348 MEMOIRS OF THE CARNEGIE MUSEUM. 



except for the middle ones of the inner series, which are much larger, similar to those 

 in the premaxillary of Vandellia; four rows on the premaxillary, of which the three 

 outer rows are similar to, but a little larger than, the labial teeth; the teeth of the 

 inner series are pressed together, broad, bent toward the middle line near the tip and 

 then are abruptly bent backward and inward, then outward; about fifty teeth in 

 the inner row on each side, about seventy -five in the next row; five rows of teeth 

 in the lower jaw, the outer series labial, those of the next three rows minute, re- 

 curved hooks, those of the innermost series like those of the inner series of the 

 upper jaw; eye large, without a free orbital rim; posterior nares in a line with the 

 anterior margin of the eye, much closer together than the anterior; no nasal barbel; 

 maxillary barbel broad at base entirely concealing the very minute second barbel. 

 Axillary gland large, the pectorals considerably shorter than the head; distance 

 of origin of dorsal from caudal 1.5-1.75 in its distance from the snout; origin of anal 

 under or behind the last dorsal ray; back with numerous small spots; sides with a 

 row of much larger spots; lower caudal lobe dark toward tip, base of the fin spotted 

 like the sides, upper lobe free from chromatophores toward its tip, a few spots along 

 lower margin of caudal peduncle ; dorsal with spots on its basal half. 



3. Henonemus taxistigmus (Fowler). 

 Ochmacanthus (Cobitoglanis) taxistigma Fowler, Proc. Acad. Nat. Sci. Phila., 1914, 



p. 268 (Rupununi River). 



Habitat. — Rupununi River, British Guiana. 



Known from the type, 39344 A. N. S. P., 93 mm., which I have had the oppor- 

 tunity to examine through the courtesy of Dr. H. W. Fowler. 



Head 5.5; depth 6.5; D. 10; A. 7.5; P. 7; eye 3-3.33 in the head, width of head 

 1.1, snout 3.25, width of mouth 1.5, interorbital 3.5, pectoral 1.4, lower caudal lobe 

 1.17, caudal peduncle 2.5; lower barbel one-fifth as long as the upper; upper jaw 

 with four series of teeth, upper lip with three, at least seven series in the mandible; 

 pre-opercle with five or more spines; opercle with two smaller spines; origin of 

 dorsal equidistant from tip of caudal and interopercle. 



Fig. "2"). Henonemus taxistigmus (Fowler). After Fowler. 

 Predorsal region with about four series of irregular, dusky spots, upper surface 



