258 



Annals Entomological Society of America [Vol. I, 



Total 

 length 



Monell's Types, Washington, 

 D.C.. Junes, 1880 



Hayhurst's Specimens, Arling- 

 ton. Va.. June 28, 1907 



Davis's Specimens, Urbana, 

 111., Aug. 25 and Sept. 4, 

 1907 



1.438 

 1.461 



1.665 



Wingless oviparous female. — General color yellow orange, when fully 

 mature. When they first become adult the body is usually entirely yellow, but 

 as the eggs, which are of an orange color, begin to develop within the body 

 they show through the semi-transparent skin and give the orange tint to the 

 body. Head pale yellow. Antennae, at base, concolorous with head, and 

 darkening towards the apex; not reaching to base of cornicles, and with about 

 8 or 10 circular sensoria in a row on segment III. (PI. XXIII, fig. 32.) Eyes black. 

 Prothorax pale yellow, meso- and metathorax varying from yellow to orange, 

 according to age since maturity. Legs pale yellowish except tarsi; proximal 

 half of hind tibiae swollen and with 25 to 40 inconspicuous circular sensoria. 

 (PI. XXIII, fig. 33.) Dorsumof abdomen with longitudinal rows of darkened tuber- 

 cular spots, three on each side of the median, the spots of the two rows, along the 

 median are oval and usually bear two seta?, arising from conspicuous tubercles, 

 while the spots of the remaining four rows are circular and but one setffi arises 

 from each. Cornicles concolorous and tubercular. 



]\Ieasurements. — (From specimens in alcohol and balsam, taken on Tri- 

 folium pratense at Urlaana, 111., November 1.5 and 26, 1907.) Length of bodv, 

 1.636-2.072, average, 1.848 mm.; width, 0.737-0.992, average, 0.864 mm'.; 

 antenna, I, 0.070; II, 0.060; III, 0.358-0.473, average, 0.407; IV, 0.179-0.236, 

 average, 0.199; V, 0.179-0.228, average, 0.207; VI, basal, 0.122-0.146, average, 

 0.133; VI, filament, 0.138-0.147, average, 0.142; total (average), 1.218 mm.; 

 cornicles, 0.061 mm.; hind tarstis, 0.134 mm. 



Egg. — The egg is elliptical, of a bright orange color when first laid, and 

 ineasures 0.578 mm. in length by 0.252 mm. in width. The average number 

 of eggs found in the abdomens of a number of specimens examined was 10. 



Winged male. — Head and thorax light olive green, abdomen pale yellow 

 green with conspicuous black markings. Antenna; black, excepting two basal 

 segments, as long as bodv, and with circular sensoria on segments III, IV and V, 

 as follows: 12-15 in a row on III, 2-4 on IV, and 3-5 on V. (PI. XXIII, fig. 31.) 

 Eyes black. Beak black at tip and not reaching to coxae of middle pair of legs. 

 Wings hyaline, with dark wing veins slightly margined with brown, and a very 

 small brownish patch at end of each vein; stigmal vein obsolescent; the terminal 

 fork of the discoidal branching at about one half the distance from the margin 

 to where the discoidal first branches. Abdomen with a longitudinal row of large, 

 black, oval spots on each side of the dorsal median line, and each spot bearing 

 one or two very fine seta;; also there is a siinilar row of smaller setiferous spots 

 on each side, and between these markings and those on the dorsal median are a 

 few scattered and irregularly placed spots. Cornicles tubercular and dusky. 

 Style globular, dusky, and edged with black. 



Measurements. — (From four males; two in balsam taken on Trifolium pra- 

 tense, November 15, 1907, and the others reared in the insectary February 1, 

 1908, and measured immediately after mounting in balsam.) Length of bod)", 

 1.091 (body somewhat shrunken) — 1.382, average, 1.261 mm.; width, 0.509- 

 0.582, average, 0.536 mm.; expanse of wings, 4.1571 mm. ; length of wings, 1.827 

 mm.; antenna, I, 0.068; II, 0.054; III, 0.472-0.554, average, 0.513; IV, 0.277- 

 0.358; average, 0.309; V, 0.261-0.318, average, 0.292; VI, basal, 0.138-0.163, 

 average, 0.153; VI, filament, 0.146-0.163, average, 0.156; total, 1.545 mm.; 

 cornicles, 0.049 mm.; hind tarsus, 0.130 mm. 



