NO. 9 cuckler: nematode parasites 157 



SPECIFIC DIAGNOSIS OF PARALAEURIS DOROCHILA 



Characters of the genus. Males from 1.11 to 1.80 mm. in length by 

 0.08 to 0.14 mm. in width; females from 2.17 to 3.80 mm. in length by 

 0.16 to 0.24 mm. in width. Thick cuticula, striations about 0.008 mm. 

 apart. No cervical or lateral alae; caudal alae in male. Cephalic region 

 indistinct; three simple lips, slightly lobed ; each lip with two papillae; 

 each ventrolateral lip with a short, anteriorly directed, pointed process. 

 Esophagus 0.31 mm. long, about one fourth body length, in male and 

 0.37 mm., about one seventh body length, in female. Nerve ring 0.108 

 mm. in the male and 0.116 mm. in female from anterior end. Excretory 

 pore postbulbar, 0.40 mm. in male and 0.52 mm. in female from an- 

 terior end. 



Male: Alate tail 0.20 mm. long, about one seventh body length. 

 Single short, pointed spicule, 0.065 mm. in length. V-shaped accessory 

 piece 0.018 mm. long. Four pairs of pedunculated genital papillae. Three 

 pairs precloacal, one pair caudal in position. Two pairs arise from com- 

 mon stalks, forming double papillae; third pair on long peduncles, lateral 

 and dorsal to double papillae; fourth pair on long ray-like peduncles 

 supporting caudal alae. Wide caudal alae extend slightly posterior to 

 caudal papillae. 



Female: Long finely pointed tail 0.723 mm. in length, about one 

 fourth body length. Vulva anterior to mid-body, averaging 1.16 mm. 

 from anterior end. Vagina about 0.37 mm. long, and ovejector about 

 0.035 mm. in length. Eggs average 0.042 mm. by 0.092 mm. ; segmented 

 in utero. 



The species name refers to the cuticular projections on the lips. 



Summary 



1. Five species of nematode parasites are reported from the Gala- 

 pagos land iguana, Conolophus subcristatus Gray. Apparently, these are 

 the first nematode parasites reported from this iguana. 



2. Of the five species of parasites reported, four are assigned to 

 the genus Alaeuris Thapar, 1925. Each of these species is new. The 

 new species described are: A. galapagensis, A. longispicula, A. labicula, 

 and A. conolophi. 



3. The other species reported is assigned to a new genus. The 

 name Paralaeuris is proposed for this genus. A new species, P. dorochila, 

 is described in this genus. 



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