PETEESITJS. 2-31 



6. PETERSIUS. 



Hil^-end. Sitzb. Ges. naturf. Fr. Berl. 1894, p. 172 ; Bouleng. Poiss. Bass. Oonao, 

 p. 165 (1901). 



Characters of Micralestes, but distinguished by the absence of the 

 pair of conical teeth behind the mandibular series. Vertebrte 36-37 *. 

 Tropical Africa. 



Synopsis of the Sjjecies. 



I. Anterior prsemaxillary teeth alteruating with the posterior. 



A. D. 10-11 ; A. 19-26. 



1. Sc. 33-40 M 



a. A. 23-26 ; depth of body 3-3^ times in total length. 

 Sc. 40 g| ; lower jaw projecting beyond upper . 1. P. modesties, BIgr., p. 232. 

 Sc. 35-36 gl ; lower jaw not projecting beyond 



Tipper 2. P. Mlgendorfi, Blgr,, p. 232. 



h. A. 19-22. 

 Sc. 33 gl ; diameter of eye 3^ times in length of' 



head; depth of body 2f times in total length. 3. P- consenalis, Hilg., p. 233. 

 Sc. 35-36 tI ; diameter of eye 2^-2| times in 



length of head ; depth of body 3|-4 times 



in total length 4. P. tangensis, Lonnb., p. 234. 



2. Sc. 28-31 3 ; A. 22-24. 



Depth of body 3|-3§ times in total length ; 



teeth with very long median cusp . . . 5. P- leopoldianus, Blgr., p. 235. 

 Depth of body 3 times in total length . ... 6. P. hrumpti, Pellegr., p. 235. 

 Depth of body 2g-2| times in total length . . 7, P. caudalis, Blgr., p. 236. 



3. Sc. 24-26 gf ; lateral line incomplete. 



A. 20 ; depth of body 2f-2| times in total length. 8. P. pulcher, Blgr., p. 237. 

 A. 21-22 ,• depth of body 2^-2^ times in total 



length 9. P. major, Blgr., p. 237, 



B. D. 12 ; A. 14 ; Sc. 28-30 ^ . . . . 10. P. spilopterus, Blgr., p. 239. 



II. Anterior prsemaxillary teeth corresponding to the posterior. 

 Sc. 29-30 ||; A. 20-21 ; depth of body 4 times 



in total length 11. P. woosnami, Blgr., p. 239. 



Sc. 24-27 If ; A. 21-24 ; depth of body 3-3^ 



times in total length 12. P. occidentalis, Gthr., p. 240. 



* The type of the genus, P. conserialis, difEers from all its congeners by its large size as 

 well as by the complete closing up of the parietal fontanelle. 



