PARASITIC ROUNDWORMS 



539 



« (i) Anterior region very slightly or not at all attenuated. Tir, white usu-illv 

 followed by a distinct dark ring ' ' ' 



Caudal end lobed; in feniale if not lobed then of uniform caliber with Ixxly or sliKhily en- 

 larged, but not set oflf by a distinct constriction. MiKnii> cn- 



9 (lo) Anterior region slightly attenuated, tip obliquely truncate- dark 

 ring very broad Paragordius Camerano iSg;. 



Caudal end trilobed in female and only bilobed in male. All males of Gordius also have the 

 caudal end bilobed. 



Montgomery rightly emphasized the absence of cloacal musculature in the male and the 

 exceedingly long cloaca in the female as most significant generic features to which the taudaJ 

 lobes were subordinate in value. For mere diagnostic purposes the latter are convenient. 



Only species in North America. . . Paragordiiis varius ''Leidy) 185 1. 



Males more slender and considerably longer than females; up to 350 mm. lonR. o 9 mm 

 wide; female up to 290 mm. long, 2 mm. wide. 



The long trilobed tail of the female, the long cylindrical caudal lobes in the male, the obliquely 

 truncated head, and the usually very dark-colored ring around the head make its identification 

 easy. 



Montgomery found the larva only in Achaeta abbreviala (Gryllus assimilis). Found by 

 Minnie E. Watson in the same host at Urbana, Illinois, and by H. G. May in the same host 

 and also in Nemobius Jasciatus at Douglas Lake, Michigan. 



From New England to New York, Virginia (and southward?; it is reported from (;uatemab): 

 also Kansas and CaUfornia. I have specimens from Lake Erie, Lake St. Clair, Lake 

 Michigan, and Nebraska. 



e 



Fig. 836. Paragordius varius. a, lateral aspect of head. X 25. (Originat) ft. vfnlr.il view of uil. 

 X 25. (Original.) c, dorsal view of tail (female). X 25. (After Stiles.) «/, surface view of cuticulm in 

 male and e, in female. Highly magnified. (After Montgomery.) 



10 (9) Anterior region not attenuated, tip usually rounded. 



Gordius lAwnwcns \-]S^ • ^^ 

 Caudal end bilobed in male; simple, not enlarged in female. 



11(22) Caudal end bilobed, spirally inroUed. . (Males of (TorJ;;/^) . . i: 



12 (13) Arcuate cuticular ridge anterior and lateral to cloacal p<irc. 



Gordius alasccnsis Montgomery kx)?. 

 Female not known; male 120 mm. lonp. slen- 

 der, cylindrical. Head roundi-tl. Cau<l.il lol>os 

 without hairs or spicules. .Aretiles irreRular. in- 

 terconnected. Color dark brown with darker 

 [Oj'^J neck ring. 



Fig 8?7. Gordius ulufcrnsis. CuticuUr arrolr*. 

 lateral and ventral views of tail. Magnifictl. l-Mtcr 

 Montgomer>'.) 



