PROCEEDINGS OF THE NATIONAL. MUSEUM 



VOL. 79 



extremity. The spicules are unequal, 1.1 millimeters and 410fi long, 

 respectively. Accessory piece present. 



Female.— 22>.c> millimeters long by 438/x wide. The ala is 4.81 milli- 

 meters long. The vulva is distinctly visible and is sitiiated anterior 

 to the middle of the body, 10.58 millimeters from the head end. 

 The ovejector is 324ju, long and claviform. The nerve ring sur- 

 rounds the esophagus at a point 394/i, from the tip of the head. 

 The pharynx is 72/x long; the esophagus 3.28 millimeters long. The 

 tail is 148/x long. Eggs are 37 to 42.5/a long by 25.5 to 27ju, wide. 



Host. — Cci\ trocercus urophasianus. 



Location. — Gizzard. 



Distributio7i. — United States (Moon Creek, Mont.) 



Type specimens.— \J. S. N. M. No. 29766 ; paratypes No. 29767. 



2 



FiGUKBS 1-3. HABRONEMA UROPHASIANA. MALE. 1, HEAD, LATERAL VIBTW ; 2, TAIL 



VKNTRAL VIEW ; 3, HEAD, DORSAL VIEW. ORIGINAL 



This species differs from H. colaptcs in the number and position 

 of the caudal papillae of the male, in the position and extent of the 

 lateral ala, and in the head structure ; from H. uncininenis by having 

 cervical papillae, and by having shorter spicules ; from H. pileata by 

 being larger in size, in the presence of cervical papillae, and by having 

 armed lateral lips; from H. longispicula by having shorter spicules. 



KEY TO NORTH AMERICAN SPECIES OF HABRONEMA IN BIRDS 



1. One lateral ala present 2 



Two lateral aUe present 1 4 



2. Lateral lips unarmed; male more than 14 millimeters long 3 



Lateral lips armed ; male less than 14 millimeters long pileata 



3. Left spicule 2.4 to 3.3 millimeters long ; cervical papillse not observed 



unciuipenis 

 Left spicule 1.1 millimeters long; cervical papillae present. 



urophasiana, new species 



4. Lateral alie unequal; margin crenulated incerta 



Lateral alse equal; left spicule 3.24 millimeters long longispicula 



