NEMATODE PARASITES OP BIRDS 211 



KEY TO SUBFAMILIES OF ACUARIIDAB 



1. Cephalic ornamentation consisting of cordons, epaulets or other homologous 

 structures; mouth with 2 simple lateral lips; usually 4 or 5 pairs of preanal 



papillae Acuariinae, p. 211. 



Cephalic ornamentations consisting of appendices or festoons; mouth with 

 2, 4 or 6 lips; preanal papillae variable in number, sometime"' very 

 numerous Schistorophinae, p. 284. 



Subfamily Acuariinae Railliet, Henry and Sisoff, 1912 



Subfamily diagnosis. — Acuariidae (p. 210) : Nematodes with cor- 

 dons, epaulets, or other homologous ornaments at the anterior 

 extremity. Mouth with 2 simple lateral lips, followed by a vestibule 

 or pharynx with its wall usually transversely striated, and an 

 esophagus differentiated into 2 parts. Male with caudal extremity 

 provided with 2 lateral alae sustained usually by 4 to 6 pairs of 

 preanal and by a variable number of postanal papillae. Eggs ellip- 

 soidal and with thick shell, embryonated at time of oviposition. 



Parasitic in dicrestn'e tract of birds. 



Type-genus. — Acuaria Bremser, 1811. 



KEY TO GENERA OF ACUARIINAE 



1. Ornamentation of the anterior end in the form of cordons extending post- 



teriorly from the head along the cervical region, usually in the sub- 

 median fields (Acuarui, s.l., p. 212) 2. 



Ornamentation of a nature different from the above, confined to cephalic 

 region 8. 



2. Cordons not recurrent, not anastomosing 3. 



Cordons recurrent or anastomosing, or both 4. 



3. Both spicules thick and only slightly unequal; 6 to 8 pairs of postanal 



papillae Acuaria, p. 216. 



Spicules very dissimilar and very unequal; 5 to 7 pairs of postanal 

 papillae Cheilospirura, p. 'J20. 



4. Cordons not recurrent, but anastomosing 5. 



Cordons recurrent, anastomosing or separate C. 



5. Cuticle raised in front of postcervical papillae to form a large collar or 



Sheath; cordons anastomose on the free posterior border of the collar. 



Chevreuxia, p. 231. 

 Xo such collar or sheath present Echinuria, p. 244. 



6. Cordons recurrent hut not anastomosing Dispharynx. p. 237. 



Cordons recurrent and anastomosing— 7. 



7. CprdoilS form a loop directly after their origin on the head; cordons not 



tl.it against body hut applied to margin of plates or alae; lateral alae 



present on body Cosmocephalus, p. 233. 



Cordons with loops lacking at their anterior ends; cordons applied directly 

 to the body; no lateral alae Synhimantus, p. 272. 



8. Cephalic ornamentation consists of a narrow denticulated collar which is 



the margin of a depression surrounding the head at the base of the lips; 

 cervical papillae large and crescent-shaped, with numerous teeth. 



Streptocara, p. 2G4. 



