42 BULLETIN 427, U. S. DEPARTMENT OE AGRICULTURE. 
BASSUS GIBBOSUS SAY. 1 
Bassus gibbosus (figs. 33-35) attacks the half-grown tuber worm 
in leaf mines. Like Zagra?nmosomaJlavolineatum, it is apparently of 
minor importance, and probably for the same reason. 
Adults placed on potato leaves containing larva? of the tuber moth 
attempted oviposition, but frequently without success. The parasite 
is rather slow in oviposition, and the larva within the mine is given 
opportunity to escape the ovipositor. 
Fig. 33.— Bassus gibbosus: Adult female. Much enlarged. (Original.) 
This parasite appears in the greatest numbers during the late fall 
and winter. For this reason its life cycle is of rather long duration, 
as the following record shows: 
1915. 
February 8. — Tuber-moth larvse parasitized by Bassus gibbosus. 
April 2. — 1 parasite issued. (Male.) 
April 3. — 1 parasite issued. (Female.) 
April 7. — 1 parasite issued. (Male.) 
Life cycle 53 days at an average mean temperature of about 53° F. 
The parasite seems to be well distributed throughout southern 
California. 
i Chittenden No. 2230«. 
