170 CALIFORNIA ACADEMY OF SCIENCES 



to the upper end of the pectoral base, but is not well marked posteriorly. The lower 

 runs backward and slightly downward across cheeks to the preoj^ercular margin. The 

 lower part of cheeks is crossed nearly vertically by three broad dark shades separated 

 by two narrow light streaks. In none of our specimens, do we note the bar described 

 by Kner and Steindachner beginning at the angle of the mouth and joining the 

 second bar at preopercular margin. All of the fins are dark, rather finely barred 

 with blackish and lighter. The spinous dorsal has usually a rather wide translucent 

 margin, and a submedial lengthwise translucent streak. 



The teeth are equal or nearly so. In young .specimens, a slight enlargement 

 of the outer mandibular teeth can often be detected. 



In specimens of Eleotris pisonis from Havana (Rio Almendares), the outer 

 series in the upper jaw are slightly enlarged, more noticeably on the sides than in 

 the front of the jaw. A few of the posterior teeth near the middle line of the upper 

 jaw are also slightly enlarged. In the medial portion of the mandibles, the anterior 

 row is slightly larger. The inner mandibular series is also enlarged, the teeth increas- 

 ing in size laterally where the band narrows to a single series. 



In U. abacurus, the teeth are similar to those of U. jnsonis, but the canines are 

 much larger. Both outer and inner series are enlarged in the upper jaw, the inner 

 series less so, and the teeth are declined. It is extremely probable that U. ahacurus 

 is a synonym of E. arnblyopsis. 



308. Alexurus armiger Jordan £ Richardson. 



A single specimen, 172 mm. long, slightly larger than the type. This is the 

 second individual to be reported, and extends the known habitat of the species from 

 La Paz, L. C, to Panama. 



The type description needs modification in the following respects: The 

 diameter of the eye is contained 9i times, the length of the snout 5 times in the 

 length of the head. There are broad bands of villiform teeth in each jaw, the outer 

 series enlarged to form small canines. In the upper jaw, these increase in size 

 laterally, and extend as far as does the villiform band. The inner teeth are not 

 enlarged. In the mandible, the outer canines are confined to the central portion of 

 the jaw, numbering only about 5 on each side of the symphysis. The teeth of the 

 inner mandibular series are also enlarged, but less so than the outer, and are directed 

 backward. 



The cheeks and opercles are wholly covered with cycloid scales similar to 

 those on the occiput. They do not overlap, and are more or less embedded and 

 concealed. 



As indicated in the published drawing of the type (Jordan, 1895 b, 

 PI. XLVIII), the rays of the procurrent portion of the caudal fin are unbranched 

 and not articulated. 



In the Panama specimen, the fin rays number: dorsal VI, 14, anal 11. 



309. Gymneleotris seminudus {Giinther). 

 Only the type known from Panama. 



