22 



PAPERS ON APHIDID^. 



Eyes (lark re(i to brown. AntennEe about as long as the. body; 

 relative lengths of segments as for stem-mother; segment III bearing 

 9 to 12 oval sensoria in a row, and the usual ones at apex of V and 

 of base VI; concolorous with body at base, gradually darkeni.ig 

 towards apex (fig. 11, a). Beak not reaching coxae of second pair of 

 legs. Wings hyaline, veins dark brown to blackish, with a very 

 narrow brownish border, and small brownish areas at their apices; 

 basal half of radial sector (stigmai veins) obsolescent toward basal 

 half; terminal forks of the median (discoidal vein) branching at a 

 point slightly less than one-half the distance from the tip of wing 

 to where the media first branches; width almost one-half its length. 

 Legs concolorous with body, excepting tarsi, which are nearly black. 

 Cornicles dusky and about as long as the width at base (fig. 11, b). 

 Cauda globular and constricted at middle; a lateral view (fig. 11, c) 

 shows it to be decidedly upturned so that a dorsal view usually 

 shows it to be globular (fig. 11, d), although when pressed down, as 

 is usually the case in mounted specimens, it appears more or less oval 

 and pointed from tip from above (fig. 11, e). Anal plate dusky and 

 bilobed and described for the stem-mother. 



Measurements: Length of body, 1.345-1.564, average, 1.454 mm.; 

 width, 0. 582-0. G91, average, 0.642 mm.; expanse of wings, 4.654 mm.; 

 length of wing, 2.0 mm., width, 0.80 mm.; cornicles, 0.066 mm.; 

 Cauda, 0.139 mm.; hind tarsus, 0.129 mm.; antennal measurements 

 as follows: ^ 



1 From specimens collected at Urbana, III., except as noted. 



> Measurements by J. T. Monell from specimens collected by Paul Hayhurst, at Washington, D. C. 



8 Measurements by J. T. Monell from tj-pe specimens, which were collected at Washington, D. C. 



