%\\t Canadian Jlntomolugbt 



Vol. XLVI. 



LONDON, MARCH, 1914 



No. 3 



NEW OR LITTLE KNOWN SPECIES OF APHIDID/E. 



BY JOHN J. DAVIS, BUREAU OF ENTOMOLOGY, WASHINGTON, D.C. 



(Continued from page 51.) 



Wingless viviparous female. (PI. IV, figs. 11-13.) 

 Macrosiphum venaefuscae, n. sp. 



Body uniformly pale green. Antenna' blackish, excepting 

 segments I, II, and the extreme base of III, which are pale greenish 

 brown; placed on prominent frontal tubercles; sparsely setose; 

 1 to 3 circular sensoria in a row on basal portion of segment III; 

 filament of segment VI longest; total length greater than that of 

 body. Beak just reaching to coxa? of third pair of legs. Eyes 

 black. Basal half of femur with a slight greenish tint, the distal 

 half pale brown; tibia and tarsus blackish. Cornicles black, 

 reaching to or a little beyond tip of cauda; distal end plainly 

 reticulated and noticeably constricted; gradually tapering, the tip 

 being much narrower than base. Cauda approximately one-half 

 the length of cornicles, ensiform, and sparsely hairy. 



Measurements from specimens mounted on slides in balsam: 

 Length of body 2.55 — 2.75 mm., average 2.67 mm.; width of 

 body 1.20 — 1.35 mm., average 1.30 mm.; length of middle tibia 

 1.70 — 2.24 mm., average 1.98 mm.; length of hind tibia 2.44 

 — 3.02 mm., average 2.76 mm.; length of hind tarsus 0.135 mm.; 

 length of cornicles, average 0.942 mm.; length of cauda, average, 

 0.516 mm. Antennal measurements as follows: 



