LIST OF CONTRIBUTORS. 



With reference to the several articles contributed by each. 



For Verbal Communications, Announcements, etc, see General Index. 



Barber, C. M. and T. D. A. Cockerell. A new Weasel 



from New Mexico 188 



Boyer, Charles S. New Species of Diatoms (Plate XXIV) 470 



Calvert, Philip P. Odonata (Dragonflies) from the Indian 

 Ocean, and from Kashmir, collected by Dr. W. L, 

 Abbott 141 



Cockerell, T. D. A. New and little4vUown Bees from Wash- 

 ington State .....*.. 50 



Conklin, Edwin G., Ph. D. Environmental and Sexual 

 Dimorphism in Crepidula (Plate XXI, XXII, 

 XXIII) 435 



Cope, Francis R. The Summer Birds of Susequehanna 



County, Pennsylvania ...... 76 



Coues, Dr. Elliott. Notes on Mr. Thomas Meehan's Paper 

 on the Plants of Lewis and Clark's Expedition across 

 the Continent, 1804-06 ...... 291 



Dall, William H. Synopsis of the Recent and Tertiary 



Psammobiidae of North America . . . .57 

 On the Genus Halia of Risso 190 



Fox, William J. Contributions to a Knowledge of the 

 Hymenoptera of Brazil, No. 4 — Thynninae and addi- 

 tions .......... 72 



Contributions to a Knowledge of the Hymenoptera of 

 Brazil, No. 5. — Vespida? ...... 445 



Hamilton, S. Harbert. The Occurrence of Marcasite in 



the Raritan Formation ...... 485 



Harshberger, John W., M. D. Botanical Observations on 

 the Mexican Flora, especially on the Flora of the Valley 

 of Mexico 372 



Hough, Garry de N., M. D. The Muscidse collected by 



Dr. A. Donaldson Smith in Somaliland . . . 165 



Goldsmith, Edward. Volcanic Rocks of Mesozoic Age in 



Pennsylvania (Plates II, III, IV, V) ... 90 



The Petrifaction of Fossil Bones ..... 98 



Von Ihering, H. Contributions to the Herpetology of Sao 



Paulo, Brazil.— I 101 



Johnson, Chas. W. Diptera collected by Dr. A. Donaldson 



Smith in Somaliland, Eastern Africa . . . .157 

 New Cretaceous Fossils from an Artesian Well-boring at 

 Mount Laurel, N. J 461 



,/ V v ^o 



