166 MISCELLANEOUS PAPERS. 



distinct sensorium, while at the apex of the thickened base of the 

 fourth are one or more indistinct sensoria. Thorax with dark patches 

 covering about one-half of the dorsal surface. xVbdomen with dark 

 markings which appear only after the aphis is at least one day old. 

 Abdomen with 4 distinct dorsal rows of tuberculate spines, 2 on either 

 side of the median line, and at least 1 lateral row on each side. At 

 the base of each of these spines is a small darkened area. The small 

 indistinct cornicles are surrounded with dark circular patches. The 

 opening also is marked by a dark ring. Measurements: Length of 

 body, 0.763 mm. ; width, 0.362 mm. 



Female after second molt and 7 or 8 days old. — General color light 

 apple-green. Antenna? lighter than body color excepting second 

 segment and tip of last segment. Spine spots bice-green in color. 

 Tarsi black. Measurements: Length of body, 1.331 mm.; width, 

 0.581 mm.; antenna, 0.537 mm. 



Female after thii^'d molt. — General color apple-green, becoming 

 paler and with a yellowish tinge at the caudal end. Head lighter than 

 body color. Ej^es reddish brown. Antennas pale, excepting the last 

 segment, which is darkened. That segment which in the earlier 

 stages represents the third is now indistinctly separated into 2 seg- 

 ments, ^he sensorium at the distal end of the fourth (the third of 

 the earlier stages) is quite distinct. The apex of the thickened base 

 of the last segment has numerous distinct sensoria. Legs pale, 

 excepting tarsi, which are black. Cornicles more distinct. Measure- 

 ments : Length of body, 1.775 mm. ; width, 0.725 mm. 



Adidt icingless oviparous female. — Head, first 2 thoracic segments, 

 and tip of abdomen oil-green in color. Abdomen parrot-green, shad- 

 ing at extremities to oil-green. Eyes dark reddish-brown. Antenna? 

 5-segmented; 1 sensorium at distal end of fourth and several at the 

 end of basal part of the fifth ; bristles fcAv but conspicuous, there being 

 2 on each of the 2 basal segments, 3 or \ on the third, and 1 on the 

 fourth. Projecting forward from the head and between the bases of 

 the antenna? are 6 distinct bristles. Beak short, not extending farther 

 than the coxa? of the second pair of legs. On the dorsal surface of 

 the body are 4 rows of small transverse dashes, 2 on each side of the 

 median line ; also 8 rows of tuberculate bristles, 4 on each side of the 

 median line. Hind tibiae noticeably swollen and bearing numerous 

 circular sensoria. Style upcurved. Cornicles as in all the other forms 

 of this species. Measurements (alcoholic specimens) : Length of 

 body, 1.67-1.92 mm.; width, 0.72-0.83 mm.; antenna, I, 0.065 mm.; 

 II, 0.065 mm.; Ill, 0.244 mm.; IV, 0.130 mm.; V, basal, 0.106 mm.; 

 filament, 0.236 mm. ; total, 0.846 mm. ; style, 0.078 mm. 



Male after second Tnolt and 8 or 9 days old. — General color citron- 

 yellow. Antennae 5-segmented. Sensoria at end of fourth and at 



