i-—S tructural characters of the species of Prociphilus. A , P. bumulae: Distal segments of antenna of 
spring migrant. B, P. poschingeri: Distal segments of antenna of spring migrant. C, P. venafuscus: 
Distal segments of antenna of spring migrant. D, P. venafuscus: Distal segments of antenna of fall 
migrant. E, P. pyri; Distal segments of antenna of fall migrant. E, P. xylostei: Distal segments of 
antenna of spring migrant. G, P. populiconduplifoHus: Distal segments of antenna. H, P. corrugatans; 
Distal segments of ant enna of spring migrant. I, P. corrugatans: Distal segments of antenna of spring 
migrant. /, P. alnifoliae: Distal segments of antenna. K, P. tessellatus: Distal segments of antenna. 
L, P. bumulae: Thoracic wax plates. M, P. poschingeri: Thoracic wax plates. N, P. xylostei: Thoracic 
wax plates. O, P. venafuscus: Thoracic wax plates. P, P, corrugatans: Thoracic wax plates. Q, P. pyri: 
Thoracic wax plates. R, P. alnifoliae: Thoracic wax plates. 5 , P. populiconduplifoHus: Thoracic wax 
plates. T, P. tessellatus: Thoracic wax plates. 
III7 
