344 



width), one on each side of this, not reaching either the front or hind 

 margins, and ending in a bifid dilatation at the posterior tubercles, a 

 small spot on each side at about the middle of the length of the pro- 

 notum, black. More or less of the scutellum, the extreme tips of the 

 femora and the apices of the hind tibiae (at least beneath) are also 

 dark. Face beneath the antennae with yellow hair, an indefinite pubes- 

 cent patch of this color at the base of each wing-case and a spot at either 

 extremity of the mesopleura ; breast with pale flavescent pubescence. 

 Sides of abdomen with minute appressed pubescence and closely punc- 

 tured, the general surface between these shining, sparsely punctured and 

 clothed with erect, fine hairs. Fifth ventral segment excised at the apex 

 in the middle. 



The pronotal crest is much more pointed in front in one example 

 than in the other, but such variation is common in Plagithinystis. The 

 individuals examined have the appearance of being females, but tlie sex 

 is not certain without dissection. Length, 22-24 nim. 



IIab. Oaliii, Mt. Kaala ; one on oliia lehna July 4, 191») 

 fO. II. Swezey) ; one on Jnly 22, 1917, on Broiiss<iisl(( (J. C 

 IJrichvell). Described from these two examples. 



Plagithmysus swezeyi n. sp. 



Head, pronotimi and breast red. elytra black. Legs black or nearly 

 so, but the femora are red on the basal portion, more yellow in the case 

 of the hind pair, where the pale portion occupies about half their length. 

 Antennae dark brown or blackish fuscous. Hairs of the hind tibiae; and 

 tarsi dark. Face with minute white hairs (perhaps abraded), labrum 

 and the adjoining part above with yellow setae. Pronotum with a 

 narrow snow-white band on either side of the median crest, the liands 

 not dense, and a trace of a small white spot on tlie nnddlc of tlie 

 densely punctate sides. Elytra shining, roughly punctured on the basal 

 portion and with small spots (not closely placed) of snow-white hairs; 

 •on the posterior half the spots are placed in a line on either side of 

 the suture and become minute towards the apex; the spots are mostly 

 much separated from one another. Mesopleura with a dense white spot 

 in front and behind. Hairs of the hind tibiae and tarsi dark. Length, 

 male, 15 nun., witli the exposed tips of wings. 



This very elegant species belongs to the vitticollis group, and should 

 Ije placed next to P. loiigiilus (which will probably prove distinct from 

 F. z'itticollis). It is readily distinguished by the red head and pronotum 

 and the two narrow snow-white pronotal vittae. The female will very 

 likely have a smooth inipunctate area on the sides of the pronotum. 



Uwi. Hawaii, Xiulii. A single male, captnred ]\[ay 19, 

 1917, 1)y ]\lr. Swezey, is the only example I have seen. 



