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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
although distinct from, rubicundulus Van Duzee from Jamaica.” Ceralbo 
Island is situated near the southeastern end of Lower California. Bonc- 
quet (2) found the beet leafhopper and curly leaf beets in the Argentine 
Republic, South America. The specimens of E. tenella were determined 
by Mr. E. P. Van Duzee and are in the collections of the California 
Academy of Sciences. 
If the distribution of the beet leafhopper from Washington and Idaho 
south into Mexico represents the native home of this insect, then the 
natural enemies are not efficient agents of control. It is not to be as¬ 
sumed that all native insects are controlled by their parasites. 
Entomologists probably would immediately come to the conclusion 
that the beet leafhopper was accidentally introduced into the Argentine 
Republic, but a careful consideration as to the possibilities that such has 
occurred is met with difficulties. If eggs deposited in weeds, or nymphs 
or adults have been transported in hay or straw from a beet leafhopper 
territory to the Argentine Republic, none of the three could survive in the 
dried vegetation. The possibility of introducing this insect in connection 
with the sugar beet and stock beet does not seem plausible. The only 
possibility that the writer can think of is, that eggs deposited in the 
foliage of garden or red beets or swiss chard taken from the breeding 
grounds of the leafhopper and transported in cold storage on steamers to 
be used as a vegetable dish or greens for the crew or passengers, may 
have hatched if taken ashore in the Argentine Republic. It is question¬ 
able, however, whether the eggs would survive in cold storage during 
a long trip around Cape Horn, possibly before the Panama Canal was 
completed. If the pest was accidentally introduced, it could have es¬ 
tablished itself easily on plants of the family Chenopodiaceae, to which 
the sugar beet belongs. 
The distribution of insects is often limited by the geographical 
range of the native food plants. In all probability, the native host plants 
on which the summer and overwintering broods develop are repre¬ 
sentatives of the Chenopodiaceae. Dr. H. M. Hall (4), who has recently 
published a monograph on the Atriplex and other genera, has prepared 
for the writer a brief statement concerning the geographical distribution 
of the species of Atriplex and Chenopodium as follows: 
Atriplex. There are numerous species throughout western North America as far 
south as tropical Mexico, the number of species as well as individuals diminishing 
towards the South. Too little is known of the botany of tropical America, but the 
genus is well represented in the West Indies, and occurs in Honduras and Venezuela. 
There are 2 or 3 species in Peru and Bolivia, more in Chile, and several in Argentine. 
Chenopodium. C. murale, an introduced European weed, has been abundant 
