322 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
mouth, beginning at the base of the anterior barbel and continuing 
posteriorly are parallel lines of pores, close together but on the cheek 
these lines are much farther apart; in front of isthmus on under side 
of head between dentary bones many of these lines of pores cross close 
together. A few of the vertical lines are present on the opercular 
apparatus. These parallel lines are most apparent on the top of the 
head between the front. of the eyes and dorsal surface of the snout, 
but absent on tip of snout and along middle sides of snout where the 
blackish lateral band extends forward to tip of snout. Scales with 
the striae arranged like the spokes in a wheel (radiately striated) ; 
mouth short, a little oblique, not reaching to below front of eye; gill 
membranes broadly joined to the isthmus; snout bluntly rounded; 
premaxillaries protractile; lower lip with a frenum at tip of chin, 
the edge of lip not free across the chin; no frenum on upper lip; 
interorbital space flat; the dorsal contour from origin of dorsal to over 
front of eyes almost straight; the greatest depth of body at origin 
of dorsal; pectorals not quite reaching to insertion of pelvics and 
the latter reaching to anus but not quite to the anal fin origin; pec- 
torals pointed, the upper ray longest; first rays of dorsal and anal 
longest; the posterior margin of the dorsal a little concave, that of 
the anal truncate to a trifle concave; caudal fin forked; gill rakers 
short and blunt 2+5; pelvics with accessory scale. 
The color pattern consists of a black lateral band along the mid- 
axis of the body from tip of snout to midbasal portion of caudal fin 
rays more or less visible to tip of these rays on most specimens; 
on some specimens the black lateral band is more intense on the 
opercle almost forming a blackish blotch; posterior margin of the 
scales pigmented, intensely black along lateral line but not inter- 
rupted by the lateral line to form a lght of pale streak along the 
lateral line; upper ray of pectoral a little blackish, second simple 
ray of dorsal blackish, anterior tip of dorsal fin blackish, this pigment 
sometimes including a little of the membrane of the third branched 
ray ; other fins plain pale. 
Remarks.—This new species may be closely related to Barbus 
gambiensis Svensson because the author mentions “head with numer- 
ous lines of fine pores likely belonging to the censory lateral line 
system” but these are not shown in his figure unless they are rep- 
resented by the lengthwise lines under the eye. Barbus gambiensis 
differs from the new species in having 12 scales around the caudal 
peduncle, 23 to 25 scale rows instead of 10 and 22 to 24 respectively. 
In addition the black line above the lateral black band is absent in 
Mannichthys lucileae. 
Named duetleae in honor of Lucile Mann, wife and companion of 
Dr. William Mann. 
