CL 4Lo 
RS 
QRS 33-20-| 
July 1963 ARS-33-20-1 
United States Department of Agriculture 
Agricultural Research Service 
KEYS FOR THE IDENTIFICATION OF SOME LEPIDOPTEROUS 
LARVAE FREQUENTLY INTERCEPTED AT QUARANTINE ay 
The following keys are intended to assist’ uarantiné spectors in recognizing 
the lepidopterous larvae most frequently intercepted at por fentry. They are based 
on the differential characters noted in the literaturé »and*on the larval collection and 
host catalog in the United States National Museum. 7 4 
NH ; 
It should be borne in mind that the validity of the keys is dependent on three 
factors--viz, (1) structure, (2) origin, and (3) host. Moreover, the characters used 
for separating the families are not completely diagnostic for the entire family but will 
serve to separate the species treated here. 
The drawings are diagrammatic and not complete in all details; only those 
characters referred to in the text are figured. In checking against setal maps showing 
lateral views, the head of the larva should be to the observer's left; in dorsal views the 
head should be toward the observer. The specimen should be placed in a Syracuse 
watch glass, immersed in alcohol, and examined under a low-power binocular micro- 
scope. 
1/ Originally published as Bureau of Entomology and Plant Quarantine E-475, 
May 1939, and revised as ARS-33-20, April 1956. Changes in the original version 
are chiefly nomenclatural. 
