30 
Psyche 
[March - June 
ing greyish-brown as embryo develops. Micropyle sessile, flattened, 
chalk-white; a minute depression in center. Chorion, apparently 
smooth, but showing a minutely granulate texture at a magnification 
of 6oX giving the impression of finely frosted glass. At higher mag- 
nifications an irregular imprinted pattern visible, attributed to the 
pressure of follicular cells of ovary by Killington (1946). Minute 
elevations and tubercles of chorion reported for several other hemer- 
obiid genera by Killington (1936) lacking in B. fidelis. Size of a 
single unhatched egg: length — 0.7752 mm., greatest width — 0.3420 
mm. 
The eyes of the embryo become visible through the chorion after 
four days, while hatching takes place after about seven and one-half 
days of development (x = 7.6 zb 0.1 days, N = 70). As with 
other Neuroptera, emergence from the chorion is assisted by an egg- 
burster (figs. 5, 6) which forms a longitudinal ridge-like projection 
from the embryonic cuticle in the region of the clypeus. In a series 
of eggbursters derived from seven siblings which were studied in 
detail, the number of small teeth along the distal margin of the blade 
was found to vary between twenty-two and twenty-nine (x = 25.0 
zb 0.9). The two extremes are figured in figs. 5 and 6. 
First instar larva (figs. 1, 3) — Head capsule ellipsoid, prominent, 
as wide as widest part of body; of a uniform grey color dorsally, this 
interrupted medially by a Y-shaped eedysial cleavage line passing 
down to clypeal margins just medial to bases of jaws on either side; 
anterior, diverging arms of cleavage line cross connected by trans- 
verse area of pale cuticula at level of anterior tentorial pits delimit- 
ing a proximal frontal area and a distal clypeal area. Ocular area of 
head capsule antero-lateral, consisting of three, clear corneal swell- 
ings. Anterior two corneae each with one dark ommitidial element 
beneath ; three additional ommatidiae visible beneath posterior cornea. 
Latero-ventral surface of head capsule with usual pair of dark fuscous 
lines; the more dorsal, running between posterior tentorial pit and 
dorsal articulation of mandible, representing the subgenal sulcus, the 
more ventral, running from vicinity of posterior tentorial pit to maxil- 
lary component of jaw, representing cardo and stipes. Ventral surface 
of head capsule largely covered with shield-shaped mental region of 
labium. 
Antenna three segmented, short, reaching only to tip of extended 
jaws. Basal segment dark, fuscous; short, only slightly longer than 
wide. Second segment comprising most of length of antenna, about 
five times as long as first segment. Third segment short, peg-like, 
