500 PROF. C. L. BOULENGER ON FILARIID 



FoUopsar leucocejyhalus ; in tlieir measurements they agree fairly 

 well with the worms described by v. Linstow (1891) as belonging 

 to this species. My material consisted of females only. 



Specific diagnosis. — ly^dotricena : Body long, filiform, tapering 

 close to the anterior and posterior extremities which are of 

 approximately the same thickness. Cuticle not transversely 

 ringed. 



Text-figure 8. 



Diploti-icena tricuspis (Fedtscli.). 

 Lateral view of anterioi' extremity of female, X 120. 

 (t'.oe.j anterior region of oesophagus ; nr., nerve-ring; p.oe., posterior region of 

 oesophagus; tr., trident; va., vagina; vu., vulva. 



Six head-papilhe ; the four submedian are very small and 

 inconspicuous. The oesophageal trident has a length of 0'15 mm. ; 

 its anterior stem is truncated. 



CEsojjhagus consisting of a short anterior region and a very 

 long posterior region. The nerve-ring surrounds the anterior 

 oesophagus about 0'25 mm. from the anterior extremit3^ 



Female 160-180 mm. long; the greatest breadth of the body is 

 about 0'6 mm. 



The narrow anterior region of the oesophagus has a length of 



