ECONOMIC ENTOMOLOGY. 
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RHOPALOCERA— Butterflies —The antennae knobbed. 
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PAPILIONIDiE. 
Owing to the confusion that has existed in the arrangement of the 
Butterflies, or the “ Day-flyers,” as they are sometimes called, they 
have been grouped for convenience under this one family, but as the 
recent catalogue of W. H. Edwards, of Coalburgh, W. Va., gives a 
more' satisfactory arrangement, and one that is likely to come into 
general use, we will use the family names as there given. In their 
more restricted sense the butterflies embraced in the Papilionidae may 
be known by their broad wings, erect in repose; the antenme slender 
and knobbed at the end, the knob either straight or slightly curved 
upward. They have six feet, all adapted for walking, and the front 
legs are not atrophied as in some of the other families. 
Of this family the genus Papilio , or the u Swallow-tails,” have the 
margin of the hind wings next to the body concave, and a tail-like 
appendage near the anal angle, sometimes nearly as long as the rest 
of the wing. The larvse of these are provided with two retractile 
tentacles or scent organs protruding from the first segment, from 
which a strong odor is emitted when the insect is alarmed. The rest 
of the family are without tails to the hind wings in th J perfect in¬ 
sects, and that inner margin of the hind wings is convex and bent 
downward, so that the sides of the two wings form a gutter along the 
abdomen. The larvae are without the scent organs ot the true Papi- 
lios. 
Papilio Ajax, Linn.—The Ajax Butterfly. 
This insect has but little interest to the economic entomologist, for 
itsfood plant,the paw-paw, is used only to a limited extent by man; but 
as it is found in various parts of the State, and will be of interest to 
many, it may, be well to mention it here. Its wings are black, 
marked with greenish yellow bands, with a bright crimson spot at the 
anal angle of the hind wings, with the tail an inch long. 
