572 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



and Rawson (1957); and for the three European species, see data 

 presented by Berg (1949). Vladykov (1931) and Oliva (1953) 

 reported that males of S. lucioperca have relatively longer fins than 

 the females. Vladykov (1931) noted the same for S. volgense. 



Tribe Roinanichthyini 

 Genus Zingel Cloquet 



There are three species in this genus: asper (Linnaeus), streber 

 (Siebold), and zingel (Linnaeus). Both sexes of Z. streber and Z. 

 zingel are tuberculate; Z. asper also will probably be found to be so. 



I have examined 10 tuberculate males of Zingel streber (ANSP 82497, 

 Rumania, Mures R., 108 mm.; USNM 187742, Rumania, Criscul R., 

 57-108 mm.; and USNM 190212, Rumania, Timis R., 98-99 mm.), all 

 collected in October, and 9 tuberculate females from the same collec- 

 tions, plus USNM 187740 (Criscul R., April, 131 mm.). In the male, 

 where they are best developed (USNM 190212, 99 mm.), tubercles 

 are present on all the head scales including those on the opercle and 

 preopercle. These tubercles are elongated longitudinally with the 

 point of the tubercle projecting upward and posteriorly beyond the 

 margin of the scale. A few head scales have two tubercles per scale, 

 but the majority only have one. Prominent ridgelike tubercles are 

 developed on all the body scales above the lateral line posterior as 

 far as the middle of the caudal peduncle. They are also present on 

 several rows of scales below the lateral line in the region posterior to 

 the tip of the pectoral fin. The females and the other males have a 

 similar pattern of tubercle development, but the tubercles are more 

 ridgelike and less prominent and are not on as many scales. The 

 individual tubercles are aligned in the same direction from one scale 

 to the next, creating continuous ridges along the body. Among the 

 Percidae, this condition is unique in the genus Zingel. None of the 

 tuberculate specimens show any sign of tubercles on any of the fins. 

 Rudolph J. Miller examined a 150 mm. gravid tuberculate female of 

 Z. streber (Charles University No. 9908, Czechoslovakia, Orawa R., 

 April 4) and he corroborates what I have found, although the tubercles 

 seem to have been somewhat better developed than in the females I 

 examined. Vladykov (1931) reported that Zingel streber had tubercles 

 on the pectoral fins as well as on the head and the body. 



I have examined one tuberculate specimen of Zingel zingel, a 175 mm. 

 male that Dr. Miller found for me (Charles University no. 4514, 

 Czechoslovakia, Danube R., May 5). There are tubercles on all the 

 head scales and on the dorsal and dorsolateral body scales. These 

 tubercles are only slightly raised and do not form longitudinal rows as 

 they do in Z. streber. There are tubercles on the anterior ten rays in 



