Jordan and Evermann. Pishes of North America. 1065 



covered with large, imbricated, very rough scales, these less closely set 

 below ; breast naked ; behind the ventrals the middle line of the belly 

 with some small scales, behind which is a naked space bounded by small 

 embedded scales, and extending as far as tLe vent; back, from middle of 

 first dorsal forward, naked, posteriorly more or less scaly. Fins low and 

 small, the second dorsal longer than the first or the anal, the spines 

 slender; anal spines short ; pectoral fins long and narrow. Translucent, 

 with small dark spots on back and sides, besides finer specklings ; fins 

 plain. Length 2 inches. Southeastern Virginia and eastern North Caro- 

 lina ; locally abundant in clear sandy streams in pine woods, (vitreus, 

 glassy.) 



Pcecttichthys vitreus, COPE, Proc. Amer. Philos. Soc. Phila., 1870, 263, Walnut Creek, a tribu- 

 tary of Neuse River, Wake County, North Carolina. (Coll. Cope.) 

 loa vilrea, JORDAN & GILBERT, Synopsis, 490, 1883. 

 Ammocrypta citrea, BOULENGER, Cat., i, 102. 



1453. IOA VIGIL, Hay. 



Head 3|; depth 6; eye 3, greater than snout. D. X-12; A. II, 10; scales 

 about 60 in longitudinal series. Body slender ; head long ; caudal pedun- 

 cle compressed and comparatively deep, the fish, therefore, having nearly 

 the same depth throughout its length. Top of head sloping gradually 

 from occiput to snout. Upper jaw protractile ; mouth large, terminal, 

 slightly oblique; the jaws equal, maxillary reaching anterior edge of 

 pupil; interorbital space very narrow ; jaws with recurved teeth; oper- 

 cuiar spine well developed ; opercles and cheeks naked. Dorsal fins well 

 separated ; the origin of spinous dorsal i distance from snout to base of 

 caudal, its length and its height length of head ; soft dorsal same 

 size as spinous. Length of anal fin f length of head, its height head. 

 Posterior portion of body densely scaled, anterior portion probably with 

 few scales above, but none below the lateral line. Pale straw color or 

 pellucid in life with some blotches and specks of olive, about 10 square 

 spots along the back, and about as many along the lateral line, most dis- 

 tinct posteriorly ; top of head dusky ; a small but distinct black spot at 

 base of caudal. Length 1 inch. (Hay.) Only one specimen known. 

 Pearl River, Jackson, Mississippi; a rather doubtful species, possibly a 

 variation of Ammocrypta faanii. (vigil, wide awake.) 



loa vigil, HAY, Bull. U. S. Fish Comm., n, 1882 (1883), 59, Pearl River, Jackson, Missis- 

 sippi. (Coll. Hay.) 



The genus Ammocrypta represents the extreme of development of the 

 series of darters with elongate bodies, a natural series being formed from 

 Percina through Hadropterus, Ulocentra, and Boleosoma to Crystallaria and 

 Ammocrypta. Another well-marked series, at first parallel with these and 

 closely related to its members, leads off from Hadropterus and Ulocentra 

 through Etheostoma, culminating in Microperca. This second series is 

 distinguished as a whole by firmer skeleton with fewer vertebrae, the 

 skull more convex in cross section, the anal fin smaller and the fin rays 

 tending to become fewer. In habits, the species of the second group are 



