June, 1903 .] 
Parasites of Certain Fulgoridae. 
445 
dogwood, and other shrubbery, upon which nymphs of O. septen- 
trioualis had been feeding. There were sometimes two and even 
three cocoons upon the same leaf (Plate 20, Fig. 3), and they 
usually were situated in the position that had been occupied by 
the host while living, as shown by the presence of the white 
waxy excretion with which the host surrounds itself on the leaf. 
The cocoon is very well hidden by this excretion, plus the 
remains of the host. It was evident that the O. septentrionalis 
nymphs were quite extensively parasitized. 
Feb. 18, 1903 — Examination of the above mentioned cocoons, 
(they having been kept in the laboratory during the winter), 
revealed six containing mature insects, all females (Plate 20, 
Fig. 6); one containing a pupa (Plate 20, Fig. 5); and in two 
cocoons they were still in the larval stage (Plate 20, Fig. 4). 
From this, inference is made that when remaining in natural 
situation among the fallen leaves during the winter, the larvae 
wait till the following spring before transforming to pupae, 
and that the adults would escape from the cocoons in the latter 
part of spring, or early summer. 
All six adults and the one pupa were females. The adults 
were quite active when liberated from the cocoons, and it is pro- 
bable that they would have soon liberated themselves. It was 
interesting to watch them rub their legs together, and rub them 
upon various parts of the body, to remove any fragments of 
exuvia or dust particles that might be present. It was particu- 
larly interesting to see the way they would clean the antennae by 
drawing them through the antennal cleaners or combs situated on 
the fore legs (Plate 20, Fig. 7 a). This structure consists of a 
curved row of closely set bristles, on the inner edge, at base of 
first segment of the tarsus. There is a large curved spine near 
the distal end of the tibia (Plate 20, Fig. 7/;). When the leg 
is bent at this joint (Plate 20, Fig. 8), this spine is brought into 
opposition with the antennal comb in such manner as to hold the 
antenna against the comb whilst being drawn through. By 
moistening the antennae, the insect was made to repeat this per- 
formance several times. 
II. Labeo tvphlocyb^e Ashm. 
Bull. 45, U. S. National Museum, p. 89, 1893. 
In examining the same lot of cocoons from which D. Ormenidis 
was obtained, several specimens of this form were found : five 
adults, and one pupa ; all males (Plate 21, Figs. 1,2). 
The cocoons from which these were taken were slightly smaller 
than the others. Otherwise they were similar, and the larvae, 
also, it may be inferred, must have had similar habits ; living in 
the same manner on the same species of host, and at the same 
time, and forming the same kind of a cocoon. 
