444 
The Ohio Naturalist. 
[Vol. Ill, No. 8, 
OBSERVATIONS ON HYMENOPTEROUS PARASITES 
OF CERTAIN FULGORID/E.* 
Otto H. Swezey. 
In connection with life history studies of Fulgoridae, the fol- 
lowing species were reared from nymphs of Ormenis septentrion- 
alis Spin., and Liburnia lutulenta Van D. The first two as 
primary parasites, and the third as a secondary parasite on 
Ormenis septentrionalis ; the fourth and fifth as primary parasites 
on Liburnia lutulenta. 
For the accurate identification of the first three species, I am 
indebted to Dr. William H. Ashmead, Assistant Curator, 
Department of Insects, U. S. National Museum, Washington, 
D. C. The third species mentioned, proved to be a new species, 
and was given the name below. 
I. Dryinus ormenidis Ashm. 
Entomological News, XIV, p. 192, 1903. 
In August, 1902, while collecting the larvae and nymphs of 
Ormenis septentrionalis Spin. (Ohio Naturalist, Jan. 1903, 
p. 355.) some specimens were found to be infested with parasitic 
larvae, which on being reared, proved to be Dryinus ormenidis 
Ashm. 
The larva lives in a “ felt-like sack protruding from a spiracle” 
(Ashmead) at the base of the abdomen of its host, and as the 
latter matures, the parasite is partially covered by the wing pads 
(Plate 20, P'ig. 1). The full grown larva is 4-5 mm. in length, 
is footless, and has rudimentary mandibulate mouth parts (Plate 
20, Fig. 4.). It finally causes the death of the host; then it 
escapes from its sack, by the latter splitting very neatly in half, 
and it forms a cocoon beneath the remains of the host, on the 
surface of the leaf upon which the host has been feeding (Plate 
20, Fig. 3). A cocoon was made in this manner, by a specimen 
in a breeding cage, Aug. 5. 
The cocoon is oval or oblong-oval, 7 mm. x 5mm.; it is very 
wdiite and semi-transparent, and of a low convex form, having 
the central portion which is occupied by the insect, a little more 
elevated (Plate 20, P'ig. 2). This figure isof a cocoon, enlarged, 
showing the flat expanded portion, and the central part surmount- 
ed by the remains of the host, on the right side of which is shown 
the sack in which the parasite lived. 
From August 5 to August 15, quite a number of leaves, having 
cocoons of this parasite, were collected from climbing bittersweet, 
Contributions from the Department of Zoology and Entomology, Ohio State Univer- 
sity. No. 13. 
