382 FAUNA HAWAIIENSIS 



Itodacnus Sharp. 

 Itodacnus Sharp, Tr. DubHn Soc. in. 1885, p. 156. 



(i) Itodacmts coruscus, Karsch. 



Coryiubitci coruscus Karsch, Berlin, ent. Zeitschr. x.w. p. 5, V\. I. fig. 6. 

 We have not received any Itodacmts from the island of Maui, and I am not able 

 to say whether Karsch's coj-uscus is distinct irovn gracilis or not. 



Hab. Maui (Olinda, Dr Finsch). 



(2) Itodacnus major, sp. nov. 



Fusco-rufus, prothoracis marginibus, antennis pedibusque testaceis ; elytris elon- 

 gatis profunde striatis. Long. J^ 15 mm.; $ i6| — 17 mm. 



Allied to I. gracilis, but larger and of different proportions, the elytra being longer 

 in comparison with the thora.x. There is very considerable difference in the se.xes, the 

 male being smaller and much more slender than the female. In the male the length of 

 the thorax from front margin to hind angle is nearly 3^ mm., that of the elytra 1 1 mm. ; 

 in the female the thoracic length is \\ mm., the elytral length 12 mm. The antenna 

 of the male is fully 8 mm., that of the female fully 7 mm. These measurements are 

 quite sufficient to distinguish the species. Five specimens. 



Hab. Kauai. 4000 ft. vii. 1896; high plateau, viii. 1896 (Perkins). 



(3) Itodacnus gracilis Sharp. 



Itodacnus gracilis Sharp, Tr. Dublin Soc. iii. 1885, p. 156, PI. IV. fig. 18. 



We have a large series of this species. The female is a good deal larger than the 

 male, so that there is considerable difference in size between the smallest male and the 

 largest female; the respective dimensions being ii^and 16 mm. The male antennae 

 attain a length of 7-i- mm. and those of the female (i\ mm. In the male the length of 

 the thorax from front margin to hind angle is 4^ mm., that of the elytra scarcely 9^. 

 The length of the thorax in the female is 5 mm., and that of the elytra about 10J-. 



Though the species is found on two distant islands, there is but little variation. 

 Many of the specimens from Hawaii are somewhat darker in colour than those from 

 Oahu. We have received about i 20 examples of /. gracilis, about 30 of them being 

 from OahLi. 



Hab. Oahu, Hawaii. — Oahu: Honolulu (Blackburn, Perkins); 2000 ft. ix. J896; 

 N.W. Koolau range, v. 1901 and vii. 1901. — Hawaii: Olaa, on several occasions; 

 above Hilo, viii. 1896 and 11. 1897 (Perkins). 



