208 
very detailed examination, I am unable 
to separate from the European species. 
The slight differences of the venation, 
spoken of before, occur also among the 
North American specimens. The iden- 
tity of the species is made more sure by 
the fact that short-winged specimens are 
found in Europe and in North America, 
and that till now EH. unipunctatus is the 
only species of which short-winged spec- 
imens are known. I possess three spec- 
imens from Eastern Prussia, found to- 
gether with the long-winged specimens, 
and two from New York, which I 
received together with the types of Ps. 
signatus. 
Mr. Kolbe is inclined to doubt the 
existence of short-winged specimens 
(Monogr. deutsch. Psociden, p. 95), and 
therefore I may give here some more 
detailed information. The specimens 
agree exactly with the figure given by 
Westwood, Introd., -v. 2, f. 59, 
13, 14, 15- The only difference is the 
absence of ocelli according to West- 
wood’s statement, but I think that prob- 
ably he used a lens of low power. The 
ocelli are easily seen with the compound 
microscope; they do not stand upon a 
circular elevation as in the long-winged 
specimens, but upon the flat surface of 
the head. The cornea is very little con- 
vex, but sharply defined around its 
border, and shining; the anterior ocellus 
is smaller, and in one specimen the 
cornea is like a dull membrane. In 
another specimen this ocellus is deepened, 
but a small shining cornea is visible in 
the hole. The diameter of the two pos- 
terior ocelli is 0.04 mm.; the anterior 
is smaller. I saw Westwood’s type years 
no: 
PSTCHE, 
ago, but did not examine the  ocelli, 
which are very easily overlooked with- 
out the use of a compound microscope. 
The rudiments of the wings are small 
ovoid scales, attached to. the external 
margin of the mesothorax and to the 
metathorax with a very short stem, and 
not with a broad base as commonly in 
the nympha state. The scaies lie close 
to the thorax and are scarcely longer 
than the segment to which they belong ; 
they are opaque, chitinous, only the 
apical half thinner and somewhat trans- 
parent, yellow as the main color of the 
body of the insect, without veins, but 
with a darker middle stripe; the border 
around the scale somewhat thicker. 
The head of the short-winged speci- 
mens and the large eyes are similar to 
those of the normal form, excepting the 
want of the circular elevation bearing 
the ocelli. The antennae hairy but thin- 
ner. Size, body and legs as in the normal 
form. The genitals are not to be ob- 
served surely in the dry specimens, but 
seem to be similar to those of the normal 
form. - One is surely, three are probably 
male; one seems to be a female, and the 
eyes are more separated. I think the 
appearance of such specimens is by no 
means exceptional, as similar short- 
winged imagos are known to exist among 
the termitina and perlina. They are 
imagos with rudimentary wings. 
I remark that I had accepted for the 
species the name E£. aphidiodes Schrank, 
because it is doubtless sure, though 
Mueller’s name £. unipunctatus, the 
identification of which was first pointed 
out by myself, is only probably sure. 
