THE COXCHUKLA. 
03 
history and habits treated of in connection with the description of 
the species. 
The following table summarizes the data on parasitism by Tdeno- 
mus ashmeadi obtained during the season of 1905: 
Table XXX. — Parasitism of eggs of the conchuela by Telenomus ashmeadi in 1905. 
When collected. 
Localitv. 
Egg-batches. 
Number 
collected. 
XnmhPr Per cent Per cent 
V.^;? v„™w from which from which 
parasit- Number. parasite bugs 
emerged. hatched. 
ized 
1905. 
Julv 7 Tlahualilo.Durango, Mexico 
Julv 12 do 
Julv 17 do 
August 11-12 Barstow, Tex 
September 12 do 
Summary 
3-:. 
1.221 
a Fifty-one per cent contained parasites; 25 per cent failed to emerge. 
As stated by the writer in previous publications, the percentage of 
eggs from which adult parasites emerge does not indicate necessarily 
the number of bug 
eggs which are ac- 
tually prevented 
from hatching by 
these beneficial in- 
sects. Both in the 
laboratory and in 
the field many par- 
asites reach matu- 
rity, but for some 
unknown reason 
fail to emerge. In 
many cases the 
pal' asites make 
holes with thei r 
mandibles in the 
egg-shells of the 
bugs in which they are incased, nearly large enough to permit o( escape, 
and then die, apparently becoming exhausted by their efforts. Other 
in parasitized batches fail to hatch, or produce adult parasite.-, 
containing nothing but a shriveled, brownish, and structureless mass. 
The failure of such eggs to produce nymphs seems to be usually due 
to parasitism. Possibly in such cases the larva of the parasite died 
soon after having accomplished the destruction of the host egg. The 
tabic leaves unexplained the failure to hatch of about 30 per cent of 
-Tdfnomus ashmeadi, an important egg parasite of Ptntoioma 
ligata: Adult female and antenna of male. Eighty magnified. (Author's 
illustration.) 
