DIVISION OF INSECTS——ALDRICH. 373 
label with this number, and the word “ Type,” “Allotype,” or “ Para- 
type.” In the Division of Insects the record of these numbers is in 
the sixth volume, and includes 22,969 numbers. 
INVENTORY. 
In 1886 Riley estimated the collection which he transferred to the 
Museum at more than 115,000 specimens. In his report for 1894 he 
estimates that the collection contained 45,000 species of insects, repre- 
sented by 610,000 specimens. In 1901 Dyar announced by actual 
count 16,653 species and 129,789 specimens in the Lepidoptera. In 
1905 in a special report Schwarz estimated the Coleoptera at 30,000 
species. There appear to be no other estimates on file until June, 
1919, when an effort was made to get an inventory of all the orders. 
On account of the magnitude of the task and the shortage of workers 
in some orders it was necessary to make estimates rather than abso- 
lute counts in some cases; these, however, were made from examina- 
tion and are conservative. In summarizing below the results by 
orders, the items are reduced to two—the number of named species 
and the total number of specimens. Of these the former is by far the 
more significant, as a specimen may be anything from a duplicate 
housefly to a moth which a generous benefactor purchased for $100 
and presented to the Museum. In groups where single specimens are 
likely to have little value the figures have, however, been reduced to 
a very conservative basis—in scale insects, for instance, only speci- 
mens mounted on microscope slides are included. 
Summary of collection, June, 1919. 
Order. Rane spec Order Scones. speci 
Mhysanura oS sss. 2-2 oee 1100 ¥700)|, Orthoptera 222222222255 -22 22-2 2,556 25, 988 
Odlonat aes. Meee! LS cts 705 16,642) | Hemiptera. 3050.84) 13,876 | 1244, 637 
ESODLCE Asse cea Wesel ososes 173 | 1100,000 || Lepidoptera.............-.-.-. 30, 653 275, 920 
Ephemerida.......-.-----.--- Di ptera-weewe ee ee 10, 253 210, 880 
PlCCopiet avec esse tase ae Siphonaptera-....---- 1) chet 1130 1 432 
Cormodentiajs. ses -ce <2 see 647 14.721 Coleoptera-/s0.5. 2.2 132,500 | 1738, 000 
Mecopterans. sce. 522s: : Hymenoptera......-.---.---- 17,638 | 493, 757 
richopterassce ie -/5 aie = 2\s- Thysanoptera...---.--------- 200 750 
INGUBOREREAS Sc. sa ciaticis see ce Strepsiptera.......-.-.---.-.. 159 414 
Matlophara ses. see ise. se5cc 1125 11, 250 Ra eeu eealene GLE che 
Dermaptera RaALge seesiAs ha PL Ma ee 180 1, 098 Tobale. 22222222822. 22 98, 925 2, 125, 189 
1 Estimated. 
The collection is unique among those of the great museums in the 
large number of immature stages which it includes; this is a natural 
result of the immense amount of biological work on insects carried 
12573°—21——_25 
