318 
Stronyylids of Horse 
In the female the distance of the vulva from the posterior extremity is 
0-6-07 mm. The eggs measure 0-08-0-09 mm. x 0-04-0-05 mm. 
The bursa of the male has a long dorsal lobe; the dermal collar completely 
surrounds the genital cone, but is better developed on the anterior or ventral 
surface. 
6. Triodontophorus intermedius Sweet, 1909. 
This species was found on several occasions, both in horses dissected in 
Lahore and among material sent from Sargodha by Capt. Stewart. 
T. intermedius evidently has a world-wide distribution, being now known 
from Europe (Boulenger, 1916), Asia, E. Africa (Boulenger, 1920), W. Africa 
(Yorke and Macfie, 1902 b), N. America (Ransom and Hadwen, 1918) and 
Australia (Sweet, 1909). 
Fig. 1. Triodontophorus minor Looss. Lateral view of anterior extremity, x 200. 
Among the specimens observed by me in Lahore were two in which the 
teeth of the mouth-capsule were without denticulations, having the margins 
quite smooth as in normal specimens of T. brevicauda and T. minor. As men¬ 
tioned above, this character is therefore one of no great systematic importance. 
7 . Triodontophorus brevicauda Boulenger, 1916. 
T. brevicauda was obtained on one occasion only, from a horse dissected at 
the Punjab Veterinary College. Originally discovered in England (Boulenger, 
1916) the species has since been recorded from N. America (Ransom and 
Hadwen, 1918), it obviously has a wide distribution. 
