THE POTATO TUBER MOTH. 
41 
The record of a shorter life cycle follows : 
1913. 
September 15.— Tuber-moth larva parasitized by Habrobracon johannsem. 
September 18.— Parasite larvae nearly mature. 
September 19.— Parasite larvae spinning cocoons. 
September 20.— Parasite larvae pupating. 
September 25.-4 parasite adults issued. 
September 26.— 17 parasite adults issued. 
Life cycle 10 days at an average mean temperature of 78° F. 
CHELONUS SHOSHONBANORUM VIER. 1 
This parasite (fig. 29) has been consistently abundant every year from 
1912 to the present time. Efforts to rear it from the larvae and 
pupa3 of the tuber moth 
failed, and, at the sug- 
gestion of Dr. Howard, 
the insect was placed 
with eggs of the tuber 
moth. Oviposition (fig. 
30) took place at once, 
the parasites usually 
feeding on the moisture 
which collected at the 
wound caused by the 
ovipositor. 
The eggs of the tuber 
moth hatched normally, 
and the young larvae at 
once burrowed into the 
tuber. Later the mature 
tuber-moth larvae began 
to leave the tuber and start their cocoons. Some of the larvae ap- 
peared restless and darkened spindles were noticeable in their bodies 
(fig. 31), quite similar to those in the case of Campoplex pfitTiorimaeae. 
None of the larvae pupated, and soon the mature parasite larva (fig. 32) 
emerged and spun its white cocoon within the cocoon of its host. 
This parasite promises to be of value in controlling the tuber moth 
in the field. It apparently does not work in darkened bins„ 
The life cycle is divided as follows: 
1914. 
July 26. — Tuber-moth eggs parasitized by Chelonus shoshoneanorum. 
July 31. — Tuber-moth eggs hatched. 
August 16. — Chelonus larvae mature. 
August 18. — Chelonus larvae pupating. 
August 26. — 1 Chelonus adult issued. 
August 27. — 3 Chelonus adults issued. 
August 28. — 2 Chelonus adults issued. 
Life cycle 31 days at an average mean temperature of about 72° F. 
Fig. 31.— Larvae of tuber moth para- 
sitized by Chelonus shoshoneanorum. 
Much enlarged. ( Original . ) 
Fig. 32.— Chelonus sho- 
shoneanorum: Mature 
larva. Much enlarged. 
(Original.) 
Chittenden No. 2230°5. 
