eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 155 



Microglanis gen. nov. 11 



Type, Microglanis poecilus sp. nov. 



Small Pimelodines, reaching a maximum length of 110 mm., with the head as 

 wide as long, the skull covered by skin only; the occipital crest small; frontal 

 fontanel not extending much if any behind the eye, sometimes a minute occipital 

 fontanel. Eye without a free orbital margin; dorsal and pectoral spines well- 

 developed; premaxillary patches of teeth without backward projecting angles. 



The species of this genus parahybm and pulcher are variegated and marked 

 with three more or less well-defined cross-bands, one over the nape, one behind the 

 dorsal, and one across the caudal peduncle. 



31. Microglanis poecilus sp. nov. 12 (Plate XII, fig. 2.) 



Eight specimens, 22-37 mm. Below Packeoo Falls. (C. M. Cat. No. 1676 

 a and b; I. U. Cat. No. 12055.) 



The larger of the two specimens in the Carnegie Museum (a) may be considered 

 the type. 



Head as wide as long, 3.4 in the length; depth 6; D. 1,6; A. 9; eye 2.5 in 

 snout, 8 in head, 3.5 in distance between the eyes. 



Head depressed, snout rounded; barbels banded, the maxillary barbel reaching 

 tip of humeral process, post-mental to base of last pectoral ray; mental barbel 

 considerably in advance of the post-mentals; mouth wide, but its angle in front 

 of the eye; lower jaw slightly projecting; anterior nares not tubular. 



Distance of dorsal from snout 2.4 in the length, the spine about twice as long- 

 as the eye; pectoral spine strong, with large teeth along the entire length of both 

 margins, half of those of the outer margin retrorse, the other half antrorse; ventrals 

 inserted behind the vertical from the last dorsal ray, just reaching the rounded 

 anal; base of dorsal, adipose, and anal about equal in length; upper caudal lobe 

 longer than head. 



A light, wavy band across the nape from the pectoral to pectoral; a light spot 

 at base of dorsal spine; a light band downward and backward from behind the 

 dorsal, joining another light band which extends upward but not to the dorsal spine; 

 an oval light area in front of adipose; a light band across caudal peduncle; some 

 light vermiculations about the snout; the light areas sometimes bordered by white, 

 the extent of light and dark brown varying greatly, sometimes one and sometimes 

 the other predominating. Pectoral light, with an oblique dark band; dorsal black, 



11 ixUpos, small, 7X01-15, cat-fish. 



12 The duplicates of this new species were distributed as Batrachoglanis raninus. 



