466 DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 
the soft portions of the dorsal and anal slightly produced, the former extending nearly 
to the middle of the caudal. Free portion of the tail as high as long. Caudal slightly 
emarginate, its length being considerably more than one-fifth of the total. The ventral 
has the outer ray much produced, and reaches to the sixth anal spine. 
183. Heros copManni. (Plate LX XIV. fig. 5.) 
Giinth. Fish. iv. p. 296. 
Dee | Aeg. Te Jat. 38.) Li tranay. 6/13. 
The fold of the lower lip is interrupted in the middle; six or seven series of scales on 
the cheek. The height of the body is contained twice and three-fourths in the total 
length (without caudal), the length of the head thrice or thrice and a third. The 
profile of the nape is much curved. Head rather longer than high; snout rather 
elevated, the preorbital being wider than the orbit. Cleft of the mouth rather narrow, 
horizontal, with the jaws equal anteriorly, and with the maxillary not extending 
backwards to the vertical from the front margin of the eye. The nape is elevated, and 
the orbit considerably below the upper profile of the head. Dorsal and anal fins very 
slightly scaly at the base; the spinous dorsal is low, the length of the twelfth spine 
being one-fourth of that of the head. The free portion of the tail is a little longer 
than high. Head greyish olive ; cheeks and body reddish olive; an irregular blackish 
band proceeds from above the pectoral to a black spot in the middle of the root of the 
caudal. A black spot above the origin of the lateral band. Opercles, back, and vertical 
fins with black dots. 
Two specimens, 7 inches long, were collected by Mr. Salvin in the River of Cahabon. 
184. Heros sIEBOLDII. 
Kner & Steindachner, Abhandl. bayer. Ak. Wiss. x. (1864) p. 13, Taf. 2. fig. 2. 
This fish is probably not sufficiently distinct from H. godmanni; it is from New Gra- 
nada, and the dark markings are arranged in irregular cross bands. 
185. Heros eurtuatus. (Plate LX XVIIL fig. 3.) 
Ginth. Proc. Zool. Soc. 1864, p. 152. 
D. ue A. . L. lat. 33. L. transv. 2 
i2" 
Very closely allied to H. godmanni. 
The fold of the lower lip is interrupted in the middle. The height of the body is 
contained twice and three-fifths in the total length (without caudal), the length of the 
head thrice and a fifth. Head as high as long. The upper profile of the head descend- 
ing in a gentle curve. Scales on the cheek in four or five series. The first dorsal spine 
