612 The American Naturalist. [July, 
Depth 3-34; head 33. D.11; A. 22-23 scales; 30, tubes 6. Snout 
very short, the maxillary extending beyond the anterior margin of the 
e. 
A small circular humeral spot present, sometimes reduced to two or 
three color cells. A large black spot on the upper half of the first 
dorsal rays, the tips of these rays white. A small black spot near the 
tip of the first fur and rays. 
A. agassizi Steind. differs from A. mazillaris mainly in its larger 
number of anal rays. Brazil, 10 specimens, 10-11 mm. long. 
6. Aphyocarax heteresthes. Maxillary teeth six, conical. Intermaxil- 
lary with eight conical teeth and two with lateral cusps on each side. 
This species is related to A. agassizii Steindachner and A. eques Stein- 
dachner. From the former it differs in having only the upper part of 
the maxillary dentiferous and apparently in having the anal rays 
graduated. From the latter it differs chiefly in having no humeral 
spot. 
Depth 3; head 33. D. 11; A. 27-30; scales about 31. Snout 
very short, maxillary long, extending considerably beyond the ante- 
rior margin of theeye. Eye twice the length of the snout, ? the length 
of the head. Origin of the dorsal midway betweeen the tip of the snout» 
and the base of the caudal. Upper half of the first five developed 
rays of the dorsal black. 
Brazil, 6 specimens, 14-17 mm. long. 
7. Mylesinus macropterus. Body deep, 1? in the length. Head 33. 
Abdominal serrations 11 behind the ventrals, the posterior four in 
pairs, 22 to 25 smaller ones before the ventrals. 
D.L16; A.36; V.7. Sealessmall, about 83 in the lateral line which 
is deeply curved below the origin of the dorsal. Height of dorsal fin 
23 times its length, the second and third rays greatly elongate, the 
fourth ray about half as long. Anal without lobes. 
Snout little more than half as long as the diameter of the eye, the 
inter-orbital space a little more than the diameter of the eye. Lower 
jaw greatly projecting. Teeth in the mandibles in one series, notched 
and wide a 
Brazil, 1 specimen 9 em. long. 
ALBERT B. Urnzv, Bloomington, Ind. 
On the Species of Himantodes D. & B.— This genus of snakes 
is represented by numerous individuals in tropical America, and suffi- 
cient material is now at hand to render it possible to determine the 
number of species to which they belong. An examination shows that 
