NEMATODE PARASITES OF BIRDS 311 



Life history. — Unknown; probably involves intermediate stages 

 in insects. 



Distribution. — Europe (Germany (Koenigsburg) ). 



Ortlepp (1922) states that he has studied specimens of this species 

 from Pavo cristatus and that the species belongs in the genus Cyrnea. 

 The detailed description which he says he will give at a later date 

 has not yet appeared. The lip structure and the position of the 

 vulva of the nematode is not compatible with Physaloptera but the 

 above description is inadequate for its assignment to another genus. 

 Ortlepp's redescription and transfer of this species to Cyrnea ap- 

 peared after the above had been sent to press. See Addenda, p. 390. 



Family THELAZIIDAE Railliet, 1916a 



Synonym. — Thelaziidae Skrjabin, 19166. Railliet's paper pro- 

 posing this new family appeared in March, 1916, and Skrjabin's 

 paper in October, 1916. 



Family diagnosis. — Spiruroidea (p. 162) : Mouth without lips but 

 provided with papillae; a short buccal cavity present. Male with 

 or without caudal alae; preanal papillae usually very numerous; 

 postanal less numerous. Spicules usually very unequal. Female 

 with tail generally blunt. Situation of vulva variable. Two uteri. 

 Oviparous, ovoviviparous or viviparous. 



Parasitic in orbital region of mammals or birds. 



Type genus. — Thelas'm Bosc, 1819. 



Railliet included in this family the genera Schistoropkus and 

 Serticeps, but Travassos subsequently removed them and put them 

 in the family Schistorophinae, under the family Acuariidae. The 

 present writer has followed this latter classification ; the above 

 diagnosis of the Thelaziidae is therefore an emendation of that of 

 Railliet. Railliet's assignment of the family to the Spiruroidea 

 is followed here rather than Travassos's assignment of it to the 

 Filarioidea. 



KEY TO GENEKA OF THELAZIIDAE 



1. Male with large caudal alae Ceratospira, p. 319. 



Male without caudal alae 2. 



2. Vulva in anterior part of body Thelazia, p. 311. 



Vulva in posterior part of body Oxyspirura, p. 321. 



Genus THELAZIA Bosc, 1819 



Synonym. — Thelazius Bosc, 1819. 



Generic diagnosis. — Thelaziidae (p. 311) : Mouth without lips. 

 followed by a buccal cavity, the anterior edge of which has 6 pro- 

 jecting lobes. Two lateral and 4 submedian cephalic papillae. Male 

 with caudal extremity obtuse, usually recurved, without lateral alae. 

 :;r,i2— 27— 22 



