COLEOPTERA 639 



(61) i\/iyosfci->iHs acufus Blackburn. 



Mirostermis acutus Blackburn, Tr. Dublin Soc. 1885, p. 160. 



I have suggested under M. carina/us, that M. acHtns may be a form of that species. 

 Ten years ago I made a superficial examination of M. actt/iis, but for purposes of 

 identification it would be necessary to relax and thoroughly clean the unique type, 

 before coming to any decision on this point. 



Hab. Kauai (Blackburn). 



(62) Mirostermis tristis, sp. nov. 



Niger, griseo-pubescens, antennis (articulo secundo saepissime excepto) nigris aut 

 fere nigris, tibiis nigris aut nigricantibus, femoribus anterioribus plerumque, et nonnun- 

 quam caeteris, rufescentibus. Oculi minores et latissime separati. Antennarum clava 

 magnitudine mediocris, articulo secundo triangulari, angulo interno plus minusve acuto. 

 Pronotum ex majore parte obsolete punctatum, nitidum. Elytra dense subtiliter, 

 plerumque plus minus rugulose, punctata, griseo-pubescentia, lateribus longitudinaliter 

 rugulosis, et plus minus nitidis. Long. 2 "5 — 3 '2 5 mm. 



If I am correct in assigning a short series of examples to this one species, this is 

 one of the most difficult and obscure forms in the genus. I cannot determine the sexes, 

 for while some examples have larger antennae than others, some are intermediate in 

 this respect. There is a good deal of variation in the puncturation also. The black 

 colour, generally dense elytral puncturation, grey pubescence, moderate antennal club, 

 with the inner angle of the basal joint sharper than usual, and the very widely separated 

 eyes are the chief characters. The metasternum appears to be usually if not alwa}3 

 carinate, but the carina is not strong and varies in development. 



Hab. Hawaii, Kona district, above the wet belt. 



(63) Mirostcrnus vestitiis, sp. nov. 



Rufescens aut castaneus, elytrorum apicibus subpallidioribus, totus sat dense flavo- 

 pubescens. Oculi sat magni, sat late distantes. Antennarum articuli 3 ultimi mediocres, 

 horum articulo primo sat elongato (minus lato) angulo interno haud acuto, apice baud 

 fortiter producto. Elytra dense subtiliter punctata, parte apicali vel subtilius et 

 densissime punctulata, lateribus nitidis et ruguloso-punctatis. Long. 3"2 5 mm. 



There is not much difference between the four examples I have examined ; at 

 most the basal club joint of the antennae is rather wider in proportion to its length in 

 some than in others, and this might indicate a sexual distinction. It is, however, quite 

 likely that all are of the same sex. The colour, clothing and puncturation seem to 

 distinguish the species. 



Hab. Oahu, Honolulu range, 1500 ft. 



82—2 



