Oct., 1915 Bulletin of the Brooklyn Entomological Society 11 



shorter, the two pairs near the posterior angles longer and stouter ; coxal 

 bristle about equal to anterior marginals. Pterothorax much wider than 

 prothorax, sides slightly arcuate. Wings long, closely fringed, of nearly 

 the same width throughout ; fore pair with a brown median streak in basal 

 half and with about 14 accessory hairs ; hind wings nearly clear. Fore 

 tarsi unarmed. 



Abdomen of normal form, rather large and heavy, and wider than ptero- 

 thorax. Tube three fourths as long as head and about 2.3 times as long 

 as basal width, which is slightly more than twice the apical. Lateral 

 abdominal bristles scarcely pointed and blackish brown in color; terminal 

 bristles pointed, grayish, usuallj^ subequal in length to tube. 



Measurements of holotype : Length 1.74 mm.; head, length 0.257 rnm., 

 width 0.214 mm.; prothorax, length 0.133 mm., width (inclusive of coxae) 

 0.346 mm.; pterothorax, width 0.420 mm.; abdomen, width 0.516 mm.; tube, 

 length 0.193 mm., width at base 0.085 rnm., at apex 0.039 mm. 



Antenna! segments 12345678 



Length (m) 51 60 80 72, 67 64 59 34 



Width (m) 38 2,i 2,i y? 36 ZZ ■2^ 15 



Total length of antenna, 0.488 mm. 



Male (macroptcrous) . — Length about 1.6 mm. Slightly smaller and more 

 slender than female. Upper lateral pair of bristles at apex of segment 9 

 of abdomen much shorter than basal width of tube, the lower lateral and 

 dorsal pairs of normal length. 



Measurements of allotype: Length 1.608 mm.; head, length 0.246 mm., 

 width 0.192 mm.; prothorax, length 0.116 mm., width (inclusive of coxae) 

 0.298 mm. ; pterothorax, width 0.348 mm. ; abdomen, width 0.384 mm. ; tube, 

 length 0.190 mm., width at base 0.078 mm., at apex 0.032 mm. 



Antennal segments 12345678 



Length (m) 44 54 75 72 69 66 57 32 



Width (fi) 33 30 29 33 30 27 24 13 



Total length of antenna, 0.469 mm. 



Described from 19 females and 2 males, all taken on chestnut leaves, as 

 follows : 

 Virginia: Bluemont (type locality), July i, 1914 (5 females), and August 



31, 1913 (3 females) [J. D. Hood] ; Great Falls, May 19, 1915 (3 



females, i male) [W. L. McAtee]. 

 Maryland: Odenton, July 12, 1914 (6 females, i male) [J. D. Hood]. 

 Connecticut: East Hampton, May 31, 1915 (2 females) ["99iid, Hopk. 



U. S."]. 



Closely allied to uuihripennis and ocellatus, but easily separated 

 from both by the color of the fore wings. Umbripennis, further- 

 more, has a much shorter tube, while ocellatus has the lateral 

 abdominal bristles yellow and the prothorax distinctly more than 

 half as lonsf as the head. 



