2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
apparently it is seldom seen by the investigators, is destroyed during 
the preparation of the genitalia mounts, and is now missing from most 
slides. 
Busck (1939) illustrated the accessory bursa of several species but 
did not use it in his classification. His keys are based on male genitalia 
and wing venation. Razowski (1964) does not illustrate the accessory 
bursa at all, nor does he allude to it anywhere in his papers. At this 
time I am not using it in classification, although I am illustrating it 
wherever it could be found, but I believe that many more preparations 
of many species in numerous genera must be made before we can 
evaluate its true significance. In most species of most genera the 
accessory bursa has its inception posteriorly, either from the bursa 
copulatrix or the ductus bursae. In the species group consisting of 
vesta, tornosema, and charma this structure emerges anteriorly. Surely 
such differences are significant. The male vesta, the only male known 
for this group, suggests affinity with Phalonidia and Amallectis, but 
the females of these two genera do not exhibit the anterior origin of the 
accessory bursa. Since it is not clear at this time to what genus these 
three species are referable, I am placing them in the genus Phelonia 
until all the genera have been examined properly and revised. 
Unfortunately, phaloniids seldom are collected in sufficient series 
to permit exhaustive study, and all too frequently one or the other sex 
is missing. The state of our knowledge, therefore, is imperfect but it 
is hoped that papers such as this will point out the need for more 
material so that more complete treatments can be presented. There 
is an appalling lack of biological information on the New World 
species, particularly the Neotropical representatives, but it will be a 
long time before microlepidopterists will be able to devote time to life 
history studies in the latter region. In the meantime we must content 
ourselves with making known the existing taxa. 
The drawings of the genitalia were made by Mr. André del Campo 
Pizzini, staff artist. The photographs of the wings were made by Mr. 
Jack Scott and Mr. Victor Krantz. 
Hysterosia Stephens 
Hysterosia gigantica Busck 
Figure 1; Puate 1 (Fria. 5) 
Hysterosia gigantica Busck, 1920, Ins. Insc. Mens., vol. 8, nos. 4-6, p. 87. 
Female genitalia slide JFGC no. 11621. Ostium broad, slitlike, with 
posteroventral edge curved ventrally. Antrum membranous. Inception 
of ductus seminalis from deep concavity in side of bursa copulatrix. 
Ductus bursae very short; anterior portion ridged, the ridges con- 
tinuing into bursa copulatrix. Bursa copulatrix studded with spicules 
