50 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
rounded margins ; occurring at intervals, but sparsely, are club-shaped slender 
hyaline processes such as are characteristic of the genus, and these are about 
double the height of the tubercles ; and also small inter-tubercular groups of 
short, spiniform hairs. 
Color. Inthe males the head is yellowish white, with a narrow black ring (ap- 
pearing like a spot) immediately around the mouth; the rest of the body a deep 
chocolate-color, or rufous-brown, with evidences of lighter brown bands and 
spots on the posterior end, though these spots were absent in one individual; 
in the smallest male the body color was a clear yellowish brown. In the 
single female specimen a black ring immediately surrounded the mouth open- 
ing; but the rest of the body is a clear yellow, the head and posterior tip of 
the body somewhat lighter. 
Dimensions. Length of largest male, 215 mm.; greatest diameter, 1.38 mm. 
Length of female, 150 mm.; greatest diameter, .8 mm. 
Diagnostic Characters. The presence of flattened tubercles, resembling the 
cuticular areoles of the genus Gordius, none of which have a light spot on the 
surface, and which tend to arrange themselves into irregular oblique rows, and 
the presence of inter-tubercular groups of small] hairs, serve to distinguish this 
species. 
Comparisons. This species resembles most closely C. occidentalis, n. sp. 
(q. v.). It also bears some resemblance to C. moluccanus Romer (’96), but 
differs from the latter in the form and more especially the arrangement of 
the tubercles of the cuticle, and in the swelling of the posterior end of the 
female. 
The cuticle of this species resembles that of a Gordius rather than that of a 
Chordodes, except that it shaws the typical hyaline processes of the latter 
genus ; and since its cuticle thus unites characters of these two genera, the 
specific name gordioides is suggested. 
16. C. occidentalis, n. sp. 
Figs. 111-114, Plate 14; Figs. 115-117, Plate 15. 
(Type 1 male: Harvard coll. no. 1469, San Francisco, Cal. A second male: 
Harvard coll. no. 1481, Rio Gila, Arizona.) 
Form. Whole body much flattened dorso-ventrally, with the exception of 
the posterior end, in the type without, in the second specimen with, shallow 
median grooves ; anterior and posterior ends narrower than the middle portion 
of the body, though the anterior end is attenuated only for a distance of about 
lem. Head (Figs. 111, a, b) flattened, conical, the tip rounded or else obtusely 
truncated, and then the dorsal margin projects farther forward than does the 
ventral. Mouth terminal. In the second specimen (Figs. 114, a, b) a Y-shaped 
ridge is situated on the terminal aspect of the head, the mouth placed at the 
point of union of the three arms of the Y; the unpaired arm of this Y-shaped 
ridge runs from the mouth mediad and dorsal, the paired arms latero-ventrad, 
