INSECUTOR INSCITI^ MENSTRUUS 137 



brownish margin and pale yellow cilia ; halteres reddish black. 

 Length 9 mm. ; wing 9 mm. 



Type.— Cat. No. 25377, U. S. Nat. Mus. 



Described from two females ; Las Vegas, New Mexico, June, 

 1901, 11,000 feet altitude (T. D. A. Cockerell). 



Among the species of CJiilomyia, catalina is closest related 

 to sonoriana but has a much less prominent face. 



Chilosia catalina, new species. 



Female. — Medium size, rather robust species, entirely shining 

 steel blue color ; eyes hairy ; face bare ; scutellum with bristles ; 

 apical cross-vein forming an acute angle with the third vein ; 

 arista a little longer than width of frons measured at base of 

 antennae ; ocelli set well before the posterior corners of the 

 eyes ; frons with rather sparse and fairly stiff black pile ; frons 

 and face fairly broad, their lateral margins widening evenly to 

 lower corner of eyes ; antennae bright reddish yellow ; third 

 joint about five times as large as the second ; arista reddish 

 yellow at base, darkening outwardly, pubescent. Mesonotum 

 with short luteous pile and short stiff black hairs intermixed, 

 and bristles near the wing bases ; pleurae with whitish pile and 

 no bristles. Femora black, yellowish at apex ; tibiae brownish, 

 becoming lighter at their apices and bases ; tarsi brownish. 

 Abdomen with only whitish pile. Wings reddish yellow at base 

 and lutescent throughout ; squamae pale reddish yellow ; hal- 

 teres reddish yellow. Length 9.5 mm. ; wing 8.25 mm. 



Type. — 9 , Cornell University collection. 



Collected at Webber's Cabin, Mount Lemon, Santa Catalina 

 Mountains, Arizona, July 27, 1917, by J. C. Bradley of the 

 Cornell Biological Expedition. Other specimens in the Cornell 

 collection and one in the Biological Survey collection. 



Chilosia alaskensis Hunter is its nearest ally of the bare 

 faced Chilosiae. It differs from C. catalina by having the ocelli 

 placed in line with the posterior margins of the eyes ; a notice- 

 ably broader frons and face, the arista is shorter than the 

 width of the frons ; the upper edge of the third antennal joint 

 is blackish ; the arista brownish throughout ; pile on the meso- 



