FISHES OF SINALOA. 5II 



19. Xystaema cinereum (Walbaum.) 

 Common. About twenty specimens obtained. 



20. Gerres lineatus (Humboldt). 

 Common. 



21. Scarus perrico Jordan & Gilbert. 

 One specimen, found dead on the beach. 



22. Spheroides lobatus (Steindachner). 



Common. Two specitnens obtained. In color these 

 approach Spheroides augiisticefs (Jenyns). It may be 

 that lobatus is, after all, the young of augiisticeps, as 

 was supposed by Jordan and Gilbert. 



23. Diodon holacanthus Linnaeus. 



Common. One specimen, 11 inches long, was obtained. 



D. 12; A. 12; back and sides covered with spots; no 

 spots on fins or tail; back very dark; a dark band be- 

 tween eyes; frontal spines nearly as long as pectoral 

 spines which are longest. 



24. Alexurus armiger Jordan, n. g. and sp. Gobiid^. 

 Plate xlviii. 



Head 4^; depth 8; dorsal VI-13; anal 11; V. I, 5; 

 scales about 102-30 ; eye 8 in head; maxillary 2^ ; man- 

 dible 2}^ ; snout 5^ ; interorbital 4//^ ; pectoral if; cau- 

 dal equals head; ventral 2; last dorsal ray i-f. 



Body long and low, compressed posteriorly, depressed 

 in front. Head flattish and broad above, the cheeks mod- 

 erately tumid. Eyes small, high up, separated by a broad 

 flattish interorbital space; snout short; mouth moderate, 

 very oblique, the maxillary ceasing below the center of 

 pupil; lower jaw very heavy, oblique, projecting beyond 

 upper, its outline horseshoe-shaped, obtuse in front. Teeth 

 in rather broad bands, the outer enlarged below, but 



