OF WASHINGTON. 83 



two specimens) ; Sandon (G. C. Robbins : nine specimens). Dr. 

 Dyar secured, also, two specimens at Victoria on August 24, and 

 three more at Shawnigan Lake (Vancouver Island) on 

 September i. 



A very abundant species during the latter part of the summer 

 and commonly attracted to the electric lights. All our specimens 

 were taken in houses, either flying around the lights, in the even 

 ing, or, in the daytime, resting on the walls, having flown in the 

 night before. They exhibit great variation in size, the length 

 to tip of folded wings ranging from 21 mm. to 34 mm. 



Genus HEMJiIROBIUS Linnaeus. 



The species of the genus Hemerobius in the collection all be 

 long to the group having three radial sectors. The following 

 key may be of assistance in distinguishing them : 



KEY TO THE SPECIES OF HEMEROBIUS OF THE KOOTENAY 

 DISTRICT, B. C. 



a Posterior fork of median vein bent toward cubitus, thus making the 

 inner veinlet connecting it with cubitus shorter than the outer; 

 radio-median cross vein situated at or before forking of median, and 

 joining radius at or before origin of first sector; in hind wings first 

 fork of radial sector plainly before forking of median. 

 b Radio-median cross vein situated at least as far before forking 

 of median as the former is long, and joining radius much 

 before origin of first sector; forking of median plainly before origin 

 of first sector. 



c Pterostigma reddish mcestus 



cc Pterostigma not reddish. 



d A longitudinal, median, dorsal, pale yellowish stripe on thorax, 



or the latter mostly pale yellowish ; anterior branch of third 



radial sector forked before inner gradate series, and, nor- 



mallv, before subpterostigmal radial cross vein.* 



e Wings plainly marked with fuscous on gradate series, apex 



and hind margin castanece 



ee. Wings but faintly marked with fuscous on gradate series, apex 



and hind margin. 



/Wings rather broad, obtusely pointed at tip; pterostigma 

 small and indistinct; spots along radius and cubitus small; 

 larger species pactjicus 



*I apply this term to the inner of the two veins connecting the radius 

 and its outermost sector and lying more or less in line with the inner 

 gradate series. The anterior branch of third sector is forked at the sub- 

 pterostigmal radial cross vein in left fore wing of H. dyart\ type, 

 but this is undoubtedly abnormal. 



