1914 Canadian Entomologist  
Experiment Station, six; collection of Dr. J. M. Aldrich, two; collection of writer, eight. This species is rendered especially easy to separate from other Xorth America members of the genus by the lack of marginal bristles on the third abdominal segment. S. kellyi, a much smaller species recently described by Prof. is the only other native species with which the writer is acquainted that also lacks these bristles. The two species are a t once differentiated by the presence of presutural
more » ... f presutural acrostichal biistles and three rows of black cilia behind the eyes in S. kellyi Ald., while S. cooleyi lacks these bristles and has but two rows of cilia. Of the males S. kellyi has a grayish pollinose first genital segment, tinged with thc reflecting colours of the abdomen, but the corresponding seginent of S. conleyi is dull orange, a t inost slightly grayish pollinose anteriorly. The feiuale of keblyi has three sternopleurals, that of cndeyi four. Length: 7 to 13 nlm.; average 10 to 12 mtn. Male Head :-Viewed from side parafrontals and g e m with dark reflections. Breadth of front a t narrowest part about threefifths eye ~v i d t h ; chce!; 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 back\\-art1 by slight curves. Second antenna1 segment dark, its tip sometimes slightly brownish; third segment two and one-half times length of s x o n d ; arista plutllnse on basal oiie-half to twothirds. Rack of head som-whlt convex, with two rows of black cilia behind eyes, otherwis2 clothed with whitish, silvery white, or sornetimes faintly yellowish hair. Cheeks clothed with black -*;-1,o~trihution from the Entomolo~ical 1.aboratory of t h e 3'Iassacheusetts ~\~r i ? u l t~~r a ! Col1e;e. Drccmber, 1914
doi:10.4039/ent46417-12 fatcat:uqziorzmlnd6jempmnkjlyuvxm