5o8 FA UNA HA WAIIENSIS 



( I ) Hap to lie lis tetragonus, Murray. 



Haptoncus tetragonus Murray, Mon. Nitid. p. 401, pi. .xxxiii. f. 7. 

 When quite immature the black spots may be absent, but the sculpture and shape 

 prevent these examples from being mistaken for the unspotted H. niiindus. 



Hab. Oahu, Lanai, Hawaii, Kauai. — Oahu ; Kaala mountains. — Lanai ; mts. 

 Koele. — Hawaii; Kona. (Perkins.) — Kauai (Blackburn). 



(2) Haptoncus luiauins. Sharp. 

 Haptoncus mundus Sharp, Tr. ent. Soc. London, 1878, p. 139. 



H.AB. Oahu, Hawaii, Kauai. — Oahu (Blackburn); Waialua (Perkins). — Hawaii 

 (Blackburn); above Hilo, 1800 ft. (Perkins). — Kauai (Perkins); a small dark variety 

 recorded by Blackburn from this island (Tr. Dublin Soc. iii. 1885, p. 231). Blackburn 

 records it as taken "on flowers of forest trees on the mountains" and generally 1500 — 

 3000 ft. above the sea. Mr Perkins' collection contains eight specimens. 



Fam. HISTERIDAE'. 



This family is represented in the Hawaiian Islands by four genera. The species 

 of two of these, Carcinops and Saprinus, are undoubtedly introduced. With regard to 

 the third genus, Bacanius, it is not possible to say whether the species belonging to it 

 are also introduced, or whether they belong to the truly native fauna. The species of 

 the fourth genus, Acritns, with one possible exception almost certainly form part of 

 the indigenous fauna. Except in the case of the one point mentioned below, questions 

 relating to them are discussed under the heading of that genus. 



Reduction of Wings. Out of the 2,2, species of Acritns belonging to the division 

 of the genus in which there is no visible scutellum, two species (/4. longipes and its van 

 ha/eakaiae, and A. subalatus) have been shown to have the wings greatly reduced. 

 Smallness of material has prevented a thorough investigation of this phenomenon, and 

 although the reduction has been proved in five specimens altogether, in only one 

 specimen has it been possible to obtain the reduced wing in a perfect condition. Of 

 the other 31 species, 14 have been shown to have the wings not reduced; but here 

 again smallness of material and the fact that it is almost impossible to study the wings 

 without entirely removing one or both elytra have been a hindrance, and in only one 

 case l^A. subbasa/is, q. v.) has an examination of more than one specimen been possible. 

 In the remaining 17 species of this section of Acritns, in the one species belonging to 

 the other section, and in the other genera, the wings have not been seen. 



In the descriptions of the Bacanii diXxA Acriti, it is in each case mentioned whether 



' By Hugh Scott. 



