40 INSECUTOR INSCITI^ MENSTRUUS 



Antennal segments 1 2 3 4 5 6 7 8 



Length (n) 51 69 93 91 82 68 59 42 



Width in) 48 39 44 43 38 32 30 15 



Total length of antenna, 0.555 mm. 

 Male (macroptcrous). — Length about 1.8 mm. Color and 

 structure almost as in female. Postocular bristles nearly as 

 long as eyes. Pronotal recticulation indistinct; anterior mar- 

 ginal bristles almost obsolete, pointed ; anterior angulars long- 

 est, expanded at apex, about equal in length to eyes ; remain- 

 ing bristles distinctly shorter than anterior angulars, sub- 

 equal in length, expanded apically; coxal bristle still shorter. 

 Fore wing with 10 or 11 accessory hairs. Fore tarsus with a 

 strong, slightly curved tooth. Abdomen very slightly nar- 

 rower than pterothorax. Tube a little more than half as 

 long as head, about 2.2 times as long as greatest subbasal width, 

 which is about 1.9 times the apical ; sides very slightly sinuately 

 converging to apex. Lateral abdominal bristles spatulate at 

 apex; lower laterals of segment 9 long and pointed as in 

 female ; upper laterals very short (two-thirds as long as basal 

 width of tube), stout, pointed, and dark in color; dorsals 

 dilated at apex. 



Measurements of allotype : Length 1.82 mm. ; head, length 

 0.308 mm., width 0.226 mm.; prothorax, length 0.168 mm., 

 width (inclusive of coxae) 0.379 mm. ; pterothorax, width 

 0.408 mm.; abdomen, width 0.403 mm.; tube, length 0.163 

 mm., width near base 0.075 mm., at apex 0.039 mm. 



Antennal segments 12345678 



Length {\i) 47 63 88 82 75 65 57 39 



Width (n) 43 36 40 40 35 30 27 14 



Total length of antenna, 0.516 mm. 

 Described from one female and one male taken from leaves 

 on a felled elder at Oyster Bay, Washington, December 9, 

 1914, by W. L. McAtee, whose name it bears in commemora- 

 tion of his zeal in entomology. 



The dark color of the antennse and the large spiniferous 

 tubercles on the cheeks readily distinguish this form from its 

 North American congeners. 



