U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 92 PLATE 23 
SPECIES OF Pit; YORHTHORUS 
37, Pityophthorus leiophyllae, antenna; 38, P. sambuci, antenna; 39, P. alni, antenna; 40, 
P. alni, fore tibia; 41, P. subopacus, antenna; 42, P. subopacus, fore tibia; 43, P. cili- 
atus, antenna; 44, P. ciliatus, fore tibia; 45, P. hidalgoensis, antenna; 46, P. rudts, 
antenna. 
U.S. GOVERNMENT PRINTING OFFICE: 1942 
