370 
BULLETIN OF THE BUREAU OF FISHERIES 
41. Hadropterus maculatus (Girard) . Black-sided darter. [Alvordius maculatus 
Girard. Jordan, Evermann, Clark, p. 283.] 
RECORD OF CAPTURE 
This rather uncommon darter is found in many of the warmer tributary streams. 
The single specimen represented in our collections was seined in Ellicott Creek on 
August 1, 1928. 
DESCRIPTION 
Two anal spines and nonprotractile premaxillaries are characters which the black- 
sided darter has in common with the log perch, separating them from other darters, 
but the absence of a conical projection of the snout which typifies the log perch, and 
vertebral count of 42 or less, distinguishes the present species. 
41 . 0 -millimeter stage. — Total length, 41.0; standard length, 35.0; length to vent, 
21.5; length of head, 9.0; greatest depth, 6.4; diameter of eye, 2.6 millimeters. Myo- 
meres, 20 to vent plus 22 behind. Dorsal XII, 13; anal II, 10; caudal only slightly 
emarginate; ventrals just behind pectoral base. Body elongate, fusiform; head 
long and pointed; mouth rather wide, subinferior, lower jaw included. 
Pigmentation.— A black streak occurs on upper jaw, and a wide longitudinal 
stripe from tip of snout through eye to back of head. The top of head and interorbital 
space are heavily pigmented from occiput to dorsal fin, and the whole dorsal aspect 
is covered with small chromatophores gradually becoming a pattern outlining the 
scale arrangement. On lateral line, 5 large and 2 small patches are evident where 
the scales are outlined and crowded with chromatophores (lateral line practically 
straight, curving downward only slightly to region of vent). The dorso-lateral region 
is patterned like python skin, that is, the scales are outlined to make an irregular 
pattern of lighter and darker patches. Chromatophores occur at margin of anal 
and a single series a short distance behind. The ventrals are the only fins unmarked. 
BREEDING 
The black-sided darter spawns in spring in shallow water over a stony bottom. 
42. Percina caprodes zebra (Agassiz). Log perch. [ Percina zebra (Agassiz). 
Jordan, Evermann, Clark, p. 283.] 
RECORD OF CAPTURE 
Adults were taken in Petersen and Helgoland trawls and seines near shore 
during July and August, 1928. Larvae and postlarvae from 6 to 24 millimeters were 
taken in western Lake Erie from June 29 to July 3, and a single specimen 6.5 milli- 
meters long was taken on August 20 in a bottom towing in 13 meters off Point Pelee, 
also in the far western section. 
Although the longer intestine and other characters eliminate Perea , the head 
resembles this genus so much that Percina, in which the head is similar to Perea, is 
immediately suggested. In the larva the moderate subinferior mouth, sharp pointed 
teeth, rudimentary air bladder, and large pectorals and in later stages the subtrun- 
cate snout, which begins to be evident soon after a length of 12 millimeters is attained, 
are characteristic. 
