80 ENTOMOLOGICAL SOCIETY 



Anterior wings rather narrow their width slightly more than one-third 

 their length their tips obtusely pointed, hind margin flattened before 

 tip; costa flattened apically, making this portion of the costal area nar 

 row, the basal half rather narrow; hyaline, with a smoky tinge, the veins 

 pale and marked with minute, indistinct reddish dots ; each wing with two 

 broad, longitudinal fuscous streaks, as follows: (i) An anterior streak, 

 arising near base of first radial sector and extending, along this vein to the 

 hind margin of the wing, widening at inner gradate series so as to include 

 the second sector and at apex of wing covering the area embraced be 

 tween the tips of first and third sectors; (2) a posterior streak, arising 

 obscurely near base of wing and extending along the hind margin out to. 

 or almost to, the tip of anterior fork of median vein, darkest along its an 

 terior border which consists of the apical portions of cubitus and of pos 

 terior fork of median ; posterior fork of median strongly bent toward 

 cubitus, thus making the inner veinlet connecting it with the cubitus 

 much shorter than the outer; radio-median cross vein situated at least as 

 far before the forking of the median as the former is long and joining 

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

 origin of first sector; three radial sectors, anterior branch of the third 

 forked before the inner gradate series and before the subpterostigmal 

 radial cross vein, posterior branch simple; five gradate veins in inner 

 series, the last very slightly before the next to the last, seven in outer 

 series. Posterior wings hyaline with a smoky tinge, the veins as in an 

 terior pair, a very faint trace of the two streaks of anterior wings; the 

 first fork of radial sector plainly before forking of median; Pterostigmata 

 of both wings reddish. 



Little River, Humboldt county, California, 31 May, one speci 

 men. 



Type. No. 7901, U. S. National Museum. 



Allied to //. mcestus and belonging to the same group and 

 section, but readily distinguished from it and from other known 

 species of the genus by the peculiar wing streaks. 



Hemerobius pacificus Banks. 



Bright Angel, Colorado Canyon, Arizona, altitude 2,300 feet, 

 10 May, one specimen. 



Collected also at Williams, Arizona, May 27, 1901, by Messrs. 

 Schwarz and Barber. 



Hemerobius pallescens, n. sp. 



Alar expanse 19.5 mm. Body above and below, including palpi, legs 

 and antennae, pale yellowish. Head with a stripe below each eye and a 

 line on lateral margins of vertex piceous, basal antennal joint rufopiceous 

 externally. Pronotum with a dark stripe each side, leaving a longitudinal 

 median line and the posterior lateral angles pale. Anterior wings rather 

 broad their width two-fifths of their length their tips rather acutely 



