1915] The Aphid Tribe Pterocommini 349 
Figure 1, Nectary of P. salicis; Figure 2, Nectary of form found in U. S. 
(bicolor? salicis?) possibly new. Figure 3, Nectary of P. bicolor; Figure 4, Nectary 
of P. flocculosa; Figures 5 and 6, Nectaries of P. smithie; Figures 7 and 8, Nec- 
taries of P. populea; Figure 9, antenne of P. smitihe; Figure 10, antenne of P. 
populea; Figure 11, antenne of P. flocculosa; Figure 12, antenne of P. bicolor; 
Figure 18, P. salicis. 
Pterocomma salicis Linn. 
Synonomy: Aphis salicis, Linn. Reaum., Fabr., Schrank, De Geer, Kalt. 
Melanoxanthus salicis Linn (Buckton). 
Melanoxanthus salicis Linn (Weed). 
Melanoxanthus salicis Linn (Packard). 
Melanoxanthus salicits Linn (Osborn). 
Melanoxanthus salicis Linn (Cowen). 
Melanoxantherium salicis Linn (Schouteden). 
Melanoxantherium salicis Linn (Gillette). 
Melanoxantherium salicis Linn (Wilson). 
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Since this species does not seem to occur in America it is 
not possible to secure a description from live material. A 
detailed description of what appears to be this species is given 
by Kaltenback and Buckton, figures accompanying the latter. 
Buckton’s description is included here with additional notes 
made by myself from material on slides and in alcohol. 
A pterous viviparous female. 
. Inch Millimeters 
SIE AOL © Gayen sey islets a oeaew en Reece 0.150 x 0.80 3.81 x 2.02 
Length of Antennz...............0:080 2.02 
ene thwoncOnaleles wre 0.015 0.38 
