552 REPORT OF STATE GEOLOGIST. 



B. ORDER LONGIPENNES. 



LONG-WINGED SWIMMERS. 



a 1 . Covering of upper mandible of three distinct pieces ; a terminal hook, a lateral 

 piece, and a cere-like piece overhanging the nostrils. 



STERCORARIIDJ2. JAEGERS, ETC. IV 



a 2 . Covering of upper mandible of a single piece pierced by the nostrils. 



LARID^E. GULLS AND TERNS. V 



[Included in this order are the Rhynchopidae or Skimmers, the limits of whose range do 

 not reach this State. The above key is not intended to include them.] 



C. ORDER STEGAJSFOPODES. 



DARTERS, PELICANS, CORMORANTS. 



a 1 . Upper mandible hooked at tip. 



ft 1 . Tarsus moderate, much longer than hind toe with claw. 



c 1 . Bill shorter than middle toe, compressed; gular sack small. 



PHALACROCORACIDJE. CORMORANTS. VII 



c 2 . Bill much longer than middle toe, much flattened; gular sack very large. 



PELECANID^E. PELICANS. VIII 



6 2 . Tarsus very short, not longer than hind toe with claw ; wings and tail 

 excessively long, the latter deeply forked. 



FREGATHXE. MAN-O'-WAR BIRDS. IX 



a 2 . Upper manible not hooked at tip. Bill slender, nearly straight ; tail long, 

 feathers very broad ; neck very long and slender. 



ANHINGID^E. DARTERS. VI 



D. ORDER ANSERES. 



DUCKS, GEESE AND SWANS. 

 Characteristics the same as the order. ANATIDJE. DUCKS, ETC. X 



E. ORDER HERODIONES. 



HERONS, STORKS, IBISES, ETC. 



a 1 . Sides of upper mandible with a deep, narrow groove extending from the nos- 

 trils to the tip. 



ft 1 . Bill very broad, much flattened, and greatly widened toward the tip, only 



the end bent down. PLATALEID^E. SPOONBILLS. XI 



fe 2 . Bill slender, nearly round, gradually bent downward for nearly its whole 



length. IBIDIDJE. IBISES. XII 



a 2 . Sides of upper mandible without groove. 



c 1 . Middle toe nail with comb-like inner edge; claws narrow, arched, and 



sharp pointed. ARDEID^E. HERONS, ETC. XIV 



c 2 . Middle toe nail with comb-like edge; claws broad and flat, resting on 



a horny pad or shoe. CICONHDJE. STORKS, ETC. XIII 



