Report of a Mission to Guam. 119 



inconspicuous. Back compressed into a ridge. Bones of the upper 

 and lower jaw in the form of a beak, with cutting edge. A median 

 suture present. Fins: Longest dorsal ra}- equal to longest anal ray, 



2 into head; longest ray of caudal 3 into length of fish; the space 

 between the hind margin of dorsal and the base of caudal 4 into 

 length. Color in spirits: Above, a sepia brown covered with blue 

 spots with black edges ; these spots thicker and smaller than 

 pupil, on the posterior half ; on the sides of head the spots are 

 as large or larger than the pupil ; several short radiating blue 

 lines about eye; three or four across interorbital space. Older 

 specimens have blue lines over the snout and on sides of the mouth. 

 Under parts yellowish white with a median blue line on belly to 

 anal in larger specimens. A black spot, a little larger than e\-e, 

 covering the base of dorsal. Pecflorals, anal and dorsal fins yellow- 

 ish white. Caudal dusky yellow with numerous blue lines and 

 dots. Six specimens, i .25-3 inches in length, were taken at Agaiia, 

 Guam, inside the coral reef, July 12, 1900. These fish are usually 

 found in pairs swimming about the coral reef; it is even difficult to 

 frighten them so the two will separate, and when this is accom- 

 plished they seem to invariably join the same partner again. Hab. 

 Polynesia, Marianas. 



250. Tetrodon reticularis Bl. 



Voioig-.- Head 2.50; eye 3.50; caudal rays 4 into length of fish 

 and equal to distance from caudal to anterior base of dorsal: pec- 

 torals 2 into head; small spicules all over except at base of caudal; 

 interorbital 3.50 into head. Color: Back, head and. cheeks brown, 

 with scattered blue spots. Two blue concentric lines below eye. 

 Base of pecflorals black with one or two concentric bluish rings. 

 Belly yellowish w^hite with about 18 longitudinal brown lines about 

 three times as wide as the interspaces. Caudal dusk}-. Pectorals, 

 dorsal and anal ^-ellowi.sh. One specimen, a young, 1.50 inches in 

 length, was the only representative of this species .secured. Agaiia, 

 Guam, July 12, 1900. Hab. Western Pacific, Marianas. 



251. Tetrodon immaculatus Bl. 



Young: Head 2.33; e^-e 3.50 into head; length of caudal ra}- 



3 into head; pecftorals 3; interorbital 3 into head. Color in spirits: 

 Brownish above with about 8 oblique narrow black lines extending 

 up and back from vicinitj^ of pectorals to caudal and dorsal; below 

 yellowish white, unstreaked. Caudal dusky, with black upper and 

 lower margins. Pe(5lorals, anal and dorsal white. One specimen, 

 length 1.50 inches, taken at Agaiia, Guam, July 12, 1900. Hab, 

 Polynesia, Marianas. 



252. Tetrodon stellatus Bl. 



Yoiins;: Head 2.50; eye 3; interorbital 4; caudal ra3-s 3.50 

 into length; pecftorals 3. Color: x\lmost a lamp-black above, un- 



