INVERTEBRATE ENEMIES OF ALETIA. 
89 
little good is to be expected in this direction. A nnmber were obtained 
from New York and let loose in 1870 at Macon Station, Ala., but did not 
colonize, while in Texas they seem unable to endure the intense sum- 
mer heat, for, while they are found below latitude 30° in winter, they 
migrate north during the hotter months, or just when they would be 
most useful in the cotton field. It must also be borne in mind that this 
bird, except during the breeding season, is more graminivorous than 
insectivorous. The almost universal opinion of naturalists is that the 
introduction of this sparrow was a great mistake, and that its spread 
should be prevented by every possible means. 17 
The little tree frogs (genus Jlyla) are very often met with on the cot- 
ton plants in certain parts of the cotton belt, and they doubtless take 
their share of the worms. The Green Lizard (Anolis principalis) is also 
frequently to be found upon the plants, while the Ground Lizard (Oligo- 
%oma laterale) occurs in the fields and eats caterpillars with avidity. 
nrVBBTKBRATMB. 
These consist principally of liexapods or true insects. The spiders 
(Arachnida), however, furnish a number of species which prey upon 
the worms. The following species have been collected upon the cotton 
plant: Oxynpes viridanx Ilentz, 28 Theriduhi splicer ula Em., Euryopis fu- 
mbris Em., Attus fnsciatus Ilentz, Epeira stellata Ilentz, IAnyphia com- 
munis Ilentz, Tetratjnatha extensa Walk., Xysticus quadrilineatus Key- 
serling, Mcsumcna <jeor<jwna Keys., and Argiopc fasciata (IIz.). 
The first-mentioned species is widely distributed and nests on cotton, 
although usually it is not very abundant. The notion prevailing in 
MOM parts of the country that this spider is confined to the cotton 
plant is incorrect, as the species is also found abundantly upon weeds, 
especially in moist places. Mr. Hubbard has found it common upon 
cotton in Florida, and has seen it eating bees, leaf-hoppers, and other 
insects, but it never seemed to take the slightest notice of Cotton Worms, 
and remained for hours upon the same leaf with a worm without show- 
ing the least inclination to molest it. Mr. Sehwarz, however, has seen 
it feeding upon the worms both in Texas and in Alabama. 
l'REDACEOUS INSECTS. 
Of true insects which, from their well-known carnivorous propensi- 
ties, might with safety be placed among the natural enemies of the 
Cut ton Worm, there are a very great many, especially among the Cole- 
optera and Heteroptera ; but we shall refer only to those which have been 
actually observed to feed upon them; and then note some of the species 
commonly found in the cotton field, and which presumably have the 
same habit. 
IlroiENOPTERA : Wasps, Ants, etc. — In this Order none are of greater 
importance than the ants. A careful observer, while going through any 
cotton field the latter part of summer, has no difficulty in observing the 
