30 MISC. PUBLICATION 344, U. S. DEPT. OF AGRICULTURE 
apical teeth of approximately equal size but with none of 
these conspicuously larger and more prominent; pygidial and 
lateral marginal plates mostly tapering and ending in one 
conspicuously elongate extension; dorsum of pygidium on 
each side, in addition to sclerotization associated with duct 
openings, with 3 small, oval, independent sclerotized flecks, 
1 anterior to fourth lobe and 1 in corresponding position on 
Z secments precedine: thiseans= === ssa cinerea Hadden 
ee. Normally without dorsal pygidial macroducts within frame of 
paragenitals; if present through variation or abnormality, 
then other characters not in above combination; pygidial 
lobes less prominent, once notched externally; fourth lobe 
various; plates not elongate tapering as in cinerea; without 
or, at most, with only a single, tiny sclerotic fleck near 
pygidial margin dorsally. 
f. Abdomen with dorsal intermediate macroducts above 
anterior paragenitals and on segment anterior to these, 
sometimes, in addition, on the second segment anterior 
to these, and, rarely, within the frame of the paragenitals 
as well; no invaginated membranous derm pocket out- 
side of each posterior spiracle; fourth lobes represented 
by an unsclerotized projection much resembling adjacent 
PVR OS Ses ee Ee ee ee ee pittosport Mask. 
ff. Normally without dorsal intermediate macroducts on 
pygidium; if present through variation or abnormality, 
then other characters not in above-described combina- 
tion. 
g. Without an invaginated membranous pocket in ventral 
derm between posterior spiracle and body margin; 
eyespot small, inconspicuous, often difficult to locate; 
fourth lobe a fairly broad sclerotic projection of 
pygidial margin with teeth along outer margin, one 
of which characteristically is conspicuously larger 
than the others, and may be so developed as to trans- 
form the lobe into a short, broad, sclerotized spur___ 
pergandii Comst. 
gg. With a small, but distinct, invaginated membranous 
pocket in ventral derm between each posterior spi- 
racle and body margin; fourth lobe various, but not 
exactly as in preceding. 
h. Eyespot modified to form a stout spur, projecting 
from body margin or placed close to margin (must 
be differentiated from adjacent, often very simi- 
lar, duct tubercles); without small isolated scle- 
rotized flecks on dorsum of pygidium. 
7. Fourth lobe a membranous projection of pygi- 
dial margin closely simulating adjacent plates 
in structure and appearance, although usually 
TMC he sia ers cee eee proteus (Curt.) 
ii. Fourth lobe slender, almost spurlike, definitely 
SClerObIZeC == es ea eee crotonis Dougl. 
hh. Eyespot various, flat, irregular, sometimes almost 
hemispherical, and sometimes so obscure as to 
appear lacking, but in no case appearing as a 
strong spur on or near body margin; in 2 or 3 ; 
species with a tiny circular to oval sclerotized | 
fleck anterior to fourth lobe or near margin be- 
tween third and fourth abdominal segments, the | 
third species with paragenitals normally in 2 | 
instead of 4 groups. 
j. Fourth lobe developed as a more or less 
strongly sclerotized projection of pygidial 
margin; paragenitals normally in 4 dis- 
tinctly separated groups; normally with 
microducts above anterior paragenitals 
and at anterior margin of dorsal sclero- 
tized area of pygidium; with a tiny sclero- 
tic fleck on pygidium as above described. 
