132 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



the populations combined with a probable short pelagic larval stage 

 are the bases for continued separation. The present distribution of 

 the four species would favor a continental drift theory, wherein an 

 initially homogeneous single popidation was gradually broken up as 

 shorelines separated. 



Distribution (fig. 9). — Entomacrodus nigricans is restricted to the 

 rocky shores of the tropical-subtropical western Atlantic north of the 

 equator. It is found only at depths of a few centimeters to a meter 

 and, as noted by Breder (1948, as Salarichthys textilis), is a common 

 tide pool form. Specimens that I collected on the bottom in deeper 

 water (to 5 meters) were actually residents on rocks near the surface 

 of the water. The specimens had become incapacitated by rotenone 

 and had fallen to the bottom. I mention this because I have seen 

 collection data for Entomacrodus reporting occurrences as deep as 7 

 meters; I doubt that any species of the genus occurs naturally at 

 depths of much more than 1 or 2 meters. 



Material.— Bermuda: USNM 21936, 21944, 23802, 178367, 178738, 178834, 

 178967, 178968, 178969, 178970, 197668; south Florida: UMML 3011, 5704, 6647, 

 9872, 9939, USNM 116832; Bahamas: ANSP 81739, 81742, 81749, 81752, UF 

 8866, 8867, 8868, 8869, 8870, 8871, 9606; Cuba: MCZ 12513 (holotype of Salarias 

 margarilaceus), USNM 37534, 192201; Haiti: CNHM 72334, 72335; Dominican 

 Republic: BMNH 19.38.6.20.9; Puerto Rico: UMML 1776, UPR 130, 381, 724, 

 842, USNM 117410; Virgin Islands: UMML 2471, 3735, 5457, 6223; St. Martins: 

 UMML 6480; St. Eustatius: RMNH 18748; Antigua: USNM 178978; Dominica: 

 USNM 198279, 198280; Union Island: USNM 178424; Barbados: BMNH 

 1922.3.26.14, SU 32036, 32037, 37304, USNM 34625 (holotype of E. nigricans), 

 86745, 86746, 86749; Los Roques (Venezuela): USNM 195752, 195753, 195754, 

 195755; Venezuela: USNM 259156 F-1; Bonaire: RMNH 23579; Aruba: RMNH 

 23540, 23586; Curacao: RMNH 9820; Panama (Atlantic): MCZ 41492; Costa 

 Rica: CNHM 72359, LACM 2557; British Honduras: UMML 9981; Yucatan: 

 UCC (no number), UMML 9213, 9363; Cayman Islands: BMNH 1939.5.12.175; 

 Jamaica: CNHM 72326, 72327, LACM 5013. 5017, .5021; Serrana Bank: USNM 

 197324. 



Entomacrodus cau€lofasciatus (Regan) 



Plates 25, 26, 27 

 Salarias caudofasciatiis Regan, 1909, Proc. Zool. Soc. London, p. 405 [Christmas 



Island, Indian Ocean). 

 Salarias rarotongensis Whitley, 1965, Australian Zool., vol. 13, no. 2, p. 118 



[Rarotonga, Cook Islands]. 



Description. — Segmented dorsal fin rays 14-16 (table 63); seg- 

 mented anal fin rays 15-17 (table 63); posteriormost anal pterygio- 

 phore supporting 1 or 2 external elements (supporting 2 in 67-100 per- 

 cent of specimens depending on population) ; total gill-rakers on first 

 arch 13-18 (table 63); pseudobranchial filaments 5-8 (usually 6 or 7, 

 number not increasing with increase in SL) ; vertebrae 33-35 (34 in 93 

 percent of specimens) ; supraorbital cirri 1-8, increasing in number 



