FISHES OF THE PHOENIX AND SAMOAN ISLANDS 245 



PERIOPHTHALMUS KOELREUTERI (Pallas) 



Oobius koelreuteri Pat.tas, Spicilegia zoologica . . ., fasc. 8, p. 8, pi. 2, figs. 

 1-3, 1770. 



52214, Apia, Samoa, Jordan aud Kellogg, 12 specimens. 

 52222, Pago Pago, Samoa, Jordan and Kellogg, 12 specimens 

 41565, Samoau Islands, Dr. C. H. White, 7 specimens. 

 76267, Apia, Samoa, Jordan and Kellogg, 1 specimen. 



Family ELEOTRIDAE 



KEY TO THE SPECIES OF GOBIES WITH SEPARATED PELVIC FINS (THE INNER 

 RAYS NOT JOINED BY A MEMBRANE EVEN AT THEIR BASES) AND WITHOUT 

 A DEVELOPED BASAL MEMBRANE ON PELVICS 



la. Pelvic fin rays definitely I, 5. 

 2a. Margin of preopercle without spines. 

 3a. Body compressed, dorsal surface of snout aud iuterorbital space scaly; 

 interorbital space as wide as or a little wider than eye or snout ; 

 maxillarii's not reaching to front of eyes; giil rakers 5+12 or 13; 

 tongue truncate ; nape, cheeks, opercles and breast scaled ; teeth 

 in a villiform band in both jaws; dorsal rays VI-I, 8 or I, 9; anal 

 I, 10 or I, 11 ; pectoral about 13 ; scales 26 to 29 ; caudal fin a little 

 rounded ; black band along midaxis of body ending in a black spot 

 at base of caudal fin a little below midaxis. 



Hypseleotris cyprinoides (Valenciennes) 

 36. Body not especially compressed ; dorsal surface of snout in front of 

 eyes not scaled; maxillaries reaching to at least front of eyes. 

 4a. Interorbital space much wider than diameter of eyes; scales small, 

 numbering about 48 to 77 rows from gill opening to base of caudal 

 fin (see table 28 for counts) ; dorsal rays VI-I, 8; anal I, 8; cheeks, 

 opercles, nape, and breast scaled ; no median pore located in the 

 interorbital space ; head about 3 in standard length ; teeth in villi- 

 form bands in both jaws. 

 5«. Scale rows 49 to 53 ; 14 or 15 scales in transverse row ; about 31 to 

 36 predorsal scales; pectoral rays 16; pelvic rays not reaching 

 to anus and 1% in head; interorbital space shallowly concave; 

 snout bluntly rounded ; maxillaries reaching to under middle of 

 pupils ; three blackish lines extending backward and ventrally 

 from eyes; background color brown speckled with black. 



Eleotris melanosoma Bleeker 



56. Scale rows 64 to 66 ; 17 or 18 in the transverse row ; about 44 



predorsal scales ; pectoral rays 17 or 18 ; pelvics not reaching to 



anus 1^2 to 1% in head; interorbital space shallowly concave; 



snout bluntly rounded ; maxillaries reaching to below middle of 



pupil; color brown Eleotris fusca (Bloch) 



46. Interorbital space about as wide as diameter of eyes to much narrower 



than diameter of eyes and always narrower than length of snout. 



6a. Scale rows distinct and fewer than 35. 



7a. Gill membranes broadly attached to the isthmus ; scale rows about 



32; sides of head with prominently raised ridges of pores or 



papillae ; nape, opercles, and breast scaled ; cheeks with a few 



scales dorsally ; lower jaw longer, gape of mouth oblique; tongue 



rounded, a villiform band of teeth in each jaw, the outer ones 



enlarged; dorsal rays VI-I, 9; anal I, 8; pectoral 17; 12 or 13 



