288 FAUNA HAWAIIENSIS 



(4) Tachys mucesceus, Blackburn. 



Tachys niucescens Blackburn, 1. c. 



Hab. Oahu. Unique ; in decaying vegetable matter on the plains of Honolulu 

 (Blackburn). 



Group LEBIIDES. 



The two forms of this group have very little claim to belong to the Hawaiian 

 Fauna. Plocliiomis pallens appears however to be naturalised, though apparently it 

 does not extend its range. 



Plochionus Dejean. 



(i) Plochionus pallens, Faliricius. 



Carabus pallens Fabricius, Syst. Ent. (1775) p. 244. 



Plochionus bonfilsii Dejean, Spec. Gen. i. p. 251. 



Plochionus pallens Bates, Biol. Centr. Amer. Col. i. pt. i, p. 198. 



Hab. Mauai. Very rare (Blackburn, Perkins). 



According to Bates this species is so widely distributed that its original home 

 cannot be determined. He says that it frequents the baggage of passengers, so that it 

 is no wonder that it is widely disseminated. 



SARONYCiiiUiM Blackburn. 



( I ) Saronychiuvi inconspicmivi Blackburn. 



Saronychium incouspicutini Blackburn, Ent. Mo. Mag. xiv. 1877, p. 142. 

 Hab. Oahu. In Honolulu and on Konahuanui (Blackburn, 2 specimens). 



Fam. DYTISCHME. 



Coi'ELATUs Erichson. 



(i) Copelatus par-^ulus, Boisduval. 



Colymbetes parvulus Boisduval, Voy. Astrolabe, Ent. p. 50. 

 Copelahis parvulus Sharp, Tr. Dublin Soc. (2) 11. p. 568. 

 Copelattis mauiensis Blackburn, Tr. Dublin Soc. (2) in. p. 120. 



This small insect, of slender, parallel form, and dull, silky surface, 4 or 5 mm. in 

 length, cannot be confounded with the larger Rhantus pacijicus, which is of oval outline 

 and 10 or 12 mm. in length. 



C.parvulus varies in colour, being sometimes blackish, sometimes dull ferruginous. 

 I am quite unable to distinguish C. mauiensis as anything different from C. parvnius. 



Hab. Oahu. — Lanai. — Molokai. — Maui. 



