499 



8 (9) Basal joints of the antennae with dense and very conspicuous 



bristly black hairs; hind femora normally black (except the 

 basal stalk) and partially red-legged examples infrequent. 

 (On Soplwra, Kona side of Hawaii) blncJcbimii. 



9 (8) Antennae evidently less strongly setose, examples with largely 



red hind femora are common, though perhaps more are like 

 typical hlachhurni. 

 (Pubescent lines of elytra either white or distinctly yellow 

 being variable; food plant Pipturus) lamarcl-ianus. 



10 (1) Antennae black or practically so throughout, except that in 



some examples the scape is pitchy or, more rarely, distinctly 

 red; the pubescent lines on the elytra yellow and wide, not 

 or hardly furcate at the base, though the basal edge is 

 emarginate. 



11 (1-) Elytra yellow or rufescent basally and at the sides. 



(Food plant Urera.) siilphurescens. 



12 (11) Elytra yellow at the sides as far forward as the base of the 



yellow pubescent marking or somewhat in advance of this, 

 but black above from the base of this marking to the base 

 of the elytra themselves. 

 (Food plant Suttonia.) giffardi. 



P. v'ltiicollis is best distinguished from the var. longnlus 

 by the dense white clothing- of the hind tarsi, that of the latter 

 being black, sometimes with a few white hairs mixed, just as 

 the other may have a few black ones. In life, vitficollis always 

 appeared to me a brighter insect, owing, I think, to the rather 

 greater development of the yellow pronotal stripes. So far as 

 is known the var. longulus never produces varieties with more 

 or less yellow elytra. 



The species of Plagitlimysus which are attached to Pelea, 

 whether on Hawaii or other islands, are always distinguishable 

 from the members of the blackburni group at the merest glance 

 by the deep velvety black spot in the furcation of the pubescent 

 lines of the elytra, which to my eyes gives them a more pleas- 

 ing appearance than the others. The following form appears 

 to be either a new species or at least a new race of P. zncinus 

 Sh. Originally I possessed a small series of this new form, 

 but having given away specimens under the name vicinus, I 

 now have only a pair left. It was found on a species of 



