20 



Psyche 



[April 



Descriptions. 

 1 . A. malif oliae Fitch (Rosy Apple Aphis) . 

 Light to dark green, anterior portion of thorax (first two seg- 

 ments as a rule) usually lighter (light green may have a yellowish 

 tint); anterior and dorsal aspects of head, antennae, base and 

 nearly | distal portion of rostrum, legs, apices of cornicles, and as 

 a rule two transverse bands or lines at anal end of dorsum, dusky to 

 black; the remainder of cornicles often dusky or brownish; eyes 

 dull black (in balsam-mounted specimens deep red); as a rule a 

 pale median longitudinal line on dorsum of head; often a small 

 dusky median spot on the first thoracic segment (in good light 

 seen to be interrupted medianly and longitudinally) and one on 

 each side of the thoracic segments; caudal end of abdomen ven- 

 trally dusky sometimes ; dorsum of head and thorax and the whole 

 of the ventral surface of the insect more or less pulverulent. 

 Newly-hatched specimens are light green as a rule, with head, 

 thorax, and posterior portion of abdomen at sides, occasionally, 

 pale yellowish-green; appendages similar to head and thorax, 

 although the antennae and legs are more often almost colorless; 

 eyes deep red. 



Antennae comparatively long and varying in extent from end of 

 thorax nearly to bases of cornicles, 

 unguis about twice as long as base of 

 distal segment, segments as follows: 

 III .1155-.1386 mm., IV (base) .0539- 

 .0616 mm., IV (unguis) .1001-.1309 

 mm.. Ill with a distal sensorium and 

 base of IV with a distal group composed 

 of one large one and several smaller 

 ones. III and IV imbricated but III not 

 as strongly, III sometimes showing 

 faint line of differentiation of future 

 segments III and IV, the whole with a 

 few short spinelike hairs ; cornicles long 

 .0770-. 0847 mm., broad, cylindrical or 

 subcylindrical (in some balsam-mounted 



Fig. 1.— Antenna and corni- specimens distinctly tapering), flanged 

 cle of Aphis malif oliw Fitch. . «. • i i • i • 



about X150. at apices, often m part weakly imbri- 



or I 



b«.se 



