782 



PROCEEDINGS OF THE yATloXAL MUSEUM. 



Bod}' as ])road as deep; caiulul pcduiule ver}- slightl}^ compressed, 

 luit appearin«>* perfectly round; no caudal keel. Interorl)ital space 

 slightly wider than eye, and flatter than in T. scapu/aris. The longi- 

 tudinal channel little evident, and behind eye scarcely sunk below gen- 

 eral level of top of head. In the latter species (two specimens from 

 Panama) the top of head bears a deep groove which extends ))ack 

 nearly to opposite middle of cheek, where it terminates rather abruptly. 

 Scales on cheek nuicli smaller than in T. !<capuhirLs as shown in accom- 

 pany in g figures; in :^1 or 22 irregular rows counting longitudinally, 

 and a])pt'!uing scarcely more than half as large as in the latter species, 

 which has about 15 irregulai' rows on clicck. 



Fk;. Ci.— Tylosurus .iorpani. 



Pectoral contained i^ ii. postorbital part of head. Ventrals inserted 

 one diameter of eye near(>r base of caudal than posterior margin of 

 eye. Front of dorsal o\ei" base of iifth anal ray; tip of last anal ray 

 reaching to below base of next to last dor.sd ray. Caudal slightly 

 lunate; the lol)es rounded; lower lobe considerably longer than upper. 



Color as in 7\ ■"<('(( p uh a ' is ^ but everywhere darker. Under parts 

 little lighter than sides and back. Fins all dusky; a dark scapular 

 spot i)rescnt. No trace remains of a silvery lateral band, but occu[)V- 

 ing the same region is a dark bluish band that is very indefinite. The 

 specimen was })reserved in formalin and if it had any silvery color it 

 was destroved. . • .. 



Fi<i. 7.— TYi.osriifs scAin'i.Aius. 



This species is close to 7. .v(v/^y//A//'/,s* Jordan and (rilbert. ])ut diti'ers 

 in having smaller sirales, particularly those on cheek, and scarcelj^ any 

 interorbital groove. From 7\ ffnr/afili.s (Regan) it differs in having 

 fewer fin I'ays, more posterior insertion of the ventrals, and the inter- 

 orbital space greater than the length of the eye. T. jJuviatllls has 15 

 or 10 dorsal rays and IT or 18 anal rays. 



The type and sole specimen is 87 cm. in liMigth and was collected at 

 Guayaquil, Ecuador. It is (l('))osited in th(> V . S. National MusiMun., 

 Cat.' No. 5;^,-l()!». 



1 tal<t' pl(>asur(' in naming tliis spcn-ies foi- Dr. Havid Starr Joiclan. 

 whose advice lirst made my study of ichthyology feasible. 



