OF WASHINGTON, VOLUME XIV, 1912. 139 



as long as head, prominent, protruding, noticeably pilose. Ocelli normal, 

 opposite about middle of eyes. Antennae long, more than twice the length 

 of head, unusually slender, form and structure well shown in figure (PI. V, 

 fig. 6); segments 1 and 2 concolorous with head, the latter segment, how- 

 ever, with dense crimson pigment; remainder of antenna yellow, with base 

 of third and, to a less degree, of fourth to sixth and all of seventh, usually 

 shaded with gray. Maxillary palpi three-segmented. 



Prothorax about 1.5 times as wide as long, without evident sculpture, 

 sides gently rounded; two pairs of long, slender bristles at posterior angles. 

 Wings of fore pair about fourteen times as long as wide, white in basal 

 fourth, remainder blackish brown; costal margin with about 25 spines; 

 anterior vein with 10 spines, of which seven are nearly confined to the 

 white band (not passing basal 4/11 of wing), the remaining three at 7/11, 

 9/11, and a little more than 10/11 beyond base of wing, respectively; 

 posterior vein also with about 10 spines, the first of which is usually ex- 

 actly behind the last spine in the basal series of the anterior vein, and the 

 last of which is opposite a point nearly midway between the last two on 

 the anterior vein. Legs concolorous with body, rather conspicuously set 

 with stout, dark bristles. 



Abdomen of normal form, with tenth segment longitudinally sulcatc 

 above in at least apical half; bristles on segments 9 and 10 long, stout, 

 nearly black. 



Measurements of holotype: Length 1.24 mm.; head, length 0.144 mm., 

 width 0.163 mm.; prothorax, length 0.132 mm., width 0.193 mm.; mesotho- 

 rax, width 0.276 mm.; metathorax, width 0.246 mm.; abdomen, width 0.282 

 mm. Antennal segments: 1, 30 ^; 2, 42 n; 3, 64 ^; 4, 54 /j; 5, 48 n; 6, 58 /u; 

 7, 22 n; total length of antenna, 0.32 mm., width at segment 4, 0.019 mm. 



Male. Length about 1 mm. Similar in color and general structure to 

 female. Segment 9 above with a pair of short, slender bristles at apical 

 third near lateral margin, and with four larger bristles apical, equidis- 

 tant, and subparallel lying closely above suranal plate; the latter with 

 four slender bristles at apical third, the median pair longer; lateral, sub- 

 apical bristles of segments 9 and 10 long, dark, moderately conspicuous. 



Measurements of allotype: Length 0.98 rnm.; head, length 0.127 mm., 

 width 0.144 mm.; prothorax, length 0.102 mm., width 0.167 mm.; meso- 

 thorax, width 0.223 mm.; metathorax, width 0.192 mm.; abdomen, width 

 0.164 mm. Antennal segments: 1, 29 /u; 2, 38 M ; 3, 60 ^; 4, 51 M; 5, 41 A/; 

 6, 58 ft; 7, 20 n; total length of antenna, 0.30 mm., width at segment 4, 

 0.018 mm. 



Described from 17 females and 4 males, all from Illinois, 

 as follows: Carbondale, September 19, 1908, L. M. Smith, 

 1 male; Clay City, September 2, 1909, C. A. Hart, 2 females; 

 Dubois, April 28 and September 17, 1908, July 3, 1909, C. 

 A. H., L. M. S., 12 females, 3 males; Herrin, May 12, 1909, 

 L. M. S., 1 female; Olney, May 4, 1909, L. M. S., 1 female; 



