88 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



Museum and carefully examined and compared witli other material 

 by Dr. J. M. Aldrich, upon whose examination this redescription is 

 based. Other material examined is as follows: One male from Los 

 Angeles County, California, August; one male, Socorro, New Mexico, 

 1916 (Williston) ; one female from Hot Springs, Arkansas (H. S. 

 Barber); one female from Wild Horse Canyon, Animas Mountains, 

 New Mexico, 5,000 feet; one female, Yuma, Arizona, June 25, 1917 

 (J. M. Aldrich) ; one female from Fort Grant, Arizona (H. G. Hub- 

 bard); two females from Los Angeles County, California, July; all 

 in the collection of the National Museum. One female in the collec- 

 tion of Prof. J. S. Hine, collected at College Station, Texas. The 

 male in the University of Kansas Museum, labeled "Las Cruces, 

 N. M. 7-7," designated as type. 



There are now known to be several very closely related species 

 resembling decens in the southwestern part of the United States. 

 While the males possess outstanding characters, the females I have 

 examined have proved more difficult and have been somewhat 

 uncertainly placed. Females agreeing with the males of decens in the 

 appearance of the arista, the degree of approximation of the vibrissae, 

 and in having the front narrowest just above the base of the antennae 

 have been assigned to this species. 



EUMACRONYCHIA MONTANA, new species 



Male very closely resembles E. decens from which it differs in the 

 following characters: Front at narrowest, 0.29 of the head width 

 in one specimen measured; trontal vitta densely pollinose over the 

 yellow; frontal row of about seven weak bristles; one feclinate and 

 two proclinate orbital biistles present; facial depression twice the 

 width of paratacial; length oi third joint of antenna three times the 

 second; vibrissae inserted at one-hall the length oi second antennal 

 joint above front edge of oral margin; in profile, bucca subequal to 

 parafacial, equal to one-fifth eye height; parafacial bare. Prongs 

 of inner forceps of genitalia divergent, but not bowed when viewed 

 from the rear; outer forceps tapering to points more slender than 

 those ol inner pair, broadly curved towards tips of latter. Wings 

 without costal spine. Pulvilli as long as last tarsal joint; tibia 

 without long villous hairs. Female not laiown. 



Type.—MslQ. Cat. No. 28160, U.S.N.M. Mesilla Park. New 

 Mexico. 



Described from one male from Mesilla Park, New Mexico (C. N. 

 Ainslie), in the collection of the National Museum; and one male 

 from Mount Superstition, near Iligley, Arizona, July 26, 1917, on 

 Agave palmeri (E. G. Holt), loaned by el. K. Malloch. 



