420 C. SKOTTSBERG 



Tetramorium guiuecnse Fabr. Probably of African origin, now pantrop.; in 

 hothouses in the temp, region. 



T. siniil/iuiioH F. Smith. As the former. 



Plagiolepis niactai'ishi Wheeler. Formosa, Hawaii, Society Is. 



Prenolepis hourbojiica Forel subsp. Skottsbergi Wheeler. The typical species 

 known from Chagos, Nicobar and Seychelle Is., and E. Afr., Pemba I. Other 

 subspecies in Ind., Comoro Is., E. As., Philipp. Is. and Hawaii. 



Ants are easily carried about by man, but it seems likely that Piaster Island 

 also has indigenous forms. 

 Vespidae (206). 



Polistes Jiebraeus F. \i. Afr., Madag., Ind., China; Tahiti? 



Hemiptera (21). 



Clerada apicicoiiiis Sign. Wide-spread, introduced. 

 Redui'iolus capsiformis Germ. As the former. 



Mollusca {i8g). 



Umax arboruDi Bruch-Chant. Cosmop., introduced. 



Milax gagates Drap. As the former. 



Melampiis philippi Kuester. Peru. 



+ J/. pascus Odhner. The genus distributed over the Pacific from Hawaii 

 to N. Caled. S. Amer. 



Tor7iatellbwps nnprcssa Mouss. (Syn. Pacificella variabilis Odhner I.e.). Dis- 

 tributed from P^iji to Easter Island. Perhaps introduced with living plant material. 



The fauna, as known hitherto, presents the same picture of extreme poverty 

 as the flora, and even if future researches will double the number of species and 

 reveal the occurrence of groups not yet recorded, a considerable portion will con- 

 sist of late immigrants. The known endemics are very few and one or two of 

 them questionable, and our experience from the old list of Juan P'ernandez Diptera 

 (S4) bodes no good for the single endemic genus. Altogether half a dozen en- 

 demic species and some endemic forms of lower category have been described, 

 and of the species found elsewhere some are, perhaps, indigenous. An example 

 of remarkable discontinuous distribution is offered by Melanozosteria pJiilpotti, 

 New Zealand and ICaster Island ; possibly it will be discovered in intermediate 

 stations, but such stations are difficult to find in other cases where Piaster Island 

 is the terminus: Anisolabus BovDiausi, Galapagos Islands -f Juan P^rnandez, C/iry- 

 sopa lajiata. South America and Hawaii, Poiicra trigo)ia, America, and llaplotJirips 

 7U)tatus, Hawaii. A direct overseas transport is not very probable, and I cannot 

 tell if these animals are likely to have been introduced with the traffic. 



