REPOET OF ASSISTANT SECRETARY. 



19 



The following table shows the estimated numbers of the pinned and 

 mounted si^ecimens in the collection : 



Hymenoptera 



Coleoi)tera 



Lepidojitera ,. 



Diptera 



Ileiniptera 



Ortlioptera 



Nenroi)tera 



Araclin ida and Myriapoda 



I iKsoct architecture 



Miscellaneous (not yet arrauj;od) 

 Galls and gall insects 



Total 



Boxes. 



(if) 

 127 



21 

 5i> 

 64 

 14 



2 

 16 



28 



:5i 



766 



Specimens. 



24, 796 



4:},f)i:5 



17, 0'J.S 



.'J, 64(J 



8, 8(i2 



6,1)(« 



868 



42.^> 



1,080 



i,(;io 



4, V>2 



115, 05:3 



Species. 



2, 6.50 



(5, 558 



2, .'508 



699 



1,184 



5(i0 



169 



110 



178 



178 



7;i4 



15, 328 



In addition to these pinned specimens, the collection contains some 

 nineteen large boxes of alcoholic material, chiefly of the adolescent 

 states of insects, comprising some 2,850 vials, in many cases several 

 species being contained in a single vial. The collection contains a large 

 number of uudescribed species in all orders. 



The early states of the minuter insects are mounted in balsam on slides 

 (I by 3 inches), of which the collection contains upward of 3,000, most 

 of the slides holding the contents of three cover glasses. 



The mounted material is contained for the most part in double-folding 

 boxes in book form, about 32 by 22 by 8 centimeters, lined on both sides 

 with cork and paper. 



A certain proportion of the boxes are less than 7 centimeters wide., and 

 are lined only on one side. There are also two cabinets, one with sixteen 

 large, glass-covered drawers, and another (now at Dr. Riley's residence) 

 of sixty glass covered drawers. The specimens are all duly classified 

 and hibeled, and in excellent order and preservation. The labels in- 

 clude notes as to locality and food habit, and are also in many cases 

 numbered to correspond to detailed notes as to adolescent states and 

 habits. 



The collection was begun twenty-five years ago, and represents Dr. 

 Riley's continuous collectings since, including his own types and many of 

 other authors received in exchange. It embraces few exotic species, and 

 is more particularly rich in biological material, containing more blown 

 and alcoholic larvae and pupje in connection with their imagos than per- 

 haps any other collection of Korth American insects. Including the 

 unarranged and alcoholic material not coniuN'ted with the pinned speci- 

 mens, there are over 20,000 species in the collection. 



The curator has continued his work in re-arranging and perfecting 

 difierent families in several orders, particularly among the micro lepi- 

 doptera. 



