1909] Studies on Aphididae II 31 



of copulation. During the period of oviposition the females 

 wander along the branches in search of suitable places on which 

 to deposit eggs. Upon finding such places — for example, a cre- 

 vice formed by a dormant bud or a small crotch where two small 

 branches or twigs unite — she extends the tip of the ovipositor 

 into the crevice and deposits the egg as far into it as possible. 

 This process requires from three to five minutes. Usually the 

 female seeks another part of the branch soon after laying the 

 egg, but seldom lays a second egg immediately. One individual 

 which had just oviposited was examined, and eight more well- 

 de\'eloped eggs were found in her body. 



DESCRIPTIONS. 



Winged viviparous female. — The description of the winged viviparous 

 female by Monell and Oestlund are quite complete, and further descriptions are 

 unnecessary except for the few remarks following: The basal two thirds of 

 antennal segment III bears 8 to 14 circular sensoria in a row. Usually the num- 

 ber is 12 or 13, and the extremes 8 and 14 are exceptions. Figure of the antenna 

 is given in plate V, figure 1. 



Wingless oviparous female. — Head pale whitish yellow. Prothorax pale 

 greenish yellow with a longitudinal brownish stripe on each side. The remaining 

 thoracic segments like the first except that the lateral marking, which continues 

 on these segments, changes to a decided green. Abdomen yellowish with a 

 slight greenish tint, and sometimes the orange-colored eggs show through the 

 body, giving it an orange tint. The lateral thoracic stripes continue along the 

 sides of the abdomen, widening on one of the anterior segments, but continuing 

 posteriorly to the cornicles as a narrow stripe. Immediately anterior to the 

 cornicles is a transverse hand of a brownish green color, which connects the green 

 lateral markings. Posterior to the cornicles the abdomen is pale greenish yellow, 

 with no noticeable markings. Sometimes the green markings above described 

 are very indistinct, and the abdomen, in this case, is of a cream yellow color. 



Head with slight frontal tubercles and a more or less conspicuous tubercle 

 on the front bearing the median ocellus, six moderately long capitate hairs pro- 

 jecting cephalad from the front, and one on each side of the dorsum of the head 

 at the base of the frontal tubercles. (PI. V, fig. 2.) Antenme longer than body, 

 usually about one and one half its length, segment III longest, being twice the 

 length of V, IV subequal with filament of VI, V about twice the length of 

 the base of VI, VI (base and filament) slightly less than III and the fila- 

 ment slightly more than twice the basal portion; distal halves of III and IV 

 with weak imbrication, distal half of V and all of VI with slightly stronger imbri- 

 cation, distal half of V and all of VI with slightly stronger imbrication; an 

 occasional minute capitate hair (Obj. 1-6) on the basal half of the antenucx; 

 1 to 7 (usually 2 to 4) sensoria near the base of segment III. (PI. V, fig. 3.) Seg- 

 ments I and il concolorous with head, III, IV, V, and base of VI with the basal 

 halves whitish yellow and the distal halves blackish, filament of VI entirely black. 

 In older specimens the antennas are entirely black excepting I, II and a small por- 

 tion at basal end of each of the remaining segments. Beak not reaching beyond 

 the cox£e of the second pair of legs. Eyes red. Legs with femora pale yellowish, 

 tibiae brownish excepting distal ends which are black, and the tarsi black. Hind 

 tibiae with the basal half noticeably swollen and bearing 75 ar 80 small, more or 

 less circular, and irregularly placed sensoria, most of which are borne oni:the 

 inner surface. (PI. V, fig. 4.) Abdomen with a transverse row of 6 or 8 tuber- 

 cles on each segment, each tubercle bearing a single moderately long capitate 

 hair. Cornicles typical of the genus, and of a pale greenish yellow color. (PI. 

 V, fig. 5.) Style concolorous with the cornicles, short and rounded at the apex 



