May, 1893.] INSECTS OF THE DEATH VALLEY EXPEDITION. 259 



2. Fourth and fifth veins of the wings incomplete beyond the discal cell, not reach- 



ing the border LlMOSINA 



Fourth vein, at least, fully developed and reaching tlie border 3 



3. Scutelhun with well-developed bristles; the fifth vein incomplete beyond the 



discal cell BORBOR'US 



Scutelluin without bristles; fifth vein complete SPBLEBOCEKA 



Boi horns, sp.: 



Two specimens, Argus Mountains, which seem to belong to a new species. 

 Lirnosiiia aldrichi n. sp. 



Male. — Black, but little shining, nearly hare. Face somewhat whitish. Front, 

 hut little shining in the middle. An tenure black, arista long, distinctly pubescent. 

 Thorax shining. Scutellum flattened, bare, with six bristles, the pair near the 

 apex much larger than the ones toward the base. Abdomen opaque, somewhat prui- 

 nose. Legs black, the tibiae and tarsi more or less dark luteous ; kind metatarsi only 

 a little dilated, and but little shorter than the following joint. Wings nearly hya- 

 line; the third vein ends beyond the small cross-vein, gradually and nearly uni- 

 formly curved forwards; the tip of the second is nearly midway between the 

 terminations of the first and third veins, the latter ending near the tip of the wing; 

 fourth vein beyond the discal cell faintly indicated. Hind cross-vein rectangular 

 to the fourth vein. Length, 3 mm . 



One specimen, Argus Mountains, April, 1891. 

 Apterina polita sp. nov. 



Female. — Very small, shining black, without wings and apparently without hal- 

 teres. Scutellum large, flattened, trapezoidal, with four well-developed bristles. Face 

 excavated in profile ; oral margin on either side with a conspicuous bristle. Cheeks 

 moderately broad. Clypeus retracted into the oral cavity. Antennae short, third joint 

 rounded, hairy, with a long, pubescent arista. Eyes bare. Front broad, with a row of 

 orbital, proclinate bristles. Thorax with bristles. Abdomen broadly oval, depressed, 

 with sixvisible segments, the second, third, and fourth of nearly equal length. Legs 

 slender, with bristles, the middle tibiae, at least, with a preapical bristle; first joint 

 of the hind metatarsi short, and dilated. Front opaque, with a shining median stripe 

 or elongated triangle ; face and cheeks whitish dusted. Dorsum of thorax, scutellum 

 and abdomen shining, the hair very short and sparse. Tip of femora, base of tibiae, 

 and the tarsi, save the tip, yellowish. Length LV ,nm . 



Three specimens, Panamint Valley, April, 1891. 



Apterina is subordinated to Borborus by Schiner, and he may be right in doing so. 

 The present species is in all respects a wingless Limosina, but that genus has no tan- 

 gible differences from Borborus save such as are found in the neuration. A mere 

 excresence, of a yellowish color, is all there is to be seen of the wings. I therefore 

 locate the species, provisionally, at least, in Macquart's genus. 



Note. — In addition to the Diptera reported upon above by Dr. Williston, the col- 

 lection contains 7 species easily named which were not sent to him, nor was it tlumght 

 worth while to introduce these few names into the tabulated list which precedes. 

 They are added here, however, for the purpose of completing the report. — C. V. R. 



Tabanus punctifer O. S : 4 ex. , Panamint Valley and Death Valley. 



Pantarbes capito 0. S 1 ex., Argus Mountains. 



Triodites mus O. S 1 ex., Coso Valley. 



Lorcloius diversus Coq 5 ex., Panamint Valley and Death Valley. 



Ploas fenestrata O. S 3 ex., Death Valley. 



PlatijcMrws peltatus Meig 1 ex., Argus Mountains. 



Bibiohirtus Loew - 1 ex., Santa Cruz Mountains. 



