May, '09] ENTOMOLOGICAL NEWS. 221 



segmented, last segment shortest. Antennae 3.4 times as long as exposed 

 portion of head ; nine-segmented. Segments i, 2 and 5-8 barrel-shaped ; 

 third vase-shaped, with two conspicuous constrictions and several other 

 less distinct annul!; fourth cup-shaped; both third and fourth are without 

 distal circle of sensoria ; ninth cylindrical. Segments one, two, and five 

 to nine concolorous with body ; third light yellow, palest at base ; fourth 

 brownish, paler toward base than at tip. Sense cones and spines of only 

 moderate size, not conspicuous. Segments are closely united ; articula- 

 tions are brown, not clear. 



Prothorax twice as long as head ; sides strongly arcuate ; set with 

 numerous short, slightly curved spines, a group of three or four at each 

 angle being more conspicuous than at the middle of the sides ; irregular 

 transverse markings dorsally. Mesothorax slightly wider than meta- 

 thorax ; transversely striated. Metathorax with concentric polygonal 

 markings. Fore-wings reaching nearly to or slightly beyond tip of abdo- 

 men ; brown, paler at base ; costal margin decidedly concave, bearing 

 about 28 stout spines which are longer toward the tip, and among which 

 are numerous slender hairs ; fore vein with about 24, hind vein with 16 or 

 more short spines placed nearly equidistant from each other throughout; 

 surface of wings covered with minute spines. Legs concolorous with 

 body, except tarsi and distal part of fore tibiae which are yellow ; not 

 prominently spinose, but bearing numerous irregular ridges which appear 

 almost like the coarse reticulum on the sides of the thorax and 

 abdomen. 



Abdomen widest about the fourth segment. Each segment from the 

 second to the tenth bears dorsally two distinct spines, which are close 

 together in front, gradually diverge to the ninth segment, but are close 

 together on the tenth ; a number of smaller spines sometimes fall roughly 

 into two rows along the sides, and into one row ventrally. Posterior bor- 

 ders of segments two to eight prolonged into numerous short spines. 

 Tenth segment split in its median dorsal line through its distal third. 

 Spines around tip of abdomen not very prominent. 



Male. General color sometimes much paler than that of the female. 

 Length of body .72 mm. ; width of prothorax .18 mm. ; width of meso- 

 thorax .21 mm. ; width of abdomen .16 mm. Length of antennal seg- 

 ments 10 p., 23 ^ 37 ^, 33 p, 21 /u ,, 2r //,, 15 yu, 12 ^ 14 //,. 



Wings are of fit II length, extending beyond tip of abdomen. 



Tip of abdomen bluntly conical. Ventral sides of abdominal segments 

 three to eight with an oblong pale area transversely placed. 



Described from numerous females and four males taken 

 July 14, 1908, on the outside of the catkins of the willow, 

 Salix fluviatilis. The italicized characters distinguish this 

 species from its congener H. arisaemac Hood. 



