New York AgcriovuttusaAL Exprerment Station. 759 
Prof. Gillette* reports this pest as doing serious harm to onions 
in Colorado during July and August for the past two seasons. 
It was very destructive to onions in the eastern portion of Iowa 
during July of the present year. 
Dr. Lintner} mentions a thrips on cabbage in his ninth report 
and considers it a new species. 
Prof. Smith{ mentions a thrip very injurious to onions during 
the fall of 1890. Probably in both these cases these were Thrips 
alin. ) 
Dr. Packard in his Second Annual Report on the Injurious and 
Beneficial Insects of Massachusetts describes a thrips injuring 
onions but he considers it to be the “ wheat thrips” (Lzmothrips 
tritici). He estimated that at least $10,000 worth of onions in 
Essex county alone were destroyed by this pest. This does not 
appear to be identical with ._Zhrips aliz, but was probably what 
is now known as Thrips striatus. Prof. Gillette in bulletin 
referred to above treats of the “onion thrips” as Thrips striatus? 
but mistrusting it might be a different species suggests the name 
of Limothrips aliz. Miss Beach of the Jowa Agricultural College 
has since redescribed it and placed it in the genus Z/rzps, call- 
ing it Thrips alia. 
- Description. It canbe distinguished as follows: The wing- 
less forms are light yellow in color and about =; of an inch long. 
The winged specimens are more of an ash color. They run 
rapidly over the surfaces of the leaf and throw up the tips of the 
_abdomen in a threatning manner; this though is apparently done 
to aid in spreading the wings. The wings are four in number 
and when spread for flight as shown in Fig. a, Pl. II, they are 
seen to be fringed with hairs. (In the figure portions of the body 
are shaded too much.) The antenne are seven jointed. The 
eyes are quite large and dark colored. The main characters for 
distinguishing this from other species of thrips must be made out 
with the microscope. The number of antennal joints, the arrange- 
ment and number of spines on the wings and abdomen are the 
main specific characters. 
* Bull No. 24, Colo. Agrl. Exp. Sta., p. 13. 
+ Ninth Report on Injurious and Other Insects of N. Y , 1892, p. 145. 
t Report Ent. Dept. N. J., Agri. Coll. Exp. Sta. for 1893, p. 441. 
