NO. 9 cuckler: nematode parasites 143 



Affinities : This species conforms to Thapar's diagnosis of the genus 

 Alaeuris except that no lateral alae are present, and there is a difference 

 in the character and disposition of the genital papillae. 



This species may be distinguished from A. alaeuris on the basis of 

 the prebulbar excretory pore, the number of cephalic papillae, the pe- 

 dunculated adcloacal papillae, and the difference in the length of the 

 spicule and accessoiy piece. 



The characters which distinguish this species from A. igiianae are: 

 its larger size, the distinct cephalic region, the distinct lips, the presence 

 of a common uterine stem, unstriated caudal alae, the character of the 

 genital papillae, and the longer spicule and accessory piece. 



This species may be distinguished from A. hirsutus by its smaller 

 size, longer relative length of esophagus, shorter spicule, longer accessory 

 piece, difference in number of cephalic papillae, the character of the 

 genital papillae, and the male tail which extends posterior to the border 

 of the caudal alae. 



The following characters distinguish this species from A. conspicua: 

 the absence of lateral alae, the size and shape of the spicule, the pre- 

 bulbar position of the excretory pore, the absence of a spike on the 

 male tail, and the character and number of genital papillae. 



Alaeuris longispicula, new species 

 (Plates 13 & 14, figs. 8-14) 



This species was less numerous in the collection than A. galapa- 

 ffensis. Approximately 8 per cent of the specimens from the heavily 

 infected host are of this species. 



These are medium-sized ox-yurids with relatively slender bodies. The 

 length of the male (fig. 12) is from 3.01 to 4.27 (average 3.58) mm., 

 and the greatest body width is from 0.25 to 0.32 mm. The body grad- 

 ually tapers from about mid-body to the extremities. The females (fig. 

 8) range in length from 5.28 to 7.77 (average 6.16) mm. and in maxi- 

 mum body width from 0.44 to 0.56 mm. 



The cuticula is thin and has striations about 0.010 mm. apart. 

 There are no lateral or cervical cuticular alae. Caudal alae are present 

 in the male. 



The cephalic region is distinct (fig. 10) and terminates anteriorly 

 in the rounded lips. The three lips are separated from one another by 

 distinct grooves. The lips bound a Y-shaped mouth (fig. 11) which 



