SYSTEMATIC POSITION AND STRUCTURAL DETAILS. 77 
later letter he asserts that the insect in question is the periodical 
Cicada with which he is familiar. 
An addition to this record was received in 1898 in a postal from 
Mr. J. W. Seaton, Strasburg, Cass County, Mo., who reports that 
they appeared there in the summer of 1892, as they did also in 1896 
(Brood XX1I), being numerous both years. 
The State and county records are: 
LovuIstANa.—Morehouse. 
Missourtr.—Cass. 
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tig. 20.—Map showing distribution of Brood XXX, 1918. 
SYSTEMATIC POSITION AND STRUCTURAL DETAILS. 
The periodical Cicada belongs to the Homoptera, one of the two 
divisions of the Hemiptera, or great order of sucking insects, familiar 
to the public mind under the name of “bugs,” and including, in addi- 
tion to the graceful and attractive species like the Cicada, such foul- 
smelling species as the plant bugs, squash bugs, and certain animal 
parasites. The members of the suborder Homoptera, to which the 
Cicada and its allies belong, are, however, distinctly removed from 
the lower suborder of “bugs” just referred to, namely, the Heterop- 
tera, and as a rule lack the disgusting odor and habits of the latter 
and less esteemed suborder of sucking insects. The Homoptera as a 
rule comprise clear-winged insects, which subsist on the juices of 
