ORTHOPTERA. 



49 



la 4:" bifurquee pres de Tapex ; nervules transverses assez nombreuses, irre- 

 gulieres ; champ lateral comme chez le male, mais la 3® nervure un peu moins 

 sinuee. Ailes comme celles du male. 



Long, totale 13-5 mm. ; long, du corps 7-5 mm. ; fem. post. 6-5 mm. ; 

 elytres 6-5 mm. ; oviscapte 3 mm. 



Cette espece est remarquable par sa coloration brun sombre uniforme, par 

 ses elytres un peu pubescent et par les epines des tibias posterieurs longues et 

 pubescentes.* 



Eneopterinae. 



50. Cardiodactylus novae-guineae Haan. 



Platydactylus novae-guineae Haan, Temninch Verliandl. Orth., p. 233, 1842. 



Cardiodactylus novae-guineae Saussure, Mem. Sac. Geneve, xxv, p. 519, 1878 ; Holdhaus, loc. cit., 



p. 550, 1908. 



Upolu : Apia, ii.l924, 2 ^ ; iii.1924, 1 $ ; iv.l924, 1 c^, 1 $ ; xii.1922 

 (Armstrong), 2 $ ; Aleipata, iv.l924, 1 



Tutuila: Pago Pago, xi.l925, 1 S\ xii.1925, 1 (J, 1 $ ; ii.l924 (Bryan), 

 1 Vaitogi, ix.l923 (Swezey et Wilder), 2 1 



Savaii: Safune, ii.l924 (Bryan), 1 ^ ; rain forest (2,000-4,000 ft.), v.1924 

 (Bryan), 1 $ ; Salailua, v.1924 (Bryan), 1 ^\ Fagamalo, xi.l925, 1 ^. 



Manua : Ofu, ii.l926, 1 Tau, ii.l926 (Judd), 1 



Tonga : Vavau, Haloga, iv.l925, 1 ^. 



Gen, Swezwilderia, gen. n.f 



Genre voisin de Cardiodactylus, mais les elytres du male sans miroir, a nerva- 

 tion semblable a celle de la femelle. 



The torrential mountain streams in the neighbourhood of Malololelei are the habitat of this 

 interesting species. A. hopJcinsi is found sitting on the boulders, generally on the down-stream 

 side, close to the surface of the water, where their dark colour renders the insects extremely 

 inconspicuous. When pursued they fly readily, and in flight resemble large Perlidae. They also 

 jump on to the surface of the rapidly running water and swim over it very skilfully, but they were 

 never seen to submerge themselves. The development of long pubescent spines on the posterior 

 tibiae is perhaps an adaptation which facilitates swimming over running water. It recalls the 

 structure of Hydropedeticus vitiensis, which lives in similar torrents in Fiji (see Miall and Gilson, 

 Trans. Ent. Sac. Lond., pp. 281-285, 1902). The streams where A. hopJcinsi is found are no more 

 than a dozen yards across, but in spite of this the insects seem to be entirelyiconfined to the boulders 

 in the water, and to avoid those which lie strewn on the bank. — P. A. Buxton. 

 t Genre dedie a MM. Swezey et Wilder. 



