21 



numljer of collections, incliuliug under this head each object oi- lot of objects 

 specially nnmbered and separately eutei'ed on our notes or in the accessions' 

 catalogue of the Station, is^thus nearly 12,000. Besides these mention should 

 be made of about 400 microscopical slides of serial sections of oli^ocha'te 

 worms made for Professor Smith in the course of liis studies of that f^Toup, 



LIST OF COLLECTIONS, 



Shallow-water collections with Birgre net 1 232 



(Qualitative poUections with surface net 

 ijuantitativf (•(illcctions with plankton apparatus 



l'riir(iy,(ja and IxotilV ra, collections 



N'erines, collections 



Crustacea, collections 



Arachnida, collections 



Insocta iliijuid collections) 



i iisfcta I pinned specimens i 



.Mcillusca, collections 



Fislies 



Amphibia 



Kcptilia 



Food collections 



592 



999 



543 



490 



167 



235 



2.245 



5,500 



388 



196 



59 



15 



434 



ENTOMOLOGICAL STUDIES. 



It has been thus far the primary object of the entomological studies made 

 by Mr. Hart to make us fully acquainted with each species in all its stages 

 as a preliminary to investigations along other lines. To this end extensive 

 search has been made of all varieties of situation in the waters of the Station 

 field, the species at each location being listed at each visit and collections 

 being also made. The regular typical localities represented by the substa- 

 tions have been further searched at regular intervals for two j^ears. About 

 five hundred lists and illustrative collections have thus been accumulated. 

 The biological observations and breeding-cage experiments made during this 

 time are recorded on some seven hundred note slips. 



The Hymenoptera and a large pai't of the Diptei'a and Lepidoptera have 

 been workea up, and reported upon in a paper on the entomology of the Illi- 

 nois River and adjacent waters, published as Article VI. of Volume IV. of the 

 Bulletin of the State Laboratory of Natural History. Since this publication 

 much additional information concerning these groups has been acquired. 

 Careful studies have been made on some of the smaller Diptera, on the 

 water-beetles, and upon the Neuroptera, Thysanura, and Hydrachnida^. 

 The dragon-tly collections have been determined by Mr. J. ('. Needham. 

 formerly Instructor at Knox College, and by Mr. C. C. Adams, an assistant 

 in the State Laboratory. 



These entomological collections represent some 3o0 species of insects. Every 

 effort has been made to identify, by breeding, eggs, larva', and pupje of 

 insects aquatic in any stage. About 27n hitherto undescribed forms have 

 thus been oljtained and immature stages of about 22.1 species have been 

 aecvirsitely identitied. 



