390 Records of the Indian Museum. [Vol. XVI, 



tion regarding M. convexus was derived from the posthumous 

 work of Stimpson, then unpublished. Perhaps Miss Rathbun 

 has since changed her opinion on the subject, for if the two 

 species are distinct the specimen from the Gulf of Siam recorded 

 by her as M. convexus should have been referred to M. inermis. 



Stimpson described M. convexus from a young specimen with 

 carapace "34 ins. in length and '59 ins. in breadth. I have ex- 

 amined a still smaller individual from the Andamans in which the 

 carapace is 6'5 mm. in length and 11 "4 mm. in breadth. Except 

 that the tooth on the merus of the last legs is absent, this specimen is 

 in almost exact agreement with Stimpson's description and figures. 

 I am convinced that it is an example of M. convexus and that this 

 species is based on a young specimen of M. inermis. 



Alcock recorded specimens from the Andamans ; additional 

 records are : — 



^\l^ Jack and I'na Is., Mergui Archipelago ' Investigator.' One. 



^^y Pamban, Ramnaddist., Gulf of Manaar. S. Kemp. Two. 



The Gulf of Manaar is the most western locality from which 

 the species has been recorded. Eastwards it extends to Australia, 

 Samoa, the Loo Choo Is. and the Hawaiian Is. 



Macrophthalmus erato, de Man. 



1898. Macrophtlialrmis erato, Koelbel, Wiss. Ergebn. Reise Grafen Bela 

 Szechenyi in Ostasien, II, p. 576, pi. i, figs. 13, 14. 



1900. Macrophtlialmus erato, Alcock, Jonrii. Asiat. Soc. Bengal, LXIX, 

 p. 381. 



1915. Macrophthalmus erato, Tesch Zool. Meded. Mus. Letdeii, I, p. 179, 

 pi. viii, fig. 0. 



This species was recorded by de Man and Alcock from the 

 Mergui Archipelago and Akyab ; it has since been found at the 

 following localities : — 



~~lo* Chandipur, near Balasore, Orissa. F. H. Gravely. Many. 

 ^^- Arakan coast. • Investigator.' One. 

 ^Yo~ Fisher Bay, Fori Owen, Tavoy. ,, Three. 

 ^^- Jack and Una Is., Mergui Archi- 

 pelago ... ... ... ,, Eleven. 



"f§^ Parker I., Mergui Archipelago ,, Two. 



The specimen from the Arakan coast is exceptional!}' large ; 

 the carapace is 17-4 mm. in breadth and 11 9 mm. in length. 



Outside the Bay of Bengal M. erato is known from Malacca 

 (de Man), the Gulf of Siam (Rathbun), Madoera near Java (Tesch) 

 and Hongkong (Koelbel). 



MacrophthaImu.s crinitus, Rathbun. 

 (Plate xxiv, fig. 7.) 



1915. Macrophthalmus crtiittus,Te9.ch, Zool. Meded. Mus. Leiden. I, p. IQ.?. 



Four small specimens from the Mergui Archipelago and Singa- 

 pore belong to this species. The largest male is 6*9 mm. in length 

 and 9"o mm, in greatest breadth of carapace. 



