1903] JOHNSOA ■ .• — PHTHIKIA I 8 5 



processes, and scutellum yellow. Abdomen yellowish, tlie dark basal portions being brown, 

 and entirely wanting on the last four segments. Legs yellow, with only the tips of the tibiae 

 and metatarsi and all the tarsi brown or blackish. Length, 4 mm. 



Described from three males and one female received from Prof. J. M. Aldrich, 

 who says : — "I collected it on a white sand bar along the Boise river at Caldwell, 

 Idaho, June 24, igoi. It is very pale in life, and flies just like the drifting of the 

 sand, close down and a short distance at a time. It is a fine instance of protective 

 coloration. The male has beautiful purple eyes in life." 



PhTHIRIA QUINQUENOTATA, sp. nOV. 



$ Front, face, and occiput grayish white, with short white pile ; antennae and proboscis 

 black. Thorax grayish white, sparsely covered with white hairs; dorsum with five large, 

 velvety black spots arranged as follows: — one on each side just above the humeri, and three 

 just back of the transverse suture; two slender black dorsal lines extend anteriorly from the 

 central spot, and there is also a very small dot above the base of the wing ; scutellum grayish 

 white and quite thickly covered with white hairs, base narrowly margined with black ; meta- 

 notum black, abdomen covered with a whitish pubescence through which the black ground 

 color is visible ; yellow posterior margin of the first segment broad, on the others very 

 narrow. Legs black, tips of the femora and base of the tibiae and middle metatarsi yellow ; 

 on the middle and hind tibiae there is an obsolete brownish band near the base, with a 

 broader yellowish band above. Wings whitish hyaline, veins. yellow. Length, 4 mm. 



One specimen from Grand Junction, Colorado, received from Prof. C. P. 



Gillette. 



