216 PROCEEDINGS OF THE NATIONAL MUSEUM vol S+ 



RemarTfs. — Described from a series of 40 specimens: Holotype 

 male and 36 paratype male and female specimens, Coeiir d'Alene, 

 Idaho, June 18, 1929 (H. J. Rust) ; 1 paratype female, Metaline, 

 Wash,, July 7, 1934 (W. D. Redard) ; 2 paratype females, Sula, 

 Mont., June 25, 1929 (D. DeLeon). 



This sj)ecies differs from Phaonia protuherans Malloch in that 

 the antennal axis and the vibrissal axis are subequal, the buccal 

 length being produced in protuherans. It differs from P. serva 

 Fallen in that the bases of the wings are not yellow or orange and 

 from P. savonoskii Malloch in that the midtibia of both sexes 

 lacks a median anterior dorsal bristle. 



Pupae of these flies were found under the bark of lodgepole pine 

 and western white pine, most abundantly in wet windfalls, accord- 

 ing to James C. Evenden, entomologist. Forest Insect Laboratory, 

 Bureau of Entomology and Plant Quarantine, Coeur d'Alene, Idaho. 

 He states that they are always associated with the mountain-pine 

 beetle in white pine and that they have not been found in wet wind- 

 falls that have not been attacked by this insect. D. DeLeon found 

 pupae of this fly in egg galleries of D. nionticolae at Sula, Mont., 

 in nearly every instance. 



The larvae are successfully reared upon larvae of D. monticolae^ 

 and during studies upon the insect at Sullivan Lake, Metaline Falls, 

 Wash., in June 1932, larvae were found in the act of devouring D. 

 monticolae larvae, and other larvae were found with their heads 

 covered with beetle larval head capsules. 



U. S. GOVERNMENT PRINTING 0FF1CE:I937 



