32 Annals Entomological Society of America [Vol.11, 



(unlike the style of the viviparous female in that there is no constriction near 

 the base), and 12 to 15 hairs projecting caudad. (PI. V, fig. 6.) Anal plate 

 larger than the style, similarly rounded, and with numerous hairs over its sur- 

 face. (This differs from the anal plate of the viviparous female in that it is not 

 divided or bifid.) 



Measurements [taken from 10 specimens (Chicago, 111., September 21, 1908) 

 mounted in balsam]. — Length of bodv 2.00-2.54, av. 2.28 mm. ; width, 0.82-1.21, 

 av. 0.97 mm. ; antenna, I, 0.13; II, 0.065; III, 0.92-1.06, av. 0.98; IV, 0.54-0.67. 

 av. 0.60; V. 0.42-0.50, av. 0.47; VI, base, 0.23-0.27, av. 0.25; VI, filament, 0.52- 

 0.65; av. 0.61 ; total average, 3.105 mm. ; cornicles, 0. 120 mm. ; style, 0. 10 mm. ; 

 hind tarsus, 0.16 mm. 



Winged male : — The males are similar to the winged viviparous females but 

 they may be easily distinguished from them as follows: Antennal segment III 

 of male with one third to one half more sensoria than the equivalent segment of 

 the female antenna, and they extend the entire length of the segment in the for- 

 mer while in the latter these sensoria are found only on the basal two thirds. 

 Further, the abdominal segments of the male have short transverse bands on the 

 dorsum, these being absent on the abdomen of the winged viviparous female. 



(Described from winged males collected in copula, at Chicago, 111., Septem- 

 ber 21 and 28, 1908.) Head pale greenish with more or less of a brownish tint, 

 in a few cases dusky; with noticeable frontal antennal tubercles; the medial 

 ocellus prominent and projecting beyond the fore border. Antenna? nearly bare ; 

 24-28 transverse (usually a few are circular) sensoria in a row the entire length of 

 III, the usual large elongate sensorium at end of V and a similar one, with several 

 smaller sensoria bordering it, at distal end of the basal portion of VI ; nearly twice 

 the length of the body, III the longest, being one third longer than IV, IV usually 

 slightly longer than filament of VI, often IV and filament of VI subequal and 

 occasionallj^ the latter slightly the longer, V one half or slightly more than one 

 half of III, base of VI one third to one fourth the length of filament of VI and 

 together they are longer than IV but shorter than III. (PI. V, fig. 7.) Seg- 

 ments I and II pale greenish, III dusky or brownish at base, the distal half dark- 

 ening to black, IV black excepting basal one third which is pale or dusky, V 

 and base of VI black except the basal thirds of each, which are whitish, filament 

 of VI black. Eyes red. Beak not reaching to cox£e of second pair of legs. Pro- 

 thoracic segment pale greenish with an almost square brown marking on the 

 median dorsum. Thoracic shield dusky brown. Wings hyaline, basal two 

 thirds of the stigmal vein subobsolete, stigma pale, costal and subcostal veins 

 pale brownish, remaining veins blackish, and a small dusky brownish area at the 

 end of each vein except the costal and subcostal, and usually the first and second 

 anal. (PI. V, fig. 8.) The first and second discoidals branching at about one 

 half the distance from the margin to the third discoidal. Legs with femora 

 pale brownish, tibiae black at extremities and brownish in the middle, tarsi entire- 

 ly black. Abdomen pale yellowish green with a median longitudinal black mark- 

 ing on the dorsum, consisting of short transverse bands ending on the antepenul- 

 timate segment. A longitudinal row of fine hairs on the dorsum extending along 

 the outer portion of the black patch (two hairs to each segment, one on each 

 side), a very small pale area at the base of each hair (in specimens mounted in 

 balsam). Cornicles and style pale yellowish green in color and characteristic 

 of this genus. 



Measurements [from 10 specimens mounted in balsam, collected at Chicago, 

 111., September 21 and 28, 1908]: — Length of body, 1.36-1.86, av. 1.61 mm.; 

 width, 0.52-0.68, av. 0.57 mm. (at base of cornicles the average width is 0.40 

 mm.) ; length of wing, av. 3.00 mm. ; width, av. 0.93 mm. ; wing expanse, approx. 

 6.50 mm.; antenna, I, 0.13; II, 0.065; III, 0.83-1.08, av. 0.93; IV, 0.56-0.70, 

 av. 0.64; V, 0.44-0.54, av. 0.50; VI, base, 0.18-0.24, av. 0.21 ; VI, filament, 0.54- 

 0.69, av. 0.62; average total, 3.095 mm.; cornicles, 0.09 mm.; hind tarsus, 0.16 

 mm. 



Egg: — Pale orange when first laid, and later changing to jet black. 



