40 Annals Entomological Society of America [Vol.11, 



35 (usually 30 to 35) circular sensoria, irregularly placed on III, 11 or 12 on IV, 

 and 4 to 7 on V, with the usual larger distal ones on V and base VI ; about one 

 third longer than the body, III more than one half longer than IV, VI and V sub- 

 equal but IV usually slightly the longer, VI the longest, it being about one half 

 longer than the next longest segment (III), base VI subequal witlr I. (PI. VII, 

 fig. 30.) Ej-es dark red. Beak reaching slightly beyond the coxa; of the third 

 pair of legs. Thorax brownish. Wings as described for the viviparous female. 

 Legs with femora pale greenish excepting the distal ends, tibitc brownish except- 

 ing distal ends and tarsi black. Abdomen blackish (no color notes taken). Cor- 

 nicles as in the other forms, the basal half j)ale greenish and the apical portion 

 duskA' to black. Style pale brownish. 



Measurements [from specimens in Ijalsam]: — Length of body, l.Cil mm.; 

 width; 0.62; length of wing, 2.40 mm.; width, 0.86 mm.; expanse, approx. 5.25 

 mm.; antenna, I, 0.09; II, 0.075; III, 0.50; IV, 0.33; V., 0.28; VI, base, 0.08; 

 VI, filament, 0.80; average total, 2.215 mm. ; cornicles, 0.40 mm. 



The Button Bush Aphis. 

 {Aphis cephalanthi Thomas.) 



This species was first described by Thomas in 1877 from speci- 

 mens collected in southern Illinois on Cephalanthns occidentalis . 

 The only addition to the accounts of its distribution or life history 

 is a single record by Mr. J. G. Needham* of its occurence on the 

 button-bush at Lake Forest, 111. 



I have found it very abundant on the same species of shrub 

 at Chicago, 111., and Mr. J. T. Monell has kindly sent me authentic 

 specimens collected by him at St. Louis, Mo. September 29, 1908, 

 at Chicago, where the branches, especially the terminal shoots of 

 the button-bush were completely covered with this aphid, and 

 numerous eggs, which had been deposited without any seeming 

 care as to location, were found on the branches. 



DESCRIPTIONS. 



Winged viviparous female: — Head black, rounded at frontal margin, and 

 sometimes the median ocellus projecting slightly beyond the front. (PI. VII, 

 fig. 37.) Antenna blackish or black; 10-17 circular sensoria irregularly placed 

 on III, usually 1-0 on IV, the usual one at the distal end of V and a single large 

 one with several smaller ones about its margin, at distal end of base VI; total 

 length about three fourths that of the body, III about one half greater than 

 IV, IV and V subequal, VI the longest, being subequal to IV and V combined, 

 base VI about one third III and filament VI subequal to III but invariably very 

 slightly longer. (PI. VII, fig. 38.) Eyes blackish with a barely perceptible 

 reddisii tint. Beak nearly reaching the coxas of the hind pair of legs. Thorax 

 black. Wings hyaline, with pale veins, the first and second discoidals branch- 

 ing at a point varying from one third to nearly one half the distance from the 

 margin to where the third discoidal branches. (PI. VII, fig. 39.) Legs pale 

 brownish except at the joint of the tibia and femur, distal end of the tibia and 

 the tarsus, all of which are black ; the hind pair of legs usually has the distal half of 

 the femur likewise black. Abdomen dark greenish brown to reddish brown ; bear- 

 ing a row of white pulverulent spots on each lateral margin; in well prepared 

 balsam mounts a fleshy tubercle is seen on each side of each of the segments, 

 anterior to that bearing the cornicles and likewise on the segment posterior to 

 it; and a dark sprjt at base of each cornicle. Cornicles black, cylindrical, about 

 one half longer than the style, and not reaching the end of the abdomen. (PI. 



* Psyche, Vol. 10, Feb. 1903, pp. 20, 27. 



