ANNOTATED LIST OF THE SPECIES 89 
Eigenmann and Higenmann, 1890, Oce. Papers Cal. Acad. Sci., I, 101; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 383. 
The Amazon from Peru to Para 
15759, 1,315 mm., Manaos, Brazil, Allen, December, 1920. 
15952, 1, 275 mm., Iquitos, Morris, 1922. 
Genus 5: MICROGLANIS Eigenmann 
Microglanis Eigenmann, 1912, Mem. Carnegie Mus., V, 155. 
Type: Microglanis poecilus Kigenmann 
Small Pimelodids having a very broad, naked head, very short occipital crest 
not approximating the dorsal fin; premaxillary teeth lacking a backward-projecting 
angle on the sides. Our collections extend the range from the Guianas to the 
upper Maranon. 
12. MicroGLaNis zoNATUS Eigenmann and Allen, sp. nov. 
Plate III, figs. 1 and 2 
15890, 1, 24 mm., type, Rio Morona (?), Allen, 1920. 
This minute specimen might be Microglanis poecilus Eigenmann if it were not 
for the hooks on the anterior edge of the pectoral spine. In two of the cotypes of 
M. poecilus the anterior hooks of the pectoral spine are in part retrorse, part an- 
trorse, the hook on the dividing line near the center of the spine being Y-shaped, 
the outer arm being antrorse like the hooks toward the end of the spine, the inner 
being retrorse like the hooks toward the base of the spine. In the specimen of the 
present species the hooks are all retrorse on one of the pectoral spines, and all but 
the ultimate one on the other spine. (Plate ITI, fig. 2.) 
Length of base of caudal 19 mm.; width of head equal to its length, 5.5 mm.; 
snout 2 mm., interorbital 3 mm., eye 1 mm., dorsal spine 3 mm., pectoral 4 mm.; 
D. I, 6; A. 9 (2); maxillary barbel reaching a little beyond tip of humeral spine; 
outer mental barbel a little beyond base of pectoral; color as in poecilus; snout 
variegated; top of head dark, the dark area continued as a bar to the lower angle 
of the opercle; a light bar from pectoral across opercle to opposite pectoral; a dark 
bar from humeral process to humeral process, joined above to similar bar from base 
of all but the last dorsal ray to the level of the humeral process; a Y-shaped band 
encircling the body near origin of anal, the anterior arm of the Y continued as a 
quadrate spot on the back, the posterior arm narrowly continued across the adipose, 
the lower arm across the anal; a narrow black band across the base of the caudal 
rays continued forward on the caudal peduncle, a narrow arm of the continued 
portion meeting its fellow at the anterior end of the dorsal fulcra of the caudal; 
margin of the dorsal white, a submarginal dark band; base of spine colorless, bases 
of the dorsal rays except the last black, the basal black united with the submarginal 
band in front; a wedge-shaped hyaline area with a few dots between the basal and 
