NEW ACALYPTRATE FLIES — WHEELER 



309 



tapering to its apex. There are no visible cerci protruding. The 

 front metatarsus of the female lacks the thumblike extension of the 

 male, and the upper facial hairs tend to be more numerous (usually 

 8-10 in number) though many of them are pale and hard to see. The 

 body length is up to 4.0 mm. in a specimen with the abdomen extended. 

 Types: Holotype male, USNM 62897, Rustler Park Campground, 

 Chiricahua Mountains, Coronado National Forest, Ariz., June 11, 

 1951. Paratypes as follows: 2 males, 1 female, from the type locality; 



Figure \ —Latheticomyia tricolor: a, liolotype male, lateral view; b, male genital segments, 

 external features; c, same, internal structures drawn from cleared specimen. 



2 males, Mingus Mountain Recreation Area, Prescott National 

 Forest, Ariz., June 20, 1951; 1 female, Ramsey Canyon, Huachuca 

 Mountains, Ariz., June 15, 1951; 1 female. Horse Thief Basin Recrea- 

 tion Area, Prescott National Forest, Ariz., June 18, 1951 ; 1 female, 

 Clover Springs, near Long Valley, Coconino National Forest, Ariz., 

 June 22, 1951; 1 male, near Long Valley Junction, Dixie National 

 Forest, Utah, Aug. 18, 1953 (W. B. Heed, coUector). Two paratypes 



