744 Bulletin 47, United States National Museum. 



1096. EUCALIA INCONSTANS (Kirtland). 

 (BROOK STICKLEBACK.) 



Head3; depth 4. D. IV-I, 10; A. I, 10; vertebrae 14+18 = 32. Body 

 moderately elongate, little compressed, the caudal peduncle comparatively 

 stout, not keeled. Skin smooth, entirely destitute of dermal plates, the 

 skeleton plates covered by it. Innominate bone small, lanceolate, covered 

 by the skin. Space in front of pectorals small; thoracic processes very 

 slender and widely separated, covered by skin. Gill membranes somewhat 

 free posteriorly ; gill rakers short. Dorsal spines 4 or 5, low, subequal, in 

 a right line, a cartilaginous ridge running along the base of the fin; anal 

 spine similar to dorsal spines; ventral spines short and sharp, serrated. 

 Males in spring jet black, tinged with red anteriorly; females and young 

 olivaceous, mottled, and dotted with black. Length 2i inches. New York 

 to Kansas* and northward to the Saskatchewan (Swift Current, etc. 

 Eigenmann); in fresh waters only, and especially in small brooks; abun- 

 dant in the Great Lake region and south to central Ohio and Illinois, the 

 southernmost record being from Decatur County, Indiana. (W. P. 

 Shannon.) Very variable, (inconstans, variable.) 



Gasterosleus incomtans, KIRTLAND, Bost. Journ. Nat. Hist., in, 1841, 273, brooks of Trumbull 



County, Ohio. 

 Gasierosteus micropus, COPE, Proc. Ac. Nat. Sci. Phila., 1865, 81, Fort Riley, Kansas. (Coll. 



Dr. Hammond.) 



Gasterosteus globiceps, SAUVAGE, Hevision des pinoches, 35, 1874, North America. 

 Eucalia incomtans, JORDAN, Proc. Ac. Nat. Sci. Phila., 1877, 65; EIGENMANN, Proc. Ac. Nat. Sci. 



Phila., 1886, 238. 

 Gasierosteus inconslans, JORDAN & GILBERT, Synopsis, 394, 1883. 



Represented in central and western New York by 



1096a. EUCALIA INCONSTANS CAYUGA Jordan. 



Ventral spines as long as pubic bones (usually fin inconstans); pectoral 

 plate small, U-shaped (V-shaped in inconstans). Fin rays the same, the 

 size generally smaller. Known from about Ithaca and Syracuse, N. Y., in 

 small brooks and in the lakes. 



Eucalia inconstant cayuga, JORDAN, Man. Vert., Ed. i, 249, 1876, Cayuga Lake, Ithaca, N. Y. 

 (Coll. Dr. B. G. Wilder.) 



Represented in Lake Superior by 



1096b. EUCALIA INCONSTANS PYG5LEA (Agassiz). 



D. Ill or IV, I, 6 ; A. I, 6. Said to have the body shorter and deeper, the 

 rays different. Lake Superior. (Agassiz.) If this difference in fin rays 

 really exists, this may be a distinct species, (pygmceus, dwarf.) 



Gasierosteus pygmseus, AGASSIZ, Lake Superior, 314, 1850, Lake Superior. 



* Recorded from Sukkertoppen, Greenland, by Cope, Proc. Ac. Nat. Sci. Phila., 1865, 81. This 

 record needs verification. According to Cope, the Kansas form, micropus, is shorter and deeper 

 than mcomlans, with smaller postpectoral plate and weaker ventral spines. 



