PARASITIC ROUNDWORMS 



21 (i8) No conical spicules behind cloacal aperture; caudal lobes cylin- 

 ^^^^^^ Gordius pliilyccp/uilus Monigomcry iii()». 



For female of this spcdcs n.Msult ^o in tlii> key 

 Male up to 216 mm. Iomk, i mm. broad. The flattened 

 anterior end is characteristic, l.ut MontRomery fuund one 

 specimen apparently of G. densarrolalus with this feature and 

 could explain it only as a hybrid form. Canada. iVnnsvl- 

 vania, and Guatemala. ' 



Fig. 842. Gordius plalycephalus t 

 aspect. Magnified. (Aft 



^ , head and ui! in vcntr&I 

 ter Montgomery.) 



2 2 (11) Caudal end straight, not enlarged nor lobed. 



(Females of Gordius) . . 23 

 Compare 5 in key. 



2;^ (24) No elevated cuticular areoles on surface of body. 



Gordius villoti Rosa 1882. 

 For male and range of this species consult 14 in this key. 

 . Largest female 705 mm. long, 1.9 mm. broad. One variety {G. villoti diffifilis .Mont- 

 gomery) has cuticular areoles at the ends of the body only. The other varieties arc like the 

 males marked with hght spots or plain. Montgomery found some points of difference from 

 the European type, and the American form may prove on further study to be a sep.-irale 

 species. 



24 (23) Elevated cuticular areoles cover the entire surface of the body. 25 



25 (26) Paired dark stripes occur in median lines. 



Gordius leidyi Montgomery i8q8. 



Male of this species is unknown. Female 

 295 mm. long, 1.5 mm. broad. .Sharply dis- 

 tinguished from all other species in the genus 

 by the peculiar truncated form of the jxtstcrior 

 end and the two narrow parallel stripes of 

 intense reddish brown in the median line of 

 the dorsal groove. 



In the Leidy collection; source unknown. 



Fig. 843. Gordius leidyi 9 ; head and tail in (lor- 

 sal aspect. Magnified, (.^fter Mont^jomco') 



26 (25) Dark stripes in median lines arc lacking ^7 



The tmknown female of Gordius longareolatus probably falls here. 



27 (30) Areoles not elongated in long axis of body; head not tlailened. . i8 



28 (29) Areoles close-set, tending to produce longitudinal ridges. 



Gordius lineatus Leidy ii^5i. 

 For male and range of this species consult 16 in this key. . « 1 



Female up to 283 mm. long, 0.8 mm. broad; Hke male very slender. Deeper buff color as 



against the pale, transparent yellowish white of the male. In the female the cloacal onticc u 



surrounded by a narrow reddish-brown ring. 



29 (28) Areoles more or less confluent, tending lo produce transverse rows; 



head usually cylindrical. , ^ 



Gordius dcnsareoliilus yUmif^omvry iSgS. 



For male and range of this species consult 19 in this key. .... , ,, .1 u^u* 



Female up to 3Q5 mm. long, 1.7 mm. broad. Body roI)ust. Head white followi-d by I Rht 

 buff ring and broad reddish brown ring; cloacal pore surrounded l>y thm black ring and "r.ua« r 

 circular reddish brown area; body generally chocolate or yelU)wish brown, t l.vu.ii ■■- 

 in a ventral depression. 



