98 
Journal of Agricultural Research 
Vol. XXX, No. 2 
and position of the anterior bands and 
spine clusters, particularly in the ven¬ 
tral thoracic and head regions, and the 
arrangement of these as figured will 
probably prove to be only approxi¬ 
mately correct when prefect specimens 
of each species are available for study. 
Again, owing to the viccissitudes in¬ 
curred during the mounting of speci¬ 
mens often imperfect, the body has 
frequently become distorted in such a 
fashion as to make its true outline very 
uncertain and, in consequence, the 
body outline of any species, as shown 
in its figure, should not be regarded as 
necessarily correct, nor should any 
variation in this among species be re¬ 
garded as of taxonomic importance. 
The figures showing dorsal and ventral 
halves of the body are also incomplete 
in that they make no attempt to show 
and locate all of the setae and disk pores 
present in the derm of the insect, usually 
showing only those that appear to have 
some obvious or possible importance in 
relation to their classification. In spite 
of any such deficiencies, it is believed 
that these figures, if used in connection 
with the text, will greatly facilitate the 
recognition of the different species 
discussed in this paper. 
In the detail drawings of the spines 
from certain parts of the body of each 
species, an attempt has been made to 
show the average condition for each. 
Usually, however, since nearly all of 
these spines have not only a curved 
longitudinal axis, but vary from circu¬ 
lar to oval in cross sections at different 
points, the angle at which any spine 
lies under the microscope has a marked 
influence on its profile and should be 
given consideration when the spines 
are under examination. 
Most, but not all, of the photographic 
illustrations show the insects enlarged 
approximately seven and one-half times. 
The text should be consulted when 
accurate information as tp the size of 
a species is desired. The enlargement 
in the drawings varies and is indicated 
for each. 
GEOGRAPHICAL DISTRIBUTION 
The original natural distribution of 
the species of this subfamily, neces¬ 
sarily inferred in the case of some of 
the more widely distributed forms such 
as imignis, shows two rather striking 
characteristics which deserve mention. 
Thus, so far as records are available, 
there are no truly indigenous species 
in the Ethiopian, Oriental, and 
Australian regions, and the known 
species are predominantly Nearctic 
and Neotropical in distribution and 
only secondarily Palaearctic. 
The 40 members of the subfamily 
definitely recognized at present are 
given in the list below and their general 
natural distribution throughout the 
world is indicated on the accompany¬ 
ing maps (figs. 1 and 2). 
OBTHEZIA BOSC d’aNTIC 
Orthezia s. str. 
annae Cockerell. 
arenariae Vayssiere. 
artemisiae Cockerell. 
bailout, new species. 
boliviano, new species. 
caudata Ferris. 
cheilanthi Tinsley. 
galapagoensis Kuwana. 
garryae Cockerell. 
graminis Tinsley. 
grandis Hempel. 
insignia Douglas. 
lasiorum Cockerell. 
longipes Hempel. 
mexicana, new species. 
minor, new species. 
monticola Cockerell. 
nigrocincta Cockerell. 
nuda Ferris. 
olivacea Cockerell. 
praelonga Douglas. 
pseudograminis, new species. 
solidaginis Sanders. 
sonorensis Cockerell. 
Hllandsiae, new species, 
■ultima Cockerell. 
wrticae (Linnaeus). 
varipes Leonardi. 
yashushii Kuwana. 
Arctorthezia Cockerell. 
cataphracta (Shaw). 
ocddentalis Douglas. ; 
NEWSTEADIA GBEEN 
americana, new species. 
floccosa (De Geer). 
tristani (Silvestri). 
MIXOBTHEZIA, NEW GENU! 
cubana, new species. 
OBTHEZIOLA SULC 
fodiens Giard. 
vejdovskyi Sulc. 
