PSYCHE. 



DIPTERA OF THE ORGAN MOUNTAINS IN SOUTHERN NEW 

 MEXICO. — II. 



BY C. H. TYLER TOWNSEND, LAS CRUCES, NEW ME.XICO. 



In the latter part of August, 1897, a 

 few days were spent collecting in Fil- 

 more Caiion, and on the main ridge of 

 the Organs above its head. The more 

 notable results of this collecting are 

 here given. Filmore Caiion runs down 

 the west slope of the range, and is 

 about five miles long, its head being 

 about 8,000 feet and its mouth about 

 5,000 feet altitude above sea. During 

 the moister season of the year a stream 

 of clear cold water courses down the 

 caiion, flowing over sandy beds and 

 amongst boulders, often dropping from 

 a few to ten or fifteen feet over masses 

 of rock, finally dashing down a wall 

 about fifty feet in height some distance 

 within the mouth of the caiion. At the 

 time of the above visit the bed of the 

 stream was for the most part dry in 

 the upper three or four miles of its 

 course, the water seeping out at inter- 

 vals but soon disappearing again. 



5. Tersesthes iorrens Towns. Thir- 

 teen females taken on horses, at camp 

 in Filmore Caiion, about 6,000 ft., 

 August 29, 1897. They were particu- 



larly bad about the horses' heads, 

 especially about the eyes. 



This species was discovered by me 

 June 21, 1892, on the Continental 

 Divide, 7,000 ft., six miles west of 

 Patterson, in Socorro county, N. M. 

 The genus and species were described 

 in Psyche, January, 1893 (vol. 6, pp. 

 369-371, with pi. 8). The present 

 specimens found in Filmore Caiion, 

 Organ Mts., are the first and only ones 

 that have come to notice since the dis- 

 covery of the original specimens. The 

 genus and species are easily recogniza- 

 ble by the descriptions and plate in 

 Psyche. 



6. Volucella victoria V\'ill. Three 

 males, top of ridge above head of Fil- 

 more Caiion, about 8,500 ft., August 28, 

 two being taken on flowers of a grass, 

 Bouteloua sp., prob. hirsuta Lag. (det. 

 Tinsley), and the other on flowers of 

 Chrysopsis villosa Nutt. var. (det. Tins- 

 ley). 



7. Copestylum tnarginatum Say, var. 

 One male, top of ridge above head of 

 Filmore Caiion, about 8,500 ft., Au- 



