NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



167 



flattened in the posterior half (fig. 214). A chitinous lamella ex- 

 tends along the entire sjDicule and the posterior half of the spicule 

 is scalloped along its median border to form a ])ectinate edge. The 

 chitinous lamellae of the posterior half of the 

 spicules are bent around to form a tubular struc- 

 ture. The paired accessory structures are 50 to 

 52 (i long, slightly recurved at their distal ex- 

 tremity and presenting three or four teeth on the 

 convexity of the cur\e. 



Female 25 to 35 mm. long and 170 /x thick. The 



Fig. 213. — Synthetocau- 

 lus eufescens. pos- 

 terior extremity of 

 MALE. X 100. After 

 Railliet, 1893. 



IG. 214. — Syntiietocau- 

 LUS rufescens. Spic- 

 ULE.S. Enlarged. After 

 Curtice, 1890. 



I'lG. 215.— S'i'NTHETO- 



caulus rufescen.s. 

 posterior ex- 

 tremity of female. 

 Enlarged. After 

 Curtice, 1890. 



tail is subcorneal and ends in a blunt point (fig. 215). The anus is 80 

 IX from the tip of the tail. The vulva is just anterior of tlie anus and 

 is 100 fx from the tip of the tail. The vagina proceeds anteriorly from 

 the vulva and divides to form the convergent uteri. The eggs are 

 ellipsoidal, 75 to 120 fi long a.nd 40 to 85 [x thick, with no trace of 

 .segmentation when oviposited. 



Host. — Orycfolagus cu.nicalus {Lepus cnnlculus) . (Commonly in 

 ungulates.) 



Location. — Bronchioles and pulmonary parenchyma, 



L ocality. — Europe. 



As noted in comment on the foregoing species, I have followed 

 Neveu-Lemaire in accepting records of lung worm from Lepus cuni- 

 culus as Syri. rufescens. 



