MUSEUM OF COMPARATIVE ZOOLOGY. 93 



Alburnellus megalops Girakd. 

 Sutherland Springs, Texas. 



Gambusia patruelis Baird & Girard. 



Fern. D. 8 ; A. 8 ; V. 6 ; P. 14 ; L. lat. 31 ; L. trans. 8. 

 San Antonio, Texas. 



Mas. D. 9 ; A. 3 + 6 ; V. 6 ; P. 14 ; L. lat. 31 ; L. trans. 8. 

 Monclova, Mexico. 



Heros pavonaceus sp. nov. 



D. 16 + 12 ; A. 5 + 8 ; V. 1 + 5 ; P. 14 ; L. lat. 32 ; L. trans. 4+1 + 12. 



Head as high as long, profile nearly straight in front of the eyes. Height of 

 body equal to length of head, two and two thirds times in total length, exclu- 

 sive of the caudal fin. Outline curved on the nape. Orbit large, wider than 

 the preorbital. Mouth small, narrow, horizontal ; jaws equal in front, maxil- 

 lary not reaching back to a vertical from the anterior edge of the orbit. The 

 fold on the lower lip but slightly interrupted in the middle. Outer row of 

 teeth largest, browm-tipped. Cheek-scales in five series. Opercles scaly. A 

 few scales on the bases of dorsal and anal. Dorsal reaching its greatest height 

 at the fifth spine, fifth to the sixteenth nearly equal. Dorsal and anal extend- 

 ing beyond the root of the caudal. Caudal fin rounded posteriorly. Ventrals 

 extending to the anus in some, to the base of the anal in most. Pectorals ex- 

 tending to a vertical from the vent. In older specimens the outline from the 

 mouth to the middle of the dorsal approaches a regular very open curve. 

 Largest specimen, apparently adult, 3^, and smallest 1^^^ inches. 



Dark olivaceous brown, slightly flecked with light. Lighter below. With 

 five (4-6) more or less ocellated and vertically expanded spots of black upon the 

 flank of the posterior half of the body below the dorsal fin. An ocellate spot 

 of black on the base of the tail above the lateral line. In large and small the 

 spots are distinct ; in both there are ten or eleven faintly indicated transverse 

 bands on the sides, the posterior traversing the spots. Allied to H. angulifer. 



From a spruig near Monclova, Dr. Pahner. 



Cambeidge, Mass., January 31, 1881. 



