ix, d, 4 Cowles: Palaemons of tke Philippine Islands 389 



at hand if the two chelipeds ever become more nearly alike in 

 older individuals. 



The tip of the telson is acute, but the lateral spines are worn, 

 and some of them are absent from the specimen under considera- 

 tion. In another male specimen with a more perfect telson the 

 externolateral spines are very short and the internolateral spines 

 extend beyond the tip of the telson with one-half of their length. 



The carpus, abdominal segments, and uropods are smooth, 

 but the second, third, fourth, and fifth legs are well covered with 

 heavy spines. In general, the spines are much like those of 

 Palaemon lepidactylus Hilgendorf, except that there are no con- 

 ical spines on the superior 45a and inner surfaces of the palm 

 of the cheliped and that in the place of these there are pointed, 

 flattened spines, whose upper surfaces are concave and whose 

 lower surfaces are convex. Also, these spines are found on the 

 fingers as in the case of Palaemon lepidactylus Hilgendorf. 

 "Linear spaces" are present on the palm, carpus, and merus of 

 both chelipeds. 



The third, fourth, and fifth legs are stout in comparison with 

 those of most other palaemons. There is little difference in the 

 length of these legs ; the fifth is the shortest. One-third of the 

 propodus of the third leg and the tip of the dactylus of the fourth 

 leg extend beyond the tip of the antennal scale, but the fifth leg 

 extends only slightly beyond the tip of the peduncle of the second 

 antenna. The propodus of the fifth leg measures 9 millimeters 

 in length and 1.1 millimeters in diameter at its middle point. 



The two females listed in Table VII are the only perfect ones 

 in the collection. The right and left chelipeds in each specimen 

 are nearly the same in size and shape. No distal teeth are pres- 

 ent, but there is a well-developed keel on the cutting edge of 

 both fingers, and this keel is partially concealed by a sparse 

 growth of hair. One female, which is not listed in Table VII, 

 carries eggs, and the measurements of these average 0.7 by 0.5 

 millimeter. 



The 18 males and 5 females of this new species were taken in 

 Hibucawan River, near Jaro, Leyte, by Alvin Seale and Urbano 

 Villamor. 



Palaemon lepidactylus Hilgendorf. Plate III, figs. 9 and 9a-b. 



A rare species known as Palaemon lepidactylus Hilgendorf is 

 represented in our collection by 2 male specimens. Both indi- 

 viduals are rather small, and one has the chelipeds missing ; the 



45 a That is, the border which is continuous with the immobile finger. 



