474 



BULLETIN OF THE BUREAU OF FISHERIES 



Size variations. — By far the majority of specimens collected have been gilled in 

 23^-inch nets and therefore are longer than 200 millimeters. Five individuals over 

 200 millimeters in length and five smaller are extensively compared in Table 65. 

 It appears that the larger specimens tend to have a proportionally smaller head and 

 eye, more body depth, and possibly shorter paired fins. 



The smallest specimen collected measured 128 millimeters and was a female 

 with maturing ova. 



COMPAEISONS 



Hoyi approaches both Tciyi and artedi rather closely, but usually may be separated 

 from artedi by a consideration of several characters. Hoyi has a relatively longer 

 maxillary, snout, paired fins, mandible, head, and eye, and the body is more com- 

 pressed as a rule and less elongated. The mandible also is frailer in artedi and seldom 

 shows the symphysial knob of hoyi. The shortness of the mandible alters the shape 

 of the head, which, seen from the side, is less sharply triangular in artedi. Characters 

 that are of taxonomic use and that can be expressed numerically are given for the 

 two species below : 39 



Gill rakers on the first branchial arch: 



hoyi, (39) 42-47 (50) , with 4 per cent more than 47. 



artedi, (41) 46-50 (54), with 52 per cent more than 47. 

 Lateral-line scales: 



hoyi, (63) 67-76 (82), with 8 per cent more than 76. 



artedi, (66) 73-82 (89), with 54 per cent more than 76. 

 L/H:<° 



hoyi, (3.8) 4-4.2 (4.6), with 18 per cent more than 4.2. 

 artedi, (3.7) 4.3-4.7 (4.9), with 89 per cent more than 4.2. 

 H/E:« 



hoyi, (4) 4.1-4.4 (4.7), with 12 per cent more than 4.4. 

 artedi, (3.9) 4.1-4.4 (4.9), with 22 per cent more than 4.4. 

 H/M: 



hoyi, 2.5-2.7 (2.9), with 10 per cent more than 2.7. 

 artedi, (2.5) 2.7-2.9 (3.3), with 60 per cent more than 2.7. 



H/S: 



hoyi, (3.4) 3.6-3.8 (4), with 16 per cent more than 3.8. 

 artedi, (3.4) 3.7-4 (4.5), with 47 per cent more than 3.8. 

 Pv/P: 



hoyi, (1.4) 1.7-2 (2.2), with 8 per cent more than 2. 

 artedi, (1.7) 1.9-2.1 (2.5), with 38 per cent more than 2. 

 Av/V: 



hoyi, (1.1) 1.3-1.5 (1.6), with 7 per cent more than 1.5. 

 artedi, (1.3) 1.5-1.8 (2), with 72 per cent more than 1.5. 

 Mandible compared with upper jaw: 



hoyi, shorter 5 equal 47 longer 199 or 79 per cent longer. 

 artedi, shorter 130 equal 121 longer 77 or 23 per cent longer. 



A discussion of the differences between hoyi and Tciyi is given on page 446 and 

 between hoyijm.& reighardi on page 414. In view of the fact that only one specimen 

 of the Ontario representative of Leucichthys nigripinnis is preserved, it is not possible 



s» Figures for counts are given for all collected specimens. Proportions are given for specimens 225 millimeters or more in length 

 in the case of artedi and for hoyi for those 200 millimeters or longer. 



«o These proportions are those most affected by growth, and as the artedi average considerably larger, the figures have no other 

 value than to indicate that in general artedi has a somewhat smaller head and eye. • 



