<32 MAIXE AGRICULTURAL EXPERIMENT STATIOX, I913. 



36-04. Apterous and alate viviparous females collected from 

 Salix, Orono, June 14, 1904. 



88-12. Apterous viviparous females, Salix, Orono, July 16, 

 1912. 



Fig. 34. A. salicicola. Antenna of alate female. 

 Fig. 35. Cornicle of same. 



Aphis populifoliae Davis. Speckled Poplar Aphid. This 

 remarkable species found usually on the upper surface of poplar 

 leaves was described by Air. Davis under the name of Aphis 

 populifoliae (Fitch) in June, Econ. Ent. Vol. 3, 1910, p. 489. 



The alate viviparous female has the following characters. 

 Head black ; no frontal tubercles ; antenna with from about 

 20 to 30 sensoria on III, and few or none on IV relative length 

 of joints shown in Fig. 36; eyes black; beak black, extends to 

 between 2nd and 3rd coxse; prothorax black, lateral tubercles 

 prominent; shape and venation of wings as usual for Alacro- 

 siphum, Fig. 46 G, veins and stigma black; legs with femora 

 black, tibiae pale proximal '2-3 and black distal 1-3, tarsi black; 

 abdomen black or reddish black with snow white pulverulent 

 spots on dorsum arranged in transverse rows of one row per 

 segment, venter slightly powdered; cornicles long cylindrical 

 slightly swollen near base and black; style ensiform and up- 

 turned. 



The apterous viviparous female is in general appearance 

 black spotted with white. Head black, antenna (Fig. 38) black 

 except proximal III which is very pale ; sensoria present on 

 III ; eyes black ; prothorax black with 2 white dorsal dots, 

 tubercles present; thorax brownish black; legs with femora 

 mostly dark proximally pale, tibiae mostly pale, distally dark, 

 tarsi black ; abdomen brownish black with white pulverulent 

 spots and venter pulverulent; cornicles long, black, cylindrical, 

 slightly swollen near base. Fig. 39 shows cornicle drawn to 

 the same scale as Fig. 38. 



