23 
nevertheless carefully compared those papers, and checked off the 
types present. 
The papers on Bombycidz and Zygenide in the Proceedings of 
the Philadelphia Entomological Society for 1864, and in the Fourth 
Report of the Peabody Academy, 1872, were carefully compared, 
and after this had been done, the North American species newly 
arranged. Of the species described in the first paper, only two 
types are wanting, — Platanotia modesta and Cidemasia nitida. 
Of the species contained in the second paper, only five are want- 
ing, described from specimens belonging to other entomologists. 
Of his paper on the Lepidopterous Fauna of Labrador (Proc. Bost. 
Nat. Hist. Soc., 1866,) among the Diurna and Bombycide only 
three are wanting. 
The types of the Hymenopterous and Lepidopterous Insects col- 
lected by Prof. J. Orton for the Smithsonian Institution in South 
America (Rep. Peabody Acad., I.) are of course in the Museum of 
this institution; but of the insects collected in Pebas, Ecuador 
(Rep. IV., 1872), the types of the four described Lepidoptera are 
present. 
The Coleoptera from Labrador (Rep. IV., p. 92), all but twelve, 
are present. Of the types of the Synopsis of the Thysanura 
(Rep. V., p. 23), all the Texan species, and a number of the 
others, are present. They are about the only Thysanura in the 
collection. 
A comparative exhibition of the Insects of all parts of the globe 
would be for the Museum a feature equally interesting and in- 
structive, the more so as it has not been tried by any other 
Museum. At first I had no doubt that such an exhibition could 
be effected, at least to a large extent, with the material actually 
at hand, though the best first-class specimens had been used be- 
fore, especially in the unusually large systematic exhibition. Of 
course some preparatory work was needed, and was begun directly. 
But the work grew unexpectedly large and daily larger, as impor- 
tant groups and families had to be brought together and studied 
again. In fact, during the last five months this work occupied 
nearly the whole time of the Assistant. 
Finally, I decided to try first the exhibition for Europe, because 
its fauna is the most familiar one. After having filled two boxes 
with butterflies, — the large number of Argynnide is a prominent 
character of the European fauna, —the Coleoptera were begun 
