TWO SPECIES OF MACROSIPHUM. 85 



Apterous viviparous female. — Color as with the winged vivi- 

 parous form. Antennae, length of segments : III, .8 to .96 

 mm., IV, .72 to .88 mm., V, .56 to .72 mm., VI, .16 to .2 mm., 

 VII, .96 to 1.2 mm.., total length of segments I to VII, average 

 about 4.05 mm. Cornicles .96 to 1.04 mm. in length, and 

 strongly reticulated at tip. Cauda .56 mm. Total length of 

 body to distal tip of cauda and exclusive of antennae, 4.05 mm. 



Apterous oviparous female. — Head pale, nearly white. An- 

 tennae with proximal joints pale, distal half dark. Length of 

 segments : III, .68 to .88 mm. ; IV, .56 to .68 mm. ; V, .52 to .64 

 mm.; VI, .16 mm.; VII, .96 to 1.04 mm.; total antennal length 

 I to VII average about 3.6 mm. Prothorax and thorax pale 

 like head. Legs with femora and tibiae, proximal portion pale, 

 distal portion dusky. Tarsi dark, .16 mm. long. Hind tibiae 

 conspicuously darker and much swollen and thickly set with 

 sensoria. Abdomen light salmon pink. Cornicles pale at base, 

 distal half dark and reticulated at tip; length .6 to .8 mm. 

 Cauda salmon pink, ensiform, length .32 to .4 mm. Total body 

 length to tip of cauda, antennae excluded, 2.13 to 2.15 mm. 

 The size of the hind tibiae of this form makes it readily distin- 

 guished from the apterous viviparous form and young, even to 

 the unaided eye. 



The pink variety has been described because these predomi- 

 nate among the oviparous females. The color scheme of the 

 green and yellow forms can be determined merely by substi- 

 tuting these colors for the salmon pink of the individual de- 

 scribed, the dark coloration being the same for all 3. 



Winged male. — Head and antennae dark brown. Length of 

 antennal segments: HI, .72 to .8 mm.; IV, .48 to .64 mm.; 

 V, .48 to .6 mm.; VI, .16 mm.; VII, 1.04 to 1.28 mm.; total 

 antennae length I to VII, 2.93 to 3.60 mm. Prothorax and 

 thorax dark brown. Wings deflexed, hyaline, veins dark and 

 very slender, stigma pale brown. Legs brown, darker at tips. 

 Abdomen brown. Cornicles pale brown, dark distally and reti- 

 culated, cylindrical, .48 to .56 mm. long. Total body length 

 exclusive of antennae and cornicles, 1.12 to 1.57 mm. The 

 thorax is large and strong, the abdomen much shrunken and is 

 rendered conspicuous only by the long cornicles. The male 

 is described from specimens in copulation, in order that no 

 mistake as to the identity of the species might occur. 



