72 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
of sete is nearer the median pair than is the caudal pair. The 
outer circle of pores is limited anteriorly by the cephalic sete. 
This row extends several pores caudad of the posterior sete. 
The row is double between the median and caudal sete for most 
of the distance. In the inner circle the number of denticulate 
pores is irregular. One denticulate pore on each side indents 
the membrane of the orifice at the caudal sete. Posteriorly 
from the caudad sete the circle continues as a single or double 
row of pores. The anterior concavity is broad and marked and 
is composed of a single row of cells. 
In the above description the close adherence to the generic 
type of the ring is noticeable. The specific variation is small, 
but remarkably constant for the several specimens of each 
species examined. It is doubtful, however, whether the anal 
ring will be useful in specific determinations because of the 
difficulty of making satisfactory mounts. Its usefulness as a 
generic character appears to be very striking, as it differs 
greatly from the anal ring of other genera as Orthezia, Ripersia 
and Pluto. 
POSTANAL SETA—(Figs. 1-5) 
Ventrad of the anal ring and at varying specific distances 
from it are two pair of sete. These sete have in each case 
been compared in a number of specimens and their size and 
arrangement is apparently subject to little variation. Follow- 
ing is a discussion of these sete. 
Longispinus Targ.—(Fig. 5). The cephalic pair* of sete is 
separated by a space equal to the diameter of a seta of the anal 
ring from the caudal horns of the inner circle of wax pores. 
The sete of this pair are separated by the width of the orifice. 
The posterior pair of sete are separated from the anterior pair 
by a distance equaling three-fourths the distance of the anterior 
pair of sete from the caudal pair of anal sete. The sete of 
the posterior pair are slightly nearer together than are the 
sete of the anterior pair. Lines drawn longitudinally through 
*For convenience in the discussion the pair of sete nearest the anal ring is called 
the cephalic pair of sete, the other pair then would be the caudal pair of sete. 
