148 The Philippine Journal of Science 1915 



of the spine on the merus of the third legs is evident in this 

 series in passing from the old males to the younger males. Be- 

 fore having seen von Martens's paper, I had come to the con- 

 clusion that I vi^as dealing with the young and old of the same 

 species, which increases the value of my confirmation of von 

 Martens's observation. 



The exceptionally large third legs are characteristic only of 

 the old males in our specimens. In the females the third legs 

 are always a little larger than the fourth and fifth, but they 

 never approach the size found in the large males. Furthermore 

 the large heavy spine is not present in the females, but in its 

 place there are the slender acute spines similar to the ones which 

 are found in the young males. 



A comparison of 7 specimens, the largest 70 millimeters and 

 the smallest 25 millimeters in length, shows interesting grada- 

 tions in the size and character of the spines on the third, fourth, 

 and fifth legs. 



Specimen 1 (museum No. 1380) is an old male, 70 millimeters 

 in length, with 3 teeth on the ventral border of the rostrum. 

 The right third leg has a large immovable spine on the ventro- 

 lateral surface of the merus near the distal end. The merus of 

 the right fourth leg has 1 slender movable spine almost ventral 

 in position and near the distal end. The merus of the right 

 fifth leg has 2 slender movable spines which are ventral in 

 position, one being near the distal end and the other at about 

 the middle. The conditions are similar for the left legs, except 

 that on the merus of the fifth leg there is no spine in the 

 middle region (fig. 1, a, b, c) . 



Specimen 2 (museum No. 1371) is a slightly younger male, 

 56 millimeters long, with 5 teeth on the ventral border of the 

 rostrum. The merus of the right third leg has 1 large im- 

 movable spine, smaller than the spine in specimen 1, on the 

 ventrolateral surface near the distal end. The merus of the 

 fourth leg has 2 slender movable spines, one near the distal end 

 and the other about one third of the length of the merus poste- 

 rior to the distal end. The merus of the fifth leg shows 3 slender 

 movable spines, the most posterior being two thirds of the length 

 of the merus posterior to the distal end. The conditions are 

 similar for the left legs (fig. 1, d, e, /). 



Specimen 3 (museum No. 1371) is 58 millimeters long and 

 has 4 teeth on the ventral border of the rostrum. Although 

 this specimen is 2 millimeters longer than specimen 2, its third 

 legs are not so heavy, and I consider it to be less mature. The 

 merus of the right third leg bears 2 spines — a heavy immovable 



