20.5-56 mm.; 60.120, BG203. (4) 36-39 mm.; 60.120, 

 H6204, (1) 43 mm.; 60.140, H6204, (1) 37 mm.; 60.160, 

 B6303, (2) 39.5-44 mm.; 60.160, H6204, (3) 15-51 mm.; 

 60.200, H6204, (2) 48-53 mm.; 70.60, C6208, (2) 20 

 mm.; 70.80b, B6203, (2) 14-38 mm.; 70.100, C6208, (1) 

 38 mm.; 80.55, H6204, (1) 37 mm.; 80.60, C6208, (5) 

 14.5-21 mm.; 80.70, C6208, (3) 18.5-19.5 mm.; 80.80, 

 H6204, (4) 24-43 mm.; 80.90, B6203, (2) 18.5-44.5 mm.; 

 80.100, B6203, (5) 36-50 mm.; 80.140, C6208, (2) 44-56 

 mm.; 80.150, C6208, (1) 50.5 mm.; 83.70c, B6303, (1) 

 39.5 mm.; 83.77, C6303, (18) 23-40.5 mm.; 83.90, C6303, 

 (10) 18-47.5 mm.; 84.67, C6303, (9) 16-35.5 mm.; 84.68, 

 C6303. (3) 20-35 mm.; 84.70, C6303, (6) 20-37.5 mm.; 

 84.92, B6303, (9) 19.5-45.5 mm.; 86.92, C6303, (5) 37^3 

 mm.; 87.80, C6303, (1) 28 mm.; 90.32, B6203, (3) 16-18 

 mm.; 90.45, H6204, (1) 15.5 mm.; 90.47, C6208, (1) 46.5 

 mm.; 90.60, C6208, (1) 49.5 mm.; 90.180, C6208, (1) 58 

 mm.; 93.31, C6303, (4) 25-39 mm.; 94.29a, C6208, (3) 

 28-29.5 mm.; 97.40, C6303, (17) 18-43.5 mm.; 97.50, 

 B6203, (1) 26.5 mm.; 97.65, C6303, (4) 30.5-43 mm.; 

 100.40, H6204, (1) 21.5 mm.; 100.40, C6303, (1) 40 mm.; 

 100.60, H6204, (2) 14.5-39 mm.; 100.65, C6303, (5) 33- 

 43.5 mm.; 100.80, H6204, (1) 20 mm.; 100.90, H6204, (1) 

 35.5 mm.; 100.120, H6204, (1) 62 mm.; 103.50, C6303, (1) 

 22 mm.; 108.63, C6303, (2) 25-28 mm.; 110.46, C6303, (1) 

 26.5 mm.; 110.50, B6203, (2) 23-47.5 mm.; 120.60, H6204, 

 (2) 16-53 mm.; 123.50, B6203, (4) 19.5-60.5 mm. 



Argyropelecus hawaiensis was first described 

 as a subspecies of Argyropelecus lychnus by 

 Schultz ( 1961 :615) . With uncertainty, prompted 

 by the small number of available specimens, 

 Schultz recognized a complex of three subspecies : 



A. I. lychnus Garman, eastern Pacific and 



Atlantic; 



A. I. hawaiensis Schultz, around and north of 



Hawaiian Islands; 



A. I. sladeni Regan, western Pacific and Indian 



Oceans. 



In none of our specimens of this type is the 

 body depth of as great a percentage of standard 

 length as that given for A. sladeni by Schultz 

 (1961 and 1937:4), and we do not consider A. 

 sladeni, if valid, to occur within our area of study. 



We conclude that A. hawaiensis is a species dis- 

 tinct from A. lychnus. In our study area A. ha- 

 waiensis has the more temperate distribution, and 

 A. lychnus, the more subtropical (fig. 13A) ; but 

 both species, often represented by specimens of 

 similar size, were taken together at 11 stations of 

 the survey. With a comparable size series of ju- 

 venile and adult specimens of about 12 to 62 mm. 

 SL, certain character differences readily dis- 

 tinguish the two species. 



The upper preopercular spine in juvenile A. 

 hawaiensis curves outward and slightly dorsopos- 

 teriad in a nearly even arch, while in juvenile A. 

 lychnus it curves outward and slightly ventropos- 

 teriad at its distal end. With increased body 

 length this spine becomes relatively shorter and 

 thicker in both species, but more strongly hooked 

 upward in A. hawaiensis and more strongly 

 hooked downward and backward in A. lychnus. 



Juvenile specimens of A. hawaiensis possess 

 considerably more lateral pigment along the pos- 

 terior portion of the body (fig. 12). At about 14 







■Ml ;>•' ' 



^taSSsatt*' v 





642 



Kkiure 12. — AryyropelecuH hawa-i^nsUs. juvenile, 17 mm. SL, station 84.67, C6303. 



U.S. FISH AND WILDLIFE SERVICE 



