THE CANADIAN ENTOMOLOGIST. 1G3 



ATidrena Cockerelli, n. sp. $ . — Length lo-i i mm.; black, with 

 long, thin, whitish pubescence; a few black hairs on front below ocelli; 

 facial fovefe broad, black, reaching a little below the insertion of the 

 antennai ; antennas dark, joint 3 longer than 4 and 5 together ; clypeus 

 convex, somewhat shining, distinctly roughened and closely punctured ; a 

 median narrow and slightly elevated impunctate line ; process of labrum 

 triangular, notched at tip ; mandibles black, slightly ferruginous near the 

 tips ; cheeks broad and evenly rounded, finely roughened, clothed with 

 long, white pubescence ; mesonotum dull, tessellate, with sparse, hardly 

 visible, punctures ; the disc of the mesonotum is somewhat shining, as 

 also the scutellum ; enclosure of metathorax small, bordered by an 

 impresced line and somewhat rugose at base ; wings hyaline, nervures 

 and stigma testaceous ; the second submarginal cell is about two-thirds as 

 long as the third and receives the first recurrent nervure far beyond the 

 middle of the cell ; abdomen shining, minutely granular, without 

 punctures ; the thin white pubescence of the abdomen is most con- 

 spicuous on the first segment ; legs dark brown, with white pubescence ; 

 the basal joints of the tarsi are clothed with fuscous hairs on their inner 

 surface ; anal fimbria dark purplish brown. 



$. — Length 9 mm.; the pubescence is of a purer white than in the 

 female ; in addition to the black hairs below the ocelli, there is a narrow 

 row of black pubescence immediately behind and in front of the eye ; 

 there is also a patch of black hairs on the sides of the metathorax ; head 

 large, broader than the thorax ; antennae long, slender, joint 3 hardly as 

 long as 4 -I- 5 ; the surface of the clypeus is concealed by long and dense 

 pubescence ; mandibles long and slender ; cheeks broad, produced into a 

 rounded angle, which is situated above the middle of the eye, 



Milwaukee, Wis.; numerous $ and 5 specimens from April 6 to 30, 

 on flowers of willows, especially of Salix discolor. Kent Co., Mich.; i ^ , 

 April 1, 1902 (collected by A. D. Macgillivray, received from Prof. T. D. 

 A. Cockerell). Hartford, Conn.; i ? , April 19, 1896 (collected by S. N. 

 Dunning, No. loii, received from Prof T. D. A. Cockerell). 



The females are all about the same length. The males vary 

 considerably in size, ranging from 6 to 9 mm. in length. This species 

 resembles A. macoupmensis., Rob., but differs from it mainly in the 

 following characters : Facial fove?e distinctly black (pale in macoupi?ien- 

 sis); legs dark brown (hind tibiae and tarsi ferruginous in macoupinemis); 



