70 



INSECTS OF SAMOA. 



tunity of studying the tyjies of these species. It is therefore impossible to 

 identify the species correctly, since the original descriptions are all insufficient 

 to distinguish one from another. For the time being, therefore, I have identified 

 them with three distinct species occurring respectively in the type localities. 

 A common Indian species, which is also widely distributed over the Malay 

 Archipelago, the Philippine Is. and Formosa, has been selected as probably 

 identical with L. fossarum (Fabricius) ; the only Tahitian species of which 

 there are examples in the British Museum has been regarded as representing 

 L. discolor (Stal) ; and a New Caledonian species has been identified as L. 



Text-fig. 2. — Ventral view of the genital segments of Limnogo7ms-s})ec\es, semi-diagrammatic. 

 a, Limnogonus luctuosus (Montrouzier), ; fe, $. c Limnogonus focificus Esaki, sp. n., ^ ; 

 d, e, Limnogonus fossarum (Fabricius), ^ ; f, 



luctuosus (Montrouzier). When the types of the species in question are 

 examined it is possible that some alterations will have to be made. Of these 

 three species, one occurs in Samoa. 



2. Limnogonus luctuosus (Montrouzier). Text-fig. 2, a, b. 



Gerris luctuosa Montrouzier, Ann. Soc. Linn. Lyon, xi, p. 242, 1864 ; Distant, Sarasin and Roux, 



Nova Caledonia, Zool., i, pt. 4, no. 10, p. 384, 1914. 



Upolu: Laulii, 1 21.1.1925. 



This species was hitherto only known to occur in New Caledonia. 



