200 NEW YORK STATE MUSEUM 



Aquatic Insects of New York State. N. Y. State Mus. Bui. 68. 

 1903. p.199-517, 52 pi. (3 col.) by James G. Needham Ph.D., 

 professor of biology, Lake Forest Univ.; A. D. MacGillivray 

 Ph.D., instructor in entomology, O. A. Johannsen M.S., instruc- 

 tor in civil engineering, both of Cornell Univ. ; and K. C. Davis 

 Ph.D., professor of horticulture, West Virginia Univ. 

 Issued Sep. 28, 1903. 



Contents 



PAGE 



Preface 199 



Part 1 Station Work of the 

 Summer of 1901. J. G. Need- 

 ham 200 



Part 2 Food of Brook Trout in 

 Bone Pond. J. G. Needham . . 204 



Part 3 Life Histories of Odo- 

 nata suborder Zygoptera. 

 J. G. Needham 218 



Part 4 Some New Life Histo- 

 ries of Diptera. J. G. Need- 

 ham 279 



PAGE 



Part 5 Aquatic Chrysoinelidae 

 and a Table of the Families 

 of Coleopterous Larvae. A. D. 



MacGillivkay 288 



Part G Aquatic Nematocerous 



Diptera. O. A. Johannsen. . . 328 

 Part 7 Sialididae of North and 

 South America. K. C. Davis. 442 



Explanation of plates 487 



List of text figures 499 



Plates 1-52 face 499 



Index 501 



Sialididae of North and South America by K. C. Davis. Reprint 

 from N. Y. State Mus. Bui. ()S. 1903. p.441-87 

 Issued Sep. 30, 1903. 

 A systematic and biologic account of this group. 



Two Tree Pests. Country Gentleman, Oct. 1, 1903, 08 :852 43 



Pear psylla, Psylla pyricola Forst. probably weakened the pear 

 trees at Hartley Hall Pa., so that they were attacked by the fruit tree bark 

 beetle, Scolytus rugulosus Ratz. Destruction of the infested trees 

 by fire is advisable. The maple is probably infested bySesia ace mi 

 Clem. Preventive measures are indicated. 



Chinese Lady Bugs. Country Gentleman, Oct. 8, 1903, 68 :871 18 



Records establishment and breeding ofChilocorus similis Rossi 

 at Kinderhook N. Y. 



INSECT EXCHANGE 



The state collection of insects contains large numbers of many 

 local, and in some cases somewhat rare forms. This, in connec- 

 tion with the fact that many species are not represented, and 

 specially in view of the economic importance of introduced insects, 

 led us to inaugurate a system of exchanges the past summer. 

 Those offered for exchange are, in every case, only such as can be 



