364 The Philippine Journal of Science 1914 



same in any one individual. It may range from green to blue 

 or even to brick red, and in old specimens these colors may be 

 partially obscured. No T-shaped, L-shaped, or diagonal mark- 

 ings are seen under the sides of the carapace, but in living speci- 

 mens the chelipeds are conspicuously marked, so as to appear like 

 tortoise shell (Plate II, fig. 3c). These markings, which are 

 probably the same as the marbled markings spoken of by de Man, 

 sometimes persist temporarily after preservation, but usually dis- 

 appear as do all other colors mentioned. The uropods are colored 

 a conspicuous red, and there is a purple spot on the postero- 

 lateral portion of the exopodite. The internal flagella of the first 

 pair of antennae are marked on their dorsal surface with bright 

 yellow, and similar yellow spots are also seen on the uropods 

 and telson. The color notes which have just been given apply 

 to both sexes, but there are certain markings which distinguish 

 the males from the females. A cream-colored transverse band 

 on the tergum of the third abdominal somite is present in all 

 the females of this species, but in the males it is much reduced in 

 size or almost absent. This band is found in some other species 

 which are described below. In the females the ventral border of 

 the pleura of the fourth and fifth somites has a blood-red color 

 which is absent in the males. 



Localities. — We have in our collection 73 females and 24 males. 

 Most of these were collected in Obando River flowing into Manila 

 Bay near Manila (brackish water) ; some were taken in San 

 Francisco River (usually fresh), which is a branch of Pasig 

 River; others were obtained from an estero (often brackish) 

 emptying into Pasig River within the city of Manila. Nos. 2, 

 6, 7, 9, 12, 17, 19, and 21 (Table III) are from San Francisco 

 River. 



Palaemon lanceifrons Dana. Plate II, figs. 4 and 4a. 



The collection contains several palaemons which agree well 

 with Dana's 39 description of Palaemon lanceifrons. The fingers 

 of the chelipeds are about equal to the palm in most specimens, 

 although in the old mature males (Dana's specimen was evidently 

 a rather old male) the fingers are considerably shorter than the 

 palm and are two-fifths of the length of the propodus. (Plate 

 II, figs. 4 and 4a.) The propodus is a little longer than the 

 carpus in all cases and a little slenderer. Characteristic tubercles 

 (not mentioned in Dana's description), teeth, and thick hair are 



"United States Exploring Expedition, Crustacea (1852-1854), 13, 589. 



