NEUROPTERA. — PSOCID. : 19 
Iconography; and more recently Curtis, and especially Stephens, have 
described many additional species, proposing various divisions founded 
upon the variation of the nerves of the wings. It appears to me, 
however, that a more minute structural investigation of these in- 
sects is required, as I am inclined to think they vary materially in 
the sexes. In the month of July, I have observed on the trunks 
of apple trees a species which I believe to be P. 4-maculatus Laér. ; 
the smaller specimens, having the wings veined as in fig. 59. 8., and 
the tarsi, distinctly 3-jointed (jig. 59. 9.), were produced from pup 
(fig. 59.10), which had four long wing-covers, 2-jointed tarsi (fig. 
59. 12.), and 13-jointed antenne (fig. 59. 11.); the females, as I pre- 
sume them to be of the same species (fig. 59. 1.), were larger, with 
the veins differently arranged, and with 2-jointed tarsi (jig. 59.7.). I 
found in company with these insects a number of specimens in the 
state represented in fig. 59.13., and which, from their large size and 
the markings of the head, destitute of ocelli, 1 presume are the pupe 
of the females, although the small size of the rudimental wing-cases, 
and of the meso- and meta-thorax (fig. 59. 14. thoracic segments la- 
terally), together with the 3-jointed tarsi (fig. 59.15.), might lead to 
the opinion that these individuals will never acquire wings ; the struc- 
ture of their mouths also agrees with that of the females. If my sup- 
position, as tothe specific identity of all these individuals, be correct, 
the genus Ceecilius of Curtis must be rejected, being founded upon a 
sexual character. 
M. V. Audouin has communicated to me an observation made by 
him, in which a female winged Psocus was seen to weave a web over 
its eggs, which it had deposited in the impressed parts of leaves formed 
by the veins of the leaf. Likewise that, in another species, the eggs, 
eight in number, were arranged on a leaf in an irregular circle, with 
the tips ail pointing to the centre of the circle. In the month of 
August, I have found amongst old papers specimens of a minute 
species in the state agreeing with fig.59.13., having four minute 
rudimental wing-cases, but with 2-jointed tarsi. These insects I 
presume to be fully developed females of the insufficiently’charac- 
terised Atropos fatidicum ; with them I found many specimens still 
smaller, with a more slender body, and with only two rather short 
rudimental wing-cases (fig. 59. 18.), as wellas a single specimen (jig. 
59.16.) agreeing with the latter, except that the two wings were 
larger ; the nerves more distinct ; the tarsi only 2-jointed (fig. 59.17.) ; 
c 2 
