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XII. Genus Diplotriaena Raill. el Henry 1909. 

 24. Diplotriaena sokolowi spec. nova. 



Host: blue martin {Halcijo7i senegaloides A. S m i t li). 



Occurence: ventral cavity. 



Description of tlie species: 



Parasite witli long, filiform, milk-white body, the cephalic 

 and caudal extremities of which are slightly narrowed and 

 uniformly rounded. No traces of longitudinal and trans- 

 verse striation of the cuticle are noticeable. The cephalic end 

 has neither lips, nor papillae. The circular mouth-opening 

 leads into an elongated, cylindrical oesophagus, to the upper 

 part of which from the sides are attached 2 chitinous triden- 

 tate formations characteristic for the genus Diplotriaena. Each 

 of them consists of a manubrium situated in the anterior part 

 of the trident, and 3 elongated cylindrical branches directed 

 backwards. The nerve-ring (in the female) is situated at a 

 distance of 0,3 mm. from the cephalic end. 



Male: 27 mm. long. 



The oesophagus reaches 3,82 mm. in length, the width at 

 the base being 0,085 mm. The initial part of the intestine is 

 rather wide, reaching 0,37 — 0,4 mm. 2 chitinous tridents arran- 

 ged on both sides of the upper part of the oesophagus are 

 adjacent by the anterior edge of their manubrium to the in- 

 terior layer of the cephalic part of the cuticle (unlike some 

 other species of Diplotriaena in which the trident is replaced 

 from the cephalic part of the parasite on a comparatively great 

 distance, as e. g. in Dip)lotriaena spermospisae (Linst. 1879)). 

 The length of the trident is 0,17 mm., length of manubrium 

 separately reaches 0,05 mm. The separate branches of the 

 trident are of unequal size: in the male specimen investigated 

 by me the lateral branch of the left trident was longer than 

 the other two branches whilst in the right trident both late- 

 ral branches were longer than the middle one. 



The posterior part of the body of the male is somewhat 

 blunt and rounded. From the number' of caudal papillae, the 

 preanal ones are absent; there are 2 pairs of postanal papillae 

 arranged symmetrically near the very caudal extremity and 

 lying in a transverse direction with respect to the body-axis: 

 one pair submedially, and the other — laterally. 



There are 2 spicula of unequal size and different form. 



