oOO CALIFORNIA ACADEMY OF SCIENCES. 



ANALYSIS OF THE SPECIES OF AGEXEIOSUS. 



. Caudal forked. (Ageneioscts.) 



b. Snout short, scarcely if auj' longer than the eye; anal rays about 30; 

 branchiostegals 8. 



c. Maxillary barbel not extending beyond the rictus, the basal por- 

 tion fleshy; proflle strongly concave, the postorbital portion of the 

 head steep. Nearlj'^ plain; brown dots on head, back, and base of 

 dorsal fin. hrcvis 236. 



cc. Maxillary barbel extending bej^oud the rictus, the basal portion 

 spinous; profile almost straight, scarcely descending. Back pur- 

 plish; top of head with purplish dots, smaller points above the 

 anal; an indistinct dark lateral band; all the fins punctulate; lips 

 black. alronasus 237. 



bb. Snout long and pointed, much longer than the eye; branchiostegals 



usually 10-11. 



d. Maxillaries terminating in a branched spiny process which pro- 

 jects bej-ond the anterior margin of the eye; dorsal spines strong, 

 strong hooks on its anterior margin. 



e. Upi^er jaw projecting beyond the lower valencie.nnesi 2'i^S . 



ee. Lower jaw projecting beyond the upper. armaius 239. 



dd. Maxillaries terminating in a fleshy barbel. 

 /. Head 3|-4| in the length. 



g. Posterior margin of the pectoral sjoine serrate, at least near its 

 tip. D. I, 6. 



h. Maxillary barbel reaching the rictus, its base osseous, some- 

 times with short spines along its upper margin. Dorsal 

 spine very slender, longer than the pectoral spine; serrated 

 on its anterior margin. Ujiper portion of the head, iipper 

 half of the body and caudal yellowish, thickly spotted and 

 marbled with dark violet. Eye 3| in the snout, 8 in head. 

 Head 3|-4; depth 5i;-4^. D. I, 6; A. 39-41. (Steindachuer.) 



caucamis 240. 

 hh. Maxillary barbel not reaching the rictus, venti'als aboiit 

 reaching the anal. Br. 10-11. 



i. Depth of the intermaxillary baud of teeth in front equals 

 a diameter of the eye; snout long and pointed. Dorsal sur- 

 face dark blue, becoming abruptly pale on the sides. Head 

 3|-4. Eye 3^-4 in snout, 7^-8 in head. ucayalensis 241. 

 ii. Depth of the intermaxillary band of teeth scarcely more 

 than half as wide as the eye; snout more or less rounded 

 Head 4^-4|. Eye 2-3 in snout, 5-6 in head, dentatus 242. 

 gy. Posterior margin of the pectoral s^jine smooth. D. I, 7. Eye 

 its own diameter behind the rictus. Maxillary barbel not at- 

 taining the rictus by its own length. Pectoral si^ine 3^ in 

 head. Ventrals falling far short of anal. Dorsal spine slender. 



