240 BULLETIN 180, UNITED STATES NATIONAL MUSEUM 



Genus MAHIDOLIA H. M. Smith 



MahidoUa H. M. Smith, Journ. Siam Soc. Nat. Hist., Suppl., vol. 8, No. 4, 

 p. 255, 1932. (Type, MahidoUa normani Smith and Koumans, in Smith.) 



MAHIDOLIA PAGOENSIS, new species 



FiGUKE 20 



Holotype. — A specimen (U.S.N.M. No. 116113) 15.7 mm. in standard 

 length, collected by Leonard P. Schultz, June 2, 1939, in a stream at 

 the village of Pago Pago, Tutuila Island, along with two paratypes 

 (U.S.N.M. No. 116114) bearing same data. These types were col- 

 lected among small stones and debris within 75 feet of the mouth of 

 the creek that flows into Pago Pago Bay. 



Descriptimi. — (Based on the holotype and two paratypes. All 

 measurements are recorded in hundredths of the standard length, 

 15.7 (13; 16.6 mm.). Counts and measurements for the holotype are 



Figure 20. — MahidoUa pagoensis, new species: Holotype (U, S. N. M. No. 116113), 

 15.7 mm. in standard length. 



given first, followed by those for the paratypes in parentheses, respec- 

 tively.) Length of head 33.0 (31.6; 31.2) ; greatest depth 22.2 (21.5; 

 21.0) ; diameter of eye 8.3 (8.5; 8.4) ; distance from tip of snout to 

 rear edge of maxillaries 21.0 (19.2; 21.0) ; length of snout 5.7 (5.4; 

 6.6); postorbital length of head 17.8 (18.4; 16.9); least width of 

 preorbital 1.3 (1.5; 1.2) ; length of caudal peduncle 24.2 (25.4; 25.8) ; 

 width of caudal peduncle 10.2 (10.0; 10.8) ; tip of snout to origin 

 of dorsal fin 38.2 (40.0; 36.8) ; snout to origin of anal fin 61.0 (60.7; 

 61.0); snout to anus 56.0 (57.2; 56.6); longest (first and second) 

 spines of dorsal 17.8 (19.2; 19.9); longest (last) ray of soft dorsal 

 21.0 (25.4; 24.7); longest (last) ray of anal fin 21.0 (25.4; 21.7); 

 longest (middle) ray of caudal fin 28.6 ( — ; 30.2) ; longest pectoral 

 fin ray 24.2 (20.2; 24.0) ; longest pelvic fin ray 24.2 (29.2; 4.1). 



Dorsal fin rays VI-I, 7 (VI-I, 8; VI-I, 7) ; anal rays I, 6 (I, 6 

 I, 6) ; pelvic rays I, 5 (I, 5; I, 5) ; pectoral rays 16-16 (17-16; 16-16) 

 number of scale rows from gill opening to base of caudal fin 26 (25 

 25) ; number of scales in the transverse row from front of soft dorsal 

 fin to anal fin 7 (7; 7) ; number of scales in front of dorsal 7 (8; 7). 



