2 PAPERS ON APHIDIDJE. 



small ones surrounding a larger one at distal end of base of VI; 

 total length about equal to that of the body ; segments III and fila- 

 ment of VI longest, the latter being slightly the longer of the two; 

 IV and V subequal, their total length being subequal to III; base of 

 VI about three-tenths the length of the filament or one-third of III, 

 (See fig. l,h.) Beak reacliing slightly beyond the coxae of the first 

 pair of legs. Legs dark brown excepting the basal one-third or one- 

 half of the femora and tibia?. Wings with the discoidal vein once- 

 branched, the branching being about two-thirds the distance from 

 the base to the tip of the wing, the basal end not contiguous with the 

 costal vein (occasionally one wing with the discoidal unbranched, 

 and in one case the brandling was at the extreme tip of the wing) ; 



Fig. 1. — Tnxoptera muhlenbergise: a, Winged viviparous female, greatly enlarged; h. antenna of 



same, more enlarged . ( O riginal . ) 



veins dark brown. Lateral abdominal tubercles inconspicuous. 

 Cornicles pale green, very slightly swollen in the middle, subequal 

 in length to the style. Style pale green, and slightly longer than the 

 liind tarsi. 



Measurements (from specimens mounted in balsam): Length of 

 body, 0.7999-0.9090 mm., average, 0.8471 mm.; width, 0.2909- 

 0.4181 mm., average, 0.3526 mm.; length of wing, average, 1.88 

 mm.; width, average, 0.636 mm.; antenna, I, 0.05 mm.; II, 

 0.041 mm.; Ill, 0.2119-0.2608 mm., average, 0.23 mm.; IV, 

 0.0978-0.1385 mm., average, 0.1124 mm.; A^ 0.1222-0.1467 mm., 

 average, 0.1325 mm.; VI, base, 0.0652-0.0896 mm., average, 

 0.0787 mm.; VI, fdament, 0.22-0.2689 mm., average, 0.2509 mm.; 

 average total, 0.8955 mm.; cornicles, 0.09-0.12 mm., average, 

 0.0986 mm.; style, 0.0978-0.1141 mm., average, 0.1048 mm.; hind 

 tarsus, 0.0978 mm. 



