GREAT LAKES COREGONIDS 



411 



the first branchial arch, while artedi is not known to have less. Reighardi also has a 

 longer head, a longer maxillary, longer paired fins, and fewer scales in the lateral line. 

 A comparison of these characters for the two species follows: 



L/H: 



reighardi, (3.7) 3.9-4.2 (4.4), with 3 per cent more than 4.2. 

 artedi, (4) 4.3-4.6 (4.9), with 88 per cent more than 4.2. 

 H/M: 



reighardi, (2.3) 2.4-2.6 (2.7), with 4 per cent more than 2.6. 

 artedi, (2.6) 2.7-3 (3.2), with 91 per cent more than 2.6. 

 Pv/P: 



reighardi, (1.5) 1.8-2 (2.4), with 14 per cent more than 2. 

 artedi, (1.6) 2-2.3 (2.6), with 63 per cent more than 2. 

 Av/V: 



reighardi, (1.2) 1.4-1.7 (1.9), with 3 per cent more than 1.7. 

 artedi, (1.3) 1.6-1.9 (2), with 36 per cent more than 1.7. 

 Lateral-line scales: 



reighardi, (65) 71-77 (83), with 2 per cent more than 80. 

 artedi, (72) 84-93 (105), with 85 per cent more than 80. 



Reighardi differs from nigripinnis cyanopterus in having fewer gill rakers, fewer 

 scales in the lateral line, a larger eye, and a much more terete body. The compara- 

 tive figures for certain of these characters follow: 



Gill rakers on the first branchial arch: 



reighardi, (32) 34-38 (42), with 10 per cent more than 38. 



nigripinnis, (36) 38-42 (48) with 84 per cent more than 38. 

 Lateral-line scales: 



reighardi, (65) 71-77 (83), with 2 per cent more than 80. 



nigripinnis, (73) 79-86 (91), with 72 per cent more than 80. 

 H/E: 



reighardi, (3.6) 3.9-4.2 (5), with 9 per cent more than 4.2. 

 nigripinnis, (4) 4.3-4.6 (5.2), with 85 per cent more than 4.2. 



The paired fins also average shorter in reighardi, the dorsal contour of the pec- 

 toral usually is straight rather than decurved, and the body and fins are paler. 



Reighardi is distinguishable from Tciyi and hoyi by its more terete shape, its 

 included mandible, greater adult size, fewer gill rakers on the first branchial arch, 

 and shorter paired fins. Reighardi is further separable from Tciyi by the fewer scales in 

 the lateral line. The comparative figures for such of these characters as can be 

 expressed accurately numerically are given below: 



•Gill rakers on the first branchial arch: 



reighardi, (32) 34-38 (42), with 10 per cent more than 38. 



kiyi, (36) 37-42 (45), with 71 per cent more than 38. 



hoyi, (37) 40-45 (49), with 96 per cent more than 38. 

 Pv/P: 



reighardi, (1.5) 1.8-2 (2.4), with 62 per cent more than 1.8 

 kiyi, (1.1) 1.3-1.5 (1.7). 



hoyi, (1.4) 1.5-1.8 (2.2), with 11 per cent more than 1.8. 

 Av/V: 



reighardi, (1.2) 1.4-1.7 (1.9), with 94 per cent more than 1.3. 

 kiyi, (0.9) 1-1.2 (1.4), with 1 per cent more than 1.3. 

 hoyi, (0.9) 1.1-1.3 (1.6), with 11 per cent more than 1.3. 

 Lateral-line scales: 



reighardi, (65) 71-77 (83), with 2 per cent more than 80. 

 kiyi, (72) 76-84 (87), with 29 per cent more than 80. 

 hoyi, (65) 69-78 (84), with 2 per cent more than 80. 



