THE CANADIAN ENTOMOLOGIST 417 



A NEW SARCOPHAGID SCAVENGER FROM MONTANA.* 



BY RALPH R. PARKER. M.S., AMHERST, MASS. 



Sarcophaga cooleyi, n. sp. 



Plate XXVI; figures 1, 2, 3 and 4. 



Type, c? and 9 : Massachusetts Agricultural College. 



Paratypes, o 71 and 9 : Massachusetts Agricultural College, 

 four; United States National Museum, four; Montana Agricultural 

 Experiment Station, six; collection of Dr. J. M. Aldrich, two; 

 collection of writer, eight. 



This species is rendered especially easy to separate from other 

 North America members of the genus by the lack of marginal 

 bristles on the third abdominal segment. 5. kellyi, a much 

 smaller species recently described by Prof. J. M. Aldrich (Journal 

 of Agricultural Research, vol. 2, No. 6, Sept. 1914, pp. 443-445) 

 is the only other native species with which the writer is acquainted 

 that also lacks these bristles. The two species are at once dif- 

 ferentiated by the presence of presutural acrostichal biistles and 

 three rows of black cilia behind the eyes in 5. kellyi Aid., while 

 S. cooleyi lacks these bristles and has but two rows of cilia. Of 

 the males 6". kellyi has a grayish pollinose first genital segment, 

 tinged with the reflecting colours of the abdomen, but the corres- 

 ponding segment of 5. cooleyi is- dull orange, at most slightly 

 grayish pollinose anteriorly. The female of kellyi has three 

 sternopleurals, that of cooleyi four. 



Length: 7 to 13 mm.; average 10 to 12 mm. 



Male Head: — Viewed from side parafrontals and genae with 

 dark reflections. Breadth of front at narrowest part about three- 

 fifths eye width; cheek height approximately one-half that of eyes. 

 Front prominent, upper inner orbits of eyes converging downward ; 

 sides of frontal vitta not drawn in at base and usually converging 

 backward by slight curves. Second antennal segment dark, its tip 

 sometimes slightly brownish; third segment two and one-half 

 times length of second; arista plumose on basal one-half to two- 

 thirds. Back of head somewhat convex, with two rows of black 

 cilia behind eyes, otherwise clothed with whitish, silvery white, or 

 sometimes faintly yellowish h air. Cheeks clothed with black 



*Contribution from the Entomological Laboratory of the Massacheusetts 

 Agricultural College. 

 December. 1014 



