June, 1903.] Parasites of Certain Fulgoridae. 445 



dogwood, and other shrubbery, upon which nymphs of O. septen- 

 trionaHs 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, 

 (the}^ 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, P'ig. 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. ja). This structure consists of a 

 curved row of closel}' 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, F'ig. 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.^ Ashm. 

 Bull. 45. r. 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, P'igs. 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. 



