497 

 Table for Separation of Kauai Plagithmysus. 



1 (2) Metepisterna with a general clothing of fine white hairs, which 



do not form one or more very dense, definite, and conspicuous 

 spots, though often more dense at the apex than elsewhere. 

 (Hind femora rufescent, never black; the largest species.) 

 concolor. 



2 (1) Metepisterna with a very dense and definite tomentose spot 



at the apex and sometimes one at the base, or else very 

 densely covered over all or nearly all the surface. 



3 (4) Hind femora with a very long, pallid (almost white) basal 



stalk, which is nearly half the length of the whole joint; 

 surface of metepisterna concealed entirely (or almost so) 

 beneath dense short hair or tomentum arachiiipes*. 



4 (3) Hind femora with the stalk sometimes not thus pallid, or if so, 



then only about one-third the length of the joint ; mete- 

 pisterna with a dense tomentose spot at the apex and some- 

 times another at the base, but the middle bare. 



5 (8) A single dense tomentose spot on the metepisterna at the 



apex, the rest bare. (N. B. There may be a spot on the 

 mesopleura also.) 



6 (7) Longitudinal stripes on either side of pronotal crest indistinct 



to the naked eye (the crest itself being covered with minute 

 white hairs) ; pubescense along the suture of the posterior 

 half of the elytra practically continuous, not forming dis- 

 distinct, separate spots .aequalis. 



7 (6) Longitudinal stripes of pronotum quite distinct to the naked 



eye; pubescence along the suture of the posterior part of the 

 elytra forming distinct separate spots or flecks mtuiroi. 



8 (5) Metepisterna with a dense conspicuous spot in front and 



another behind (apically). 

 (Along the suture posteriorly the pubescense is broken up into 

 separate spots, placed in a single row, while the basal part of 

 the elytra is pubescent, but the hairs there are not grouped 

 into well separated distinct spots, as they are in munroi) 

 • ...••...■..••..•■..•■..••..■•..■•..••■•...••...•• ionotun. 



The .species of the hlackhnrni group which occur on Hawaii, 

 being subject to much variation in several cases, can generally 



* These characters were taken from females, the only sex before me 

 when the table was written. The female in this species is not like its 

 allies in superficial appearance, but the male resembles them very closely. 



