136 MISCELLAiSTEOUS PAPERS. 



OVIPAROUS GENERATION. 



Before first molt and less than, 2}^. liours oZc?,— General color pea- 

 green. Beak not reaching beyond the coxae of the third pair of legs, 

 apical segment dark. Antennae colorless, except last segment, which 

 is darker than the remainder. Eyes black. Legs pale, except the 

 tarsi, which are black. Measurements: Length of body, 0.954 mm.; 

 width, 0.486 mm.; antenna, I, 0.038 mm.; II, 0.038 mm.; Ill, 

 0.114 mm.; IV, 0.153 mm.; total 0.343 mm. 



After first molt and 5 to G days old. — General color dirty pea- 

 green, with very slight tinge of red. Last segment of antenna dark. 

 Tarsi black. Measurements: Length of body, 1.145 mm.; width, 

 0.573 mm. 



Oviimrous female after third molt. — Color of head and first 

 thoracic segment very dark green. Eemainder of body slate-gray, 

 with a reddish tint. The bloom which covers the body gives to the 

 aphis the grayish color. Tips of antenna^ dark. Tarsi black. Cor- 

 nicles darker than body color, with a black ring at the base of each. 

 Measurements: Length of body, 1.985 mm.; width, 1.050 mm. 



Adult wingless oviparous female. — General color plumbeous, which 

 is due to the bloom covering the body. Head black, and first thoracic 

 segment very dark beneath the bloom. Abdomen tinged with pink. 

 In alcoholic specimens from which the bloom has been removed, the 

 markings as in the pseudogynes, except that the black markings 

 on the last 3 abdominal segments are not present. Antenna^ dark, 

 with one large circular sensorium near the apical end of the fifth 

 segment, and several at the apical end of the thickened base of the 

 sixth. Beak reaching beyond the middle coxae. Eyes black. Legs 

 dark; the hind tibiae noticeably swollen and thickly covered with 

 small circular sensoria. Cornicles black and of the same shape as 

 in the pseudogynes. Apical half of style dark. Measurements: 

 Length of body, 2.201 mm.; width, 1.218 mm.; antenna, I, 0.038 mm.; 

 II, 0.047 mm.; Ill, 0.172 mm.; IV, 0.070 mm.; V, 0.095 mm.; VI, 

 basal, 0.100 mm.; filament, 0.154 mm.; total, 0.682 mm. 



Male after third molt. — Head and first thoracic segment pale green, 

 between pea-green and sage-green. Abdomen drab. Measurements: 

 Length of body, 1.546 mm. ; width, 0.687 mm. 



Adult wingless male. — Head black. Thoracic segments each wnth 

 a transverse black marking, this giving the thorax a blackish appear- 

 ance. Similar but shorter markings occur on the first 3 and the 

 last 3 abdominal segments. The spots on the sides of the body are 

 arranged in more or less uniform rows. Third antennal segment 

 wdth 12 or more sensoria irregularly distributed, most numerous near 

 the apex; fourth with 5 to 7 sensoria; fifth with 2 to 4 similar 

 sensoria and a larger one near the apex; and several at apex of the 

 basal part of the sixth. Eyes black. Antennae, legs, and cornicles 



