April 1956 ARS-33-20 


United States Department of Agriculture 
. = PARIMENT (F A: 
Agricultural Research Service (> : 
LIBRARY 
5 weer Ub 195 
KEYS FOR THE IDENTIFICATION OF SOME LEPIDOPTERQUS STSViLLE ERA 
LARVA FREQUENTLY INTsRCEPTED AT QUARANTINE 
By Hahn W. Capps, 
Entomology Research Branch 
The following keys are intended to assist quarantine inspectors in 
recognizing the lepidopterous larvae most frequently intercepted at ports 
of entry. They are based on the differential characters noted in the 
literature, and on the larval collection and host catalog in the United 
States ational Museum. 
In using the keys, it should be borne in mind that their validity 
is dependent on three factors--viz, (1) structure, (2) origin, and (3) 
host. ioreover, the characters used for separating the families are not 
completely diagncestic for the entire fawily but will serve to seperate 
the species treated here. 
The drawings are diagrammatic and not complete in all details, only 
such characters as are referred to in the text being figured. In checking 
against setal maps showing lateral views, the head of the larva should be 
to the observer's lefts; in dorsal views the head should be toward the 
observer, The specimen should be placed in a Syracuse watch glass, 
immersed in alcoliol, and examined under a low-power binocular microscope. 
1/ This is a revision of Bureau of Entomology and Plant Quarantine 
E-\75, issued in May 1939. The changes consist chiefly in bringing up to 
date the nomenclature of the species. 
