OF WASHINGTON, VOLUME XIV, 1912. 131 



wide; 4 subequal to 3; 5-9 together nearly 1.3 times as long as 3, the last 

 four segments subequal and together about equal to the one preceding; 

 sensory area on ventral surface of segment 5 circular. Maxillary palpi 

 three-segmented; labial palpi four-segmented. 



Prothorax about two-thirds as long as greatest width, distinctly broad- 

 ened behind. Mesothorax a little less than 1.4 times as broad as prothorax, 

 anterior angles broadly rounded; mesoscutum very closely transversely 

 striate. Metathorax with sides roundly converging posteriorly; meta- 

 scutum subreticulate. Wings of fore pair moderately slender (about seven 

 times as long as width at middle), slightly narrower in basal third; venation 

 normal, or with the lower subapical cross-vein wanting; anal half of wing 

 traversed by a longitudinal black band which extends from the basal fifth 

 to the tip of the wing, becoming paler and narrower at apex, and, in the 

 second fifth, broadened to nearly the costal margin; hind wings grayish. 

 Legs short and stout, the fore femora oiily about one and one-half times 

 as long as wide. 



Abdomen stout, of normal structure. 



Measurements of holotype: Length 1.55 mm.; head, length 0.162 mm., 

 width 0.209 mm.; prothorax, length 0.168 mm., width 0.264 nun.; meso- 

 thorax, width 0.360 mm.; abdomen, width 0.432 mm. Antennal segments : 

 1, 36 M; 2, 54 n; 3, 92 M ; 4, 90 M ; 5, 57 M : 6, 14 M ; 7, 14 M ; 8, 14 ; 9, 14 M ; 

 total length of antenna, 0.39 mm., width at segment 4, 0.030 mm. 



Described from one female, taken on Plummer's Island, 

 Maryland (in the Potomac River near Washington, D. C.), 

 May 19, by W. L. McAtee and the writer. It was found in a 

 flower of Hydrophyllum rirginicnin L. 



This species, like the preceding, is related to fcHU'inutii and 

 vittatus. From the former it may be known by the white 

 fourth antennal segment and the stouter facies; from the lat- 

 ter its separation is more difficult, judging from the brief pub- 

 lished descriptions, but should be distinct by the longer seg- 

 ments 5-9, which together are fully a fifth longer than seg- 

 ment 3, instead of subequal to it as in vittatus. The lat- 

 ter is known only from England, Finland, Sweden, and Austria- 

 Hungary (Dalmatia). 



With the specimen above described, I have doubtfully as- 

 sociated another female, taken on a conifer at Urbana, Illinois, 

 May 21, 1908, by J. V. Bopp, then a student in the University 

 of Illinois. It agrees with the type in most respects, but the 

 third antennal segment is slenderer and darkened at tip, the 

 basal transverse band on the wing is complete, and :i second 

 band shows a tendency to appear near the apex of the wing, 

 just basal to the apical seventh. 



