Fish from the French Congo. 115. 
In 1898 I gave a synopsis * of the sevem species of this 
genus then known to me. As the number has now risen to 
thirteen it is advisable to publish a new key to their identifi- 
cation :— 
I. 6 or 7 series of teeth in the jaws; D. XIV 11-12; 
pectoral ae as long as head; caudal emar- 
PB 
ginate; sq. 2 = = Sof oon0s060.00 Mme wees 1, P. Buettikoferi,, 
Stdr. 
II. 2 to 5 series of teeth in the jaws. a 
A. Lower lateral line at least nearly as long ay 
upper; pectoral at least as long as head ; 
caudal truncate or cmarginate 
—B6 
D. XIMI-XIV 16-17; sq. 88-40 —3_; lat.1. =, 2. P. Jentinks, 
re a [Stdr. 
6— 
D. XV-XVI 14-15; sq. 55-58 3 = ; lat. 1. a = .. 8. P. polylepis, 
[ Bler. 
7 5 
D. XIV-XVI 12-14; sq. 31-86 2; lat. 1. 24-27 | 4. P. lateralis, 
S10 re [Bler. 
B. Lower lateral line short, confined to the caudal 
region. 
1D XIE 11; pectoral as long as head ; St 
28-30 Pr 1s Poteet ena TRADE oct, 5. P.congicus, Bley. 
2. D. XIV-XVI 8-11; pectoral 2 to 2 length 
of head. 
a, Caudal truncate or rounded-subtruncate ; 
snout much longer than diameter of eye ; 
maxillary not extending to below ante- 
rior border of eye. [Blgr 
gr. 
Sq. 32° 9 5 © Series of scales on cheek ............ 6. P.. Welwitschir, 
Sq- 29-31 2 3 or 4 series of scales on cheek .... 7. P. Guentheri, 
6. Caudal rounded or rounded-subacuminate ; [Sauv. 
sq. 26-29 7. 
a. Snout longer than diameter of_eye,; 
maxillary not extending quite to below 
anterior border of eye; last dorsal 
spine longest; 4 series of scales on 
Checkin t Vachs eis MLA Oe any 8. P. Batesit, Blgr. 
QB. Snout not longer than eye. 
* Dorsal spines subequal from the fifth.. 
Maxillary extending to below anterior border of eye ; 
3 series of scales on cheek; dorsal spines: rather 
more than 3 length of cere, Doerr 9. P. ocellifer, 
Maxillary not extending to below anterior border [ Blgr. 
of eye; 3 or 4 series of scales on cheek; dorsal 
spines not quite 3 length of head ............ 10. P. Ansorgia,. 
Maxillary extending to below anterior border of eye ; [Blegr. 
* Proc. Zool. Soc. 1898, p, 147. 
