252 Ann als Entomological Society of A merica [Vol . I , 



Professor Gillette described this species as M. braggii. His speci- 

 mens were collected on Canada thistle (Carduus arvensis) , and he 

 has since written me that he also collected it this spring (1908) 

 on Elaeagnus, and that he had found it on this tree only in the 

 spring previous to July i, which agrees with the observations of 

 Mr. J. T. Monell and myself. Mr. Monell sent me specimens of a 

 Myzus on a hardy Elaeagnus which proved to be of the same species 

 as those collected in Colorado and Illinois. These specimens 

 were collected May 10-13, i9°7' ^^ St. Louis, Mo., and Mr. Monell 

 writes that he has not found it after that date. This year (1908) 

 I first found winged migrants on Elaeagnus at Chicago, Illinois, 

 September 17, and each had given birth to several young of the 

 sexual generation. 



DESCRIPTION. 



Under the name, Ma^zus braggii, n. sp.. Professor C. P. 

 Gillette has described (Canadian Entomologist, January, 1908) 

 the winged male, and winged and wingless viviparous females, 

 and further descriptions of these stages are unnecessary. 



"Winged viviparous female, second generation from egg. — (Bred on 

 Elseagnus angustifolia) — Head dusky; on the front and between the bases of the 

 antennte are a few capitate hairs, and also a conspicuous prominence bearing the 

 cephalic ocellus; the frontal (antennal) tubercles slightly gibbous. (PI. XXI, 

 tig. 6.) Antennae dusky to black, excepting the two basal segments, which are 

 concolorous with the head; irregularly placed sensoria as follows: 14-39 (usually 

 25-35), on III., 7-17 on IV., 4-7 on V., and several smaller ones at the distal 

 end of the basal portion of VI.; subequal to the body in length; the first segment 

 gibbous. (PI. XXI, fig. 3.) Eyes dark red. Beak dark at tip, and not reaching 

 beyond the coxae of the second pair of legs. Thoracic plates light to darker 

 brown. Wings hyaline, the first and second discoidals usually branching at 

 about one half or slightly less, the distance from the margin to the third discoidal. 

 (PI. XXI, fig. 1.) Legsduskyand with a greenish tint, excepting the articulations, 

 which are darker, and the apical ends of the tibi:e and the tarsi, which are black. 

 Abdomen pale greenish, or yellowish green, with a darker quadrangular blotch 

 on the dorsum. Cornicles with the distal third incrassate; pale and almost 

 transparent, excepting the incrassated portion, this being dusky; extending 

 beyond the tip of the abdomen. (PI. XXI, fig. 8.) Style pale and with a greenish 

 tint, more or less ensiform in shape, and about equal to the hind tarsus in length. 



Measurements. — (The extreme, as well as the averages, from many speci- 

 mens measured, are given.) Length of body, 1.23 - 1.52 mm.; width, 0.472- 

 509 mm. ; length of wing, 2.00-2.50 mm. ; width, 0.72-0.90 mm. ; wing expanse, 

 4 70-5.60 mm.; antenna, I, 0.0652; II, 0.0489; III, 0.2771-0.4075, average, 

 3317; IV, 0.1467-0.2445, average, 0.2021; V, 0.1304-0.2282, average, 0.1793; 

 VI, basal, 0.0815-0.0978, average, 0.0896; VI, filament, 0.4401-0.6909, aver- 

 age 0.5676; average total, 1.4844; mm. cornicles, 0.2445-0.3586, average, 0.3015 

 mm.; style, 0.0978 mm.; tarsus, 0.0978 mm. 



Wingless viviparous female. — (Reared from eggs collected on Elaeagnus 

 angustifolia) . General body color cream yellow, the thorax and abdomen with 

 two longitudinal rows of more or less oblong, bright green markings. Head with 

 a number of capitate hairs projecting from the front. The two basal segments 

 of the antennae almost clear transparent or with a slight greenish tint; the 

 others, except the last two segments, which are dusky, are pale green. 



