512 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



longitudinal straight line ; vertex bluntly triangular, its apex white, and 

 bounded inferiorly by a brown, minute, arcuated line; the edge white, 

 bluntly rounded; cranium with a broad and long brown line each side, 

 which tapers anteriorly, invaded in front by a slender band and by a 

 broader oblique line each side posteriorly, both white ; the broad lateral 

 and the central depressed line also white ; clypeus white, the rostrum 

 dull ochreous, tipped with piceous. Pronotum white, with six brown 

 lines, of which the two middle ones are broader and longer, and between 

 them are two very dark brown points; beneath the posterior angle of 

 the eye is a spot, and on the side of the pronotum, as well as on its 

 lower margin, is a brown line ; cheeks with a large brown spot and 

 minute specks in the darker specimens. Pleura blackish, the segments 

 margined with testaceous or yellow. Scutellum faintly embrowned { 5 ), 

 suffused with yellow (^), and marked with a brown spot each side of 

 base, with a smaller spot each side of the middle, and with a submargi- 

 nal line each side of tip. Corium translucent, pale testaceous, margined 

 all around with white, the nervures white, and the areoles of the disk 

 and tip margieed with fuscous; four apical areoles, which are large and 

 angular. Wings milky- white, a little nebulous exteriorly towards the 

 tip. Legs yellowish, the femora banded and the posterior pair streaked 

 with brown ; the tibise with longitudinal series of brown dots; apical 

 two- thirds of the tarsi piceous. Abdomen black, the fore and hind 

 margins of the segm'ents, and usually two or three of the posterior seg- 

 ments testaceous ; connexivum margined more" or less greenish-yellow. 

 Last ventral segment of the female triangularly lobed on the middle of 

 the hind margin, and emarginated each side of the lobe. Inferior gen- 

 ital covers long, suboval posteriorly, the margin situated inferiorly and 

 with a short groove ; at the upper angle is a pencil of stiff bristles ; the 

 sheath supporting the penis is shovel-shaped, beset with bristles, a little 

 sinuated each side, where also a long stylet projects backwards. Length 

 to tip of abdomen ( $ ) 4""°, ( ? ) 5™™. Width of pronotum 1.5""". 



The female is paler than the male, and has less fuscous on the hem- 

 elytra. In both sexes, the hemelytra are shorter than the abdomen. 



Collected in the Milk Eiver region in Northern Montana. 



A species of Psylla is in the collection from the vicinity of Pembina, 

 b'at it is too much altered to admit of description. 



