I30 



VERTEBRATE ANIMALS OF THE UNITED STATES 



B. nigrum (Rafinesque). Johnny darter (Fig. 59). Length 60 

 mm.; head 3.75 to 4.5; depth 5 or 6; color pale olivaceous; back speckled 

 with brown; sides with numerous small black blotches; males in spring 

 black anteriorly; opercles scaly; rays of dorsal fins IX-12 to 14; anal I, 7 

 to 9; scales 5-44 to 55-9; scales rarely 35 to 40: eastern and central 

 States; westwards to Colorado; northward to Manitoba; very common 

 in most streams, especially in small ones among weeds. 



Fig. 59. — Boleosoma nigrum {from Jordan b" Erermann). 



Subspecies of B. nigrum 



B. n. olmstedi Storer. Length 85 mm.; cheek scaly: coastwise 

 streams; south to Virginia. 



B. n. ejfulgens (Girard). Cheek and breast naked; color metalic 

 green: Maryland to North Carolina. 



B. n. vexillare Jord. Cheek naked; rays of dorsal fins VIII or IX- 10 

 to 12; anal I, 7; scales 4-35 to 47-6: Virginia; common. 



B. n. maculaticeps Cope. Head spotted; cheek naked: Catawba 

 River, North Carolina; common. 



B. susance Jordan & Swain. Length 50 mm.; head 4; depth 6.5; 

 color as in B. nigrum; rays of dorsal fins VIII-io or 11; anal I, 8; scales 

 4-45 to 50-6; head naked; body very slender: upper Cumberland River, 

 Kentucky; common. 



B. camurum Forbes. Length 60 mm.; head 4 to 4.5; depth 5.5; to 

 6.5; color as in B. nigrum; rays of dorsal fins IX or X-io or 11; anal I, 

 7 or 8; scales 5 or 6-56 to 65-11 ; lateral line ending near middle of body; 

 cheek and opercle scaly: Indiana to Iowa; southward to Alabama and 

 Texas; common towards the south. 



10. Crystallaria Jordan & Gilbert. Body elongate and very slender 

 and hyaline; lateral line complete; cheek and opercle scaly; tail forked; 

 premaxillaries not protractile; throat and belly naked: i species. 



C. asprella (Jordan). Length 80 mm.; head 4 to 4.5; depth 7 or 8; 

 color olive, with 4 or 5 dark cross bands on the back and a dark lateral 



