416 CALIFORNIA ACADEMY OF SCIENCES. 44 



seum at Paris, we have received a drawing of this speci- 

 men. In the drawing- the lower jaw, from tip of upper, 

 is i^ times length of head. The head, with lower jaw, 

 is 1 1 times in length from tip of upper jaw to base of 

 caudal. The ventral is midway between front of eye and 

 base of caudal. The name roberti belongs, therefore, to 

 the common long-jawed form; the short-jawed West In- 

 dian form being HyfiorJiamphus, unifasciatus. 



Family SYNGNATHIDvE. 



58. Siphostoma starksii Jordan & Culver, n. sp. Cul- 

 evra de Rio. Plate xxx. 



Common in the Rio Presidio in sluggish water, on the 

 bottom, about a mile below the village of Presidio. The 

 species is probably found in brackish and fresh waters 

 rather than in the sea. 



Head io}4 ; depth 21; dorsal 38, on o-j-10 or 11 

 rings. Rings 13 or 14-J-37 or 38. Head and body in 

 tail 2. Snout i\ in head. Dorsal half longer than head. 



Body rather stout. Head scarcely carinate above. 

 Snout with a slight smooth carina. Two lateral keels, 

 confluent into one behind. 



Belly slightly keeled; no keel on opercle. 



Color, dark olive, much mottled with darker but with- 

 out distinct markings; yellow below. 



Male and female common in the fresh waters of Rio 

 Presidio among algae; not seen in salt or brackish water. 

 The pouch of the male teeming with eggs in January. 



Length 4 to 6 inches. 



Type, No. 2686, L. S. Jr. Univ. Mus. 



59. Siphostoma arctum Jenkins & Evermann. 



Two specimens taken in the Astillero at Mazatlan, both 

 males, the egg-pouch filled with eggs. Length 4 inches. 

 Previously known only from Guaymas. This species re- 



