99. With a dark hand lengthwise along each side; central states 

 Zygonectes notatus (Raf.) Striped Top'minnow 

 Fundulns notatus (Raf.) 

 Plain greenish colored; S. D. to Colorado 



Zygonectes sciadicus (Cope) Western Top-minnow 

 (Fundulus sciad]cus Cope) 



100. Fins red; with about fifteen faint cross bars; N. Y. to Florida 



Zygonectes cmguhtus (C. & V.) Banded Top-minnow 

 (Fundulus cingulatus C. 6? V.) 

 Fins not red; with nine to twelve cross bars or with lengthwise stripes or 

 rows of spots 101. 



101. Scales dark-edged, with these spots arranged in lengthwise rows; Gulf 



states 



Zygonectes guttatus Agassis Spotted Top-minnow 

 (Fundulus guttatus (Agassiz) ) 

 Male with rows of dark spots and with dark bars; female with dark 

 stripes; central states 



Zygonectes dispar Agassiz; Starhead Top-minnow 

 Fundulus dispar Agassiz 



102. Depth of body almost one-half the length, with the anterior area elevat' 



ed; females dark barred; males blue above, yellow to red below 103. 

 Body more slender 104. 



103. In the Atlantic and Gulf states 



Cyprinodon variegatus Lacepede Sheephead Minnow, 

 Pursy Minnow 

 Desert species of the southwest 



Cyprinodon macularius B. ^ G. Desert Minnow 



104. Scale count usually over forty or length about five times depth or both 



105. 

 Scale count usually less than forty; body less slender 108. 



105. Body orange spotted 106. 

 Sides with dark bars 107. 



106. Scales with orange spots forming rows; south-central states and Ozark 



region 



'X.enisma catenatum (Storer) Studfish 

 Body irregularly orange spotted; Alabama river system 

 %enisma stellifer Jordan Alabama Studfish 



107. Body slender, being almost five times as long as deep; scale count 35 to 



55; eastern and north-central U. S. (Subspecies menona is the west' 

 ern subspecies distinguished by having diifuse bars forming a length' 

 wise stripe toward the tail) 



Zygonectes diaphanus (LeSueur) Menona Top-minnow 

 Fundidus diaphanus (LeSueur) 

 Body less slender; scale count about 60; S. D. to New Mexico 

 Plancterus zebra (Girard) Zebra Top-minnow 

 (Fundulus zehrinus J. & G.) 



270 



