110 Memoirs of the Indian Museum. [Vol. VII,. 



Gonatas carolinensis, n. sp. 



Fig. XVI, 3, p. 108. 

 Three specimens from the Caroline Islands. Length 22'4-23*2 mm. 

 This species differs from the last only in its smaller size, slightly longer antennal lamellae, 

 and more even mentum, the scars being less deeply impressed, especially medially. 



Gonatas minor, n. sp. 

 Fig. XVI, 4, p. 108. 

 Four specimens from Mefor (" Mafor ") and one from Eun (" Roon ") Islands. Length 



2I'3"22-2. 



The antennae are very long as in 67. germari. The difference in length between the 

 right and left mandibles is somewhat greater in 67. minor and in the next species than in 

 any other. The mentum resembles that of 67. germari ; its scars are less deeply impressed 

 than in 67. tenimbrensis , but more deeply impressed than in 67. carolinensis. The lateral 

 areas of the metasternum are smooth and hairless. In other respects the present species 

 resembles G. germari and 67. naviculator. 



Gonatas naviculator (Percheron). 



Fig. XVI, 5, p. 108 ; pi. I. 



Passalus naviculator, Percheron, 1844, pp. 1-2, pi. cxxxiv, fig. 1. 

 Gonatas naviculator, Kaup, 1871, pp. 50-51. 



Numerous specimens from Saparua Island, several from Ceram (Kairatoe in the 

 Western and Roemasosal-Pasama in the central part of the island) and Buano, one from 

 Nusa-Laut, and one said to come from New Guinea. Length 23*0-28-5 mm. 



67. naviculator can be distinguished from all other species of the genus known to me 

 by the strongly and as a rule abruptly curved posterior margin of the mentum, though this 

 character is not always so clearly marked in specimens from the mainland of Ceram as in 

 those from the neighbouring islands. The antennal lamellae are comparatively short and 

 stout as in 67. tenimbrensis, etc. The mandibles resemble those of 67. minor. The outer 

 tubercles are somewhat slenderer than in 67. germari, which the present species resembles 

 in other respects. 



The above-mentioned species of Gonatas may be identified thus : — 



The posterior margin of the mentum very lightly curved ; 



the scars more or less »-shaped . . . . . . . . . . 2. 



The posterior margin of the mentum more strongly curved ; 



the scars more or less W-shaped . . . . . . . . . . 4. 



The dentition of both mandibles complete and well developed G. minimus, p. 108. 

 The anterior lower tooth of the left mandible rudimentary or 



absent . . . . • • • • • • - . . . 3._ 



The antennal lamellae very slender ; the scars on the mentum 



distinctly »-shaped . . . . . . . . G. pumilio, p. 108. 



The antennal lamellae stouter ; the scars on the mentum 



intermediate between the w and W form, very deeply 



impressed laterally . . . . . . . . G. cetioides, p. 108. 



