pulvilli and ungues will distinguish the sexes. 



Belvoisia v. cl. Wiilpi n. sp. 



Female. — Black, face silvery on the sides; dorsum of thorax before the suture 

 opaque, shining behind, the last two segments of the abdomen deep opaque 

 orange-red, antennae and legs black, wings bvown. Length 14 mm. 



In size and structure like B. bifasciata. Sides of the face silvery white, in the 

 middle between the ridges opaque black. Front opaque black, the middle stripe 

 ashy ; on each side with two rows of bristles. Antennae wholly black, the third 

 joint about twice the length of the second. Palpi black, the tip cinereous. Dor- 

 sura of thorax to the suture, or a little beyond, deep opaque black, behind bright 

 shining. Scutellum subopaque. First two segments of the abdomen deep black, 

 moderately shining, the third and fourth wholly deep opaque orange or brick red. 

 Tegulfe dark brown. Legs black ; front femora behind with a row of rather 

 slender bristles, the middle and hind tibise with stout spinous bristles without. 



The front is narrower above than in B. bifasciata, the bristles of 

 the front are stronger ; there are but two on the hind margin of the 

 first and second abdominal segments ; the claws are small, as usual 

 in the females. The wings are lighter colored in the anal angle and 

 posterior border. 



One specimen, 8an Domingo. 



Saun<lersia flavitarsis Macquart, Dipt. Exot. ii, 3, 47. 3, pi. v, fig. 1, 

 ler. Suppl. 152, 11, pi. 13, fig. 7, 3e. Suppl. 45 { Micropalpus) ; Schiner, Novara 

 Exped. 334. 



, Hab.— Mexico, South America. 



An injured male specimen, without locality, but probably from 

 New Mexico, is evidently of this species. 



SauiKlersia signifera. 



? Tachina signifera Walker, List, etc., iv, 708. 



% 9 • — Abdomen black, fourth segment with a light golden gray opaque band. 

 Length 12-13 mm. 



Head yellowish white, sides of the front black, but concealed beneath light 

 yellowish pollen ; frontal stripe opaque red or ochraceous. Antennae red, third 



