ENTOMOLOGICAL NEWS 



AND 



PROCEEDINGS OF THE ENTOMOLOGICAL SECTION 



THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 



Vol,. XXVIII. 



JULY, 1917. 



No. 7. 



CONTENTS 



Kennedy — Notes on the Penes of Zy- 

 goptera ( Odonata ) No. 3 289 



de la Torre Bueno — Life History and 

 Habits of the Margined Water Stri- 

 der, Gerris marginatus Say (Hem., 

 Het.) 295 



Robertson — Feeding Habits of Adult 

 Chrysopidae ( Neur. ) 301 



Cockerell — Some Bees of the Genus 

 Psaenythia (Hyni.) 302 



Physiographic Divisions of the United 

 States 303 



Hess— Origin and Development of the 



Photogenic Organs of Photuris 



pennsylvanica DeGeer (Col.) 304 



Howard — An active Aiit-Killer( Arach., 



Solpugid.) 310 



Hebard — Notes on the Earwigs ( Der- 

 maptera) of North America north 



of the Mexican Boundary 311 



Johannsen — Some North American An- 



thorayiidae ( Dipt. ) 323 



Skinner — New Species of Lepidoptera 328 



Editorial — Insects and War 330 



Entomological Literature 332 



Obituary Notes 335 



Notes on the Penes of Zygoptera (Odonata). 



No. 3. The Penes in Neoneura and Related Genera. 



By Clarence Hamilton Kennedy, Cornell University, 



Ithaca, New York. 



(Plates XXI-XXIII.) 



In the first* of this series of articles was shown a series ot 

 penes in the genus Acanthagrion, whose divergent characters 

 showed but little generic cohesion, a series with such abrupt 

 changes in form from species to species that their characters 

 could not be used in defining generic limits though they were 

 exceptionally valuable in differentiating species. 



In the second paperf was shown a series of penes in the 

 Hawaiian genus Megalagrion, in which, though the genus in- 

 cluded forms of diverse venation, size and body structure, 

 the penes ran so close to each other in structure that the en- 

 tire series of over twenty could not be divided into groups and 



* Ent. News, xxvii, pp. 325-330, pi. XVIII, July, 1916. 

 t Ibid, xxviii, pp. 9-14, pis. II, III, Jan., 1917. 



289 



