CONTENTS OF VOLUME XIII. 



PAGE 



Holland, W. J. — The Development of Entomology in North America 1 



DuPoRTE, E. M. — The Muscular System of Gryllus assimilis Fab. 



(permsylvanicus Burm.) 16 



Mann, Wm. M. — Aunt Guests from Fiji and the British Solomon Islands. ... 60 



Smith, R. C. — The Process of Hatching in Corydalis comuta L 70 



Hayes, W. P., and McColloch, J. W. — Some Observations on the Genitalia 



of Lachnosterna 75 



Ball, E. D. — A Review of the Species of the Genus Gypona occurring in 



North America north of Mexico (Hymoptera) 83 



Herrick, Glenn W. — The Winter of 1918-19 and the Activities of Insects, 



with Special Reference to the Clover Leaf Weevil (Hypera punctata Fab.). 101 

 Metcalf, Z. P., and Osborn, Herbert — Some Observations on Insects of 



the Between-tide Zone of the North Carolina Coast 108 



Spooner, C. S. — A. Note on the Mouth Parts of the Aradidae 121 



Metcalf, C. L. — Minutes of the Annual Meeting , 123 



Entomology in the U. S. National Museum 131 



Symposium on "The Life Cycle in Insects" — 



1. Folsom, J. W. — Apterygota 133 



2. Walker, E. M.— The Orthopteroid Orders 137. 



3. Ball, E. D. — Hemiptera (excluding Aphids and Coccids) 142 



4. Patch, "Edith M. — Aphids and Coccids 156 



5. Fracker, S. B. — Lepidoptera 167 



6. Chapman, Royal N. — Coleoptera (including the Strepsiptera) 174 



7. Metcalf, C. L.— Diptera 180 



8. Cockerell, T. D. A.— Hymenoptera 190 



9. Forbes, S. A. — General Discussion 193 



Seamans, Howard L. — The External Anatomy of Anthomyia radicum Linn. . 201 

 Hickernell, L. M. — The Digestive System of the Periodical Cicada, 



Tibicen Septendecim Linn 223 



Alexander, Charles P. — New or Little-known Crane-Flies from Formosa 



(Tipulidae, Diptera) 249 



Chamberlin, Ralph V. — The Myriopod Fauna of the Bermuda Islands, with 



Notes on Variation in Scutigera 271 



Melander, a. L. — Review of the Nearctic Tetanoceridae 305 



DoziER, Herbert L. — An Ecological Study of Hammock and Piney Woods 



Insects in Florida 325 



Ewing, H. E. — The Genus Trombicula Berlese, in America and the Orient. . . 381 

 Peterson, Alvah — Some Studies on the Influence of Environmental Factors 



on the Hatching of the Eggs of Aphis Avenae Fabricius and Aphis Pomi 



DcGeer 391 



Alexander, Charles P. — A New Sub-family of Tanyderid Flies (Diptera) . . . 402 

 Bezzi, M. — The Correct Name for the Dipterous Genus Dicrania 408 



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