62 
Psyche 
[Sept.-Dee. 
the third instar and about double their length with each moult. 
During moulting the nymphs are in a vertical position with the 
head down. The nymphal stage requires about seventeen days 
and the adult stage lasts about thirty days. The usual life span 
including the period within the egg is fifty-three days. Silk is 
deposited by all nymphs and adults. Winter is probably spent 
in the adult or nymphal stage. 
Literature Cited 
1. Ball, A. Descriptive Note Concerning an Ectopsocus From the United 
States, Psocoptera, Peripsocidae. Mem. Soc. Ent. Belgique, Vol. 23, p. 188, 
PI. VI, figs. 1-6. 1930-31. 
2. Banks, N. New Neuropteroid Insects, Peripsocus pumilis sp. nov. Bull. Mus. 
Comp. Zool., Vol. 64, No. 3, p. 313, PI. VI, fig. 79. 1920. 
3. Chapman, P. J. Corrodentia of the United States of America: 1. Suborder 
Isotecnomera. Journ. New York Ent. Soc., Vol. 38, pp. 219-290, 319-403, 
10 Pis. 1930. 
4. McClure, H. E. Psocid Habits. Ent. News, Vol. 47, pp. 113-118, 143-146. 
1936. 
5. Sommerman, K. M. Rearing Technique For Corrodentia. Ent. News, vol. 45, 
pp. 29-39. 1943. 
6. Description and Bionomics of Ccecilius manteri n. sp. (Corrodentia) . 
Proc. Ent. Soc. of Washington, vol. 53, pp. 259-261. 1942. 
7. Spruyt, F. J. Notes on Alaptus psocidivorus Gahan, A New Species of 
Mymaridae (Hymenoptera) . Pan-Pacific Ent., Vol. 3, No. 4, pp. 182-184. 
April, 1927. 
8. Wachter, S. The Hatching of the Eggs of Peripsocus californicus Banks. Pan- 
Pacific Ent., Vol. 2, No. 2, pp. 87-89. Oct., 1925. 
Figure 1. 
Figure 2. 
Figure 3. 
Figure 4. 
Figure 5. 
Figure 6. 
Figure 7. 
Figure 8. 
Figure 9. 
Figure 10. 
Figure 11. 
Figure 12. 
Figure 13. 
Figure 14. 
Figure 15. 
EXPLANATION OF PLATES 
Plate V. 
Egg mass covered with silk threads. 
Mature egg. 
First instar (dorsal view) . 
Egg burster (enlarged). 
Third instar (dorsal view) . 
Sixth instar (dorsal view) . 
Female (lateral view) . 
Plate VI. 
(Scale of enlargement applies only to Figures 12 and 15.) 
Corn sheath. 
Corn leaf. 
Malformed short wing. 
Anomalous wing. 
Male (dorsal view) . 
Protruding male genitalia (dorsal view) . 
Normal wing. 
Male (lateral view) . 
