158 FAUNA HAWAIIENSIS 



(i) Microvelia vagans, F. B. White. 



Microvelia vagans F. B. White, 187S, Ann. Mag. Nat. Hist. (5) i. p. 374. 



This beautiful Httle species may be distinguished by the antennal proportions, viz. : 

 first segment about one-third longer than the second, which is about one-seventh shorter 

 than the third, fourth twice as long as second. The posterior tibiae are destitute of long 

 bristly hairs, the head is immaculate (except for the silvery lateral pubescence), the 

 pronotum not carinate and the posterior femora unarmed. 



van One apterous specimen has the head very widely fulvous. 



I have seen the type (Perth Museum); and eight other examples (including 

 apterous forms). 



Hab. " Not uncommon on running water" (White). — Oahu, N. W. Koolau range 

 (May, July); Lanai, 2000 ft. (December), Perkins. 



Halobates Eschscholtz. 



Halobates Eschsch., 1823, Dorpat Naturw., Abh. i. p. 163 (Entomogr. i. p. 106); 



F. B. White, 1S83, Voy. Challenger, Hemipt. p. 23. 

 A cosmopolitan pelagic genus. It is recorded from the Oligocene, but this almost 

 certainly refers to Metrobatcs or allied freshwater genus. 



(i) Halobates sericeus, Eschsch. 



Halobates sericeus Eschsch., 1823, Dorpat Naturw., Abh. i. p. 165 ; F. B. White, 

 1883, Voy. Challenger, Hemipt. p. 47, PI. i. fig. 7. 



Hab. Oahu, near Honolulu (Mus. Bremen) ; distributed all over Pacific Ocean 

 from Japan to San Francisco and from Cape Horn to the Hawaiian Isles, but less 

 abundant on the South Pacific ; North Atlantic Ocean at Cape de Verde. March, April, 

 June, July, October (probably all the year round). Not taken by Mr Perkins. 

 [Recorded also from Madagascar and Cape of Good Hope, but possibly in error.] 



[(2) H. gennanus White, 1883, Voy. Challenger, Hemipt. p. 50, PI. i. fig. 6, will 

 probably also be found off the coasts of our group.] 



Earn. PYRRHOCORIDAE 



( = Lygaeidae -1- Pyrrhocoridae auctt.) 



Subfam. PYRRHOCORINAE. 



AsTEMM.A. Lep. Serv. 



Astemma Lepeletier St Fargeau and Serville, 1825, Enc. Meth. x. p. 323. 

 Dysdercus Am. Serv., 1843, Hemipt. p. 272. 



