62 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



tion in other respects, especially in the form of the median frontal 

 stripe which I find is more generally broad and complete than 

 narrow and incomplete, as is the rule with typical elata. Loew 

 recognized the similarity to typical data, but the differential 

 characters he gives, except in regard to the arista, seem unmi- 

 portant. This form, however, seems to be our common repre- 

 sentative of the elata assemblage, but I do not consider it a dis- 

 tinct species. The following description may assist in dis- 

 tinguishing this variety. 



Mcsofrontal shining stripes broad, complete; lunule generally visible, 

 especially of the male; second antennal joint rather robust, longer than broad; 

 third joint long and conically pointed; arista densely plumose, especially 

 towards the base; its extreme base is also black, sometimes discoloring that 

 part of the joint. Antennal orbital spot dark, often velvety black. Lateral 

 mesonotal area shining, lighter in color than the opaque, setulose region just 

 above. The infuscatiou of the wings sometimes extended into longitudmal 

 streaks between veins. 



Originally described fi-om specimens of both sexes from the 

 Middle States. 



A female from Tahoe, Lake Tahoe, California, August 30, 

 1910, altitude G300-7000 feet, [A. N. S. P.], has the arista evenly 

 and very densely plumose, with the hairs shorter than usual, 

 the hind cross-vein is more oblique and the antenna! orbital spot 

 very distinct and black. This form may be a distinct variety 

 limited to a more boreal or alpine distribution. 



Specimens Examined. — 44 cf , 65 $. 



Canada: Carbonate, Columbia River, British Columbia, 2600 ft. alt., 

 June 7-12, (J. C. Bradley); Britannia, Ontario, September 8, [all Cornell]. 



Maine: Capens, July 19; Eastport, July 14; Princeton, July 12, (all C. W. 

 Johnson), [all B. S. N. H.]. 



Vermont: St. Albans, June 19, (C. W. Johnson), [B. S. N. H.]. 



New^ Hamp.shiue: Bretton Woods, June 25; Glen House, June 16, (all 

 C. W. Johnson), [all B. S. N. H.]. 



Massachusetts: North Adams, June 18, (C. W. Johnson), [B. S. N. H.]. 



Connecticut: Norwalk, July 9, (I. N. Gabrielson), [Biol. Surv.]. 



New York: Ellis to Slaterville, June 13, (MacGiUivray & Bradley) ; Dry- 

 den Lake, Tompkins County, June 16, (MacGiUivray & Bradley); Ithaca, 

 May-August; McLean, July 2-3; Mud Creek, Tompkins County, June 17- 

 20; Lake Mahopac, June 25, (J. O'Connor); Slaterville to Caroline, June 14, 

 (MacGiUivray & Bradley), [all Cornell]. 



Pennsylvania: Hwarthinore, May 23 to June 22, (Cressou), [A. N. S. P.]. 



Di.sTRicT OP Columbia: Chain Bridge, June 12, (G. M. Greene), [A. N. 

 .S. P.]. 



