Jordan and Evermann. — Fishes of North America. 1067 



it be from 7/Wt(j, to strain, and qtUhu, mouth ; erepog, different, and 

 aro/xa, -would make Heterostoma.) 



a. Lateral line complete (a few tubes very rarely wanting). 



b. Gill memliranes more or less broadly connected across the isthmus; ventrals separated 

 by a distinct interspace, which is not so wide as base of the fin; anal spines nor- 

 mally 2. 

 PVeciliciithys (TTotKiAo;, variegated; ix^s, fish): 

 c. Anal fin nearly as large as soft dorsal ; spinous dorsal with about 13 spines; head 

 almost naked; fins veiy large; colors brilliant. variatim, 1454. 



Nanostoma (i/ai'o?, small; (rro^ta, mouth): 

 cc. Anal fin much smaller than soft dorsal; spinous dorsal with 9 to 12 spines. 

 (I. Head entirely naked. 



e. Scales moderate, 48 to 57; pectoral yi^ longer than head; D. about XII-13; 

 sides with dark green spots. swannanoa, 1455. 



ee. Scales rather large, 40 to 48. 



/. Pectoral about as long as head; D. about X-11. 



(/. Head large, 3% to 4 in length ; sides with dark green blotches. 



THALASSINUM, 1456. 



yg. Head rather small, 4% in length; males with series of scarlet 



spots along the rows of scales. inscbiptum, 1457. 



jf. Pectoral much longer than head; D. XII-12; body robust; the depth 



43>2 in length ; color olive with dark oblique bars, blennids, 1458. 



dd. Head not entirely naked. 



h. Cheeks naked; opercles scaly; scales 50 to 60; body slender, the depth S% 



in length; color green, with darker markings. uipestre, 14.59. 



hh. Cheeks and opercles scaly (rarely naked); body slender, the depth 5 to 6 



in length. D. about X-11; pectoral about as long as head. 



i. Scales about 42; males with series of dark spots along the rows of 



scales. ELEGAN.S, 14G0. 



ii. Scales about 50; no distinct dark spots along series of scales. 



ZONAIE, 1461. 

 JSoTHONOTTjs (co3d?, prominent; fwro?, back): 



66. Gill membranes scarcely connected across isthmus; first dorsal long; anal rather 

 small; ventrals near together, the interspace very narrow. 

 j. Humeral region without enlarged black scale. 



li. Head short, the muzzle abruptly decurved; scales 50 to 58;lvertic»l fins black- 

 edged; breast blue in life. 

 I. Dorsal spines 11 or 12. rAMVRrM, 1462. 



U. Dorsal spines 14. vrLNEEATiM, 1403. 



M-. Head rather long and pointed, the snout not decurved. 



m. Scales rather small, 56 to 63; boily and fins variegated with red. 



n. Color olive; throat blue; sides in male with crimson spots and a 



brown, wavy, lateral band. D. XII-12. macui.atum, 1464. 



H». Color yellowish, with 4 dark bars; 10 to 12 oblong dark spots on 



sides; fins with red in male; D. XI-12. cineueum, 14C5. 



mm. Color greenish, with 8 to 10 transverse bluish bands; between each 



pair a bluish rhomb; a black caudal spot; fins with yellow. 



D_ XII-13. TESSELI.ATl'M, 1466. 



mm. Scales rather large, about 45; male olive with quadrate red siKJts on 

 sides; breast blue; belly orange; fins ornate; form robust. 



RUFILIN'KATUM, 1467. 



jj. Humeral region with an enlarged black scale; scales 43 to 55. D. X-11; color 



olivaceous, with 8 to 10 dark cross bars; form robust. jORnA.Nl, 1468. 



aa. Lateral line more or less incomplete (occasionally nearly or quite complete in jessiir and 



in sqnumk-eps); ventrals close together, the interspace very slight; first dorsal and anal 



rather small. 



