BARRED KILLIFISH. 903 
104. FuNDULUS DIAPHANUS (LeS.) Agassiz. 
Barred Killifish; Toothed Minnow. 
Hydrargyra diaphana, LeESuLnvuR, Journ. Acad. Nat. Sci. Phila., i, 1817, 130. 
Fundulus diaphanus, AGASS1Z.—JORDAN, Man. Vert., 1876, —; Man. Vert. 2d Ed., 1878, 
262. 
Hydrargyra multifasciata, LESurUR, Journ. Acad. Nat, Sci. Phila., i, 1877, 131. 
Fundulus multifasciatus, Cuv.et VAL., Hist. Nat. des Poiss., xviii, 200.—Cops, Proc. Acad. 
Nat Sci. Phila, 1865, 78.—SrormR, Hist. Fishes Mass., 1867, —.—GuNTHER, Cat. 
Fishes Brit. Mus., vi, 1866, 324.—Copx and Yarrow, Wheeler’s Rept , Surveys, etc, 
Fishes, 1877, —-, and of most recent writers. 
Description.— Body elongated, somewhat compressed, the head flattened above and 
moderately broad ; depth 44 to 5in length; head 72; eye large, 3-2% in head, a little 
less than the width of the interorbital space; mouth moderate, of the usual form 
among Cyprinodonts ; vent about midway between middle of caudal and front of eye; 
scales rather large, in 38 to 40 transverse rows; D. i2 or 13; A. 11 or 12; V.6; branch- 
iostegals 5; color olive-brown, more or less translucent; sides silvery with 12 to 16 
dark olive- brown cross bands, somewhat undulating or irregular, rather narrower than 
the interspaces; dorsal region irregularly spotted with darker ; fins unspotted. Length, 
3 inches. 
Habitat, this species occurs abundantly in the brackish waters along our eastern 
coast. It also ascends ali streams to their sources, being especially fond of the cold 
spring water in which they take their rise. It has been taken in various streams of 
Michigan, Wisconsin, Ohio, and even in Colorado, and in all waters in the State of New 
York. LeSueuz’s original types were from Saratoga Lake. 
Diagnosis.—This species may be known at once among our small fishes 
by the posterior dorsal, all of soft rays, in connection with the dark bars 
on the side. 
Habits —In Ohio, this species will be found chiefly in the small lakes 
and ponds in the northern part of the State. Its size is too small for it 
to attract special attention. Like all the members of its family, it is ex- 
tremely tenacious of life. 
oe Genus 56. ZYGONECTES. Agassiz. 
Zygonectes, AGASSIZ, American Journ. Sci. Arts, 1654, 135. 
Micristius, Gitt, Canadian Naturalist, August, 1865, p. 24. (Type, Fundulus zonatus 
Cuv. and VAL.) 
Fundulus, Haplochilus, and Pecilia, sp. of authors. 
Type, Pecilia olivacea Storer, = Semotilus notatus, Raf. 
Etymology, zugos, a yoke (in pairs); necies, swimmer, from the supposel habit of 
swimming at the surface of the water in pairs. 
This genus is closely related to Fundulus, differing chiefly in the small size and 
posterior position of ihe dorsal, which has usually less than ten rays and is commonly 
inserted behind the front of the anal fin; the species are smaller in size than those of 
