PAEATILAPIA. 



479 



Lake Victoria. A single male specimen was obtained by Mr. E. Degen at Buganga, 

 15.11.05. 



This species is very closely allied to, and may prove not to be separable from, the 

 preceding. 



8. PARATILAPIA BICOLOR. 



(Plate LXXXIX. fig. 1.) 



IlaplocJiromis bicolor, Boulenger, Ann. & Mag. N. H. (7) xvii. 1906,, p. 444. 



Depth of body twice and three-fifths to three times in the total length, length of head 

 twice and four-fifths to five times. Upper profile of head forming a strong curve ; 

 snout short and broad, as long as or slightly longer than the eye, which is three and 

 a half to four and a half times in the length of the head, once to once and a half in 

 the interorbital width, and once and a half to once and two-thirds the least width 

 of the prseorbital ; lower jaw not projecting; mouth not very oblique, with very thick 

 lips ; maxillary extending to below anterior border of eye, or not quite so far ; teeth 

 in three to six series in both jaws, 30 to 50 in the outer row of the upper jaw r , the 

 outer large and mostly bicuspid in the young, obtusely conical in the adult, the others 

 uni- or tricuspid ; three or four series of scales on the cheek, the depth of the scaly 

 part below the eye equal to the diameter of the eye. Gill-rakers short and stout, 7 to 9 

 on lower part of anterior arch, the larger T-shaped. Dorsal fin with 15 or 16 spines 



Measurements (in millimetres). 



Total length (without caudal) j 125 



Greatest depth of body | 47 



Length of head ! 40 



Width of head ! 21 



Length of snout I 10 



Diameter of eye j 10 



Interorbital width j 14 



Length of last dorsal spine ; 17 



„ longest soft dorsal ray j 26 



„ third anal spine . . ! 16 



longest soft anal ray 

 pectoral 



26 

 39 



105 

 38 

 35 

 18 

 10 

 10 

 12 

 15 

 22 

 14 

 21 

 36 



93 

 35 

 34 

 17 

 10 



85 

 28 

 28 

 14 



11 



8 



13 



12 



16 



14 



12 



12 



16 



15 



30 



27 



62 

 21 

 20 

 10 



H 

 H 

 H 



8 

 11 



8 

 11 

 20 



