TWO NEW SPECIES OF ONYCHOPHORA. 485 



found in the species Horsti. There is a dark line along the 

 middle of the back, as in the Malay forms. The line in 

 question is due to the greater development of pigment in the 

 papillae situated on either side of the non-pigmented but 

 narrow line which occupies the mid-dorsal position, as in the 

 Malay species. The segmentally arranged areas situated on 

 the ventral surface in the species from the peniusula are 

 scarcely visible in the Sumatran form, although, having pre- 

 viously seen them in the former, I was able to find traces of 

 them in the latter. 



The mouth, genital orifice, and the anus are situated in the 

 same position, and have the same structure as in E. Horsti. 

 Between the genital orifice and the anus, i. e. between the 

 last pair of legs, is found the common opening of the male 

 accessoi'y glands. This opening was mistaken by Dr. Horst 

 for the anus, which is a small longitudinal slit situated very 

 slightly subterminal. 



The antennee have the same shape as in the Malay species, 

 and very nearly the same number of rings, although some of 

 these are small and consequently very difficult to count. It 

 seems that there are in all about fifty or fifty-one rings. 



The disposition of the legs, of which there ai*e twenty-four 

 pairs, is practically the same as in the species Horsti. The 

 distance between the successive pairs in the anterior part of the 

 body is not much greater than that between similarly situated 

 pairs in the posterior part. There are four ci'escentic pads 

 on every leg of the first twenty-two pairs, the penultimate 

 pair having only three, and the last only two on each leg. 

 The crural grooves are all closed, but are easily made out on 

 all the legs except the last two pairs, though they are smaller 

 on the three anterior pairs. On the last two pairs of legs 

 in the species sumatran us there is no sign of the papilla3, 

 which are supposed to represent the whitish lips of the 

 reduced crural grooves. 



The feet in E. sumatranus have the two papillae found 

 in Weldoni and Horsti. The two distal papillag, one in 

 front and one behind, are divided into two parts, the top 



