392 The Philippine Journal of Science isu 



and the tip of the dactylus of the fourth leg extend beyond the 

 tip of the antennal scale, but the fifth leg barely reaches it. 

 The propodus of the fifth leg measures 7 millimeters in length, 

 and at its middle point it is 1 millimeter in thickness. 



Both specimens are males; they were collected in a small 

 mountain stream near Sisiman, Bataan Province, Luzon, by 

 Tomas Banguis. 



Palaemon latidactylus Thallwitz. Plate III, figs. 10 and 10a-/i. 



This species is represented in our collection by 2 young mature 

 male specimens (Nos. 1087 and 1484) 4G from the region of 

 Manila, which agree very well with Thallwitz's " 7 original de- 

 scription and with the description of de Man. 48 There are also 

 2 male specimens (Nos. 73 and 128), collected in the region of 

 Manila, which I believe belong to the same species but which 

 I consider to be "males feminises;" 2 females (Nos. 371 and 593) 

 from the Manila water supply; 1 male (No. 1485) from the 

 Manila water supply, which I hesitate to include under this 

 species; 2 specimens (Nos. 1499 and 1500), one of which is an 

 old male and the other a young male from Jaro, Leyte; 3 

 specimens (No. 1451) from Agusan River, Mindanao; and a 

 young mature male (No. 71) from Samar, which differs only 

 slightly from Thallwitz's original description. 



I believe, as do Thallwitz and de Man, that the specimens 

 from Manila diagnosed by von Martens 49 as Palaemon grandi- 

 manus Randall are probably identical with Palaemon latidactylus 

 Thallwitz. On the other hand, it is very questionable if von 

 Martens's Manila specimens belong to Randall's Palaemon grandi- 

 manus. Miss Rathbun's notes on Randall's type specimens and 

 her photographic reproduction of an old male from the Honolulu 

 market indicate that von Martens's Manila specimens belong to a 

 different species. 50 The following description applies to an old 

 male (No. 1484) collected from the settling basin of the Manila 

 water supply : 



It is 66 millimeters in length (carapace 20.5 millimeters), 

 and the rostrum extends to the tip of the peduncle of the first 

 antenna. There are 16 teeth on the dorsal border of the rostrum, 



46 In this description the numbers referred to are museum numbers. 

 " Abhandlungen und Berichte des Koniglichen Museums zu Dresden 

 (1891), 17. 



48 Abh. Senckenbergischen Naturforsch. Ges. (1900), 25, 802. 



''Arch. f. Naturgesch. (1868), 34, 45. 



"Bull. U. S. Fish Comm. (1903), 23, pt. 3, 923. Published in 1906. 



