1873.] 279 [Hagen. 
prove their agreement with the type of Mr. Walsh in my collection, 
and with his descriptions. Perhaps it is not superfluous to state that 
Psocus perplexus Walsh is different from this species. The speci- 
mens correspond with Harris’ description in the Corresp., p. 328, 
and the dates given are Sept. 20, 1836, and Sept. 6, 1837. Of the 
last Harris says, — ‘‘On fences, nidificating in cracks; young, and ac- 
tive pupz all feeding on the wood together. ” 
There are two small pieces of wood in the collection with eggs, 
one on the pin of the female taken Sept. 6, 1837, and the other, to- 
gether with the fore wing of a @, labelled Sept. 6, and the note by 
Dr. Harris, “ ¢ laying eggs.”” These egg cases are very extraordi- 
nary; they are placed in a small cluster about one-sixth in. long by 
one-half in. broad, of perhaps thirty, generally four in a row, close to- 
gether, like the cells of a honey-comb, and are composed of a gray ex- 
cretion resembling very fine gray sand. Each case has the form of a 
somewhat compressed cylinder, the greatest diameter being one-sixtieth 
of an inch, the height being the same. The top of the cylinder has a 
little ledge inside to prevent the cover, which is united to the cylinder 
by a hinge, from falling in. Some of the cases contain a dark, metallic 
colored, iridescent shell, the others being empty. The whole ar- 
rangement is entirely different from any thing described or known to 
me in the case of European species of Psocus. It seems difficult to 
understand how the abdomen of the female can contain so many 
eggs, for these were apparently laid together; but the statement of so 
distinguished an observer as Dr. Harris, —“ female laying eggs,” I 
think must be accepted until it is proved that he was in error. Re- 
lated species are known to lay a small number of eggs on leaves, | 
which they cover with a kind of web; while Harris’ eggs and cases 
appear to be hymenopterous or hemipterous, and, were it not for his 
statement, I should have believed that the Psocus was merely feed- 
ing on another’s eggs. It is surprising that Harris does not mention 
the eggs in his description of the species. (Correspondence, loc. 
cit.) . 
4. Psocus striatus Walker. Hag. Syn., 11, 9. 
No. 129. Psocus frontalis Harr. Mss. Cambridge, on fence north 
of Mr. Newell’s garden, in the college grounds, Sept. 1 and 9, 1837. 
There are seven specimens in the collection, two ¢, four 2, and a 
variety, of which only a few fragments remain. The species, fully de- 
scribed in Harris’ Corresp., p. 330, is certainly striatus Walker, but 
concerning the variety, which is not rare here,I have still some 
