503 



very great differences in the hairs of the tibiae and of other 

 parts, as variation or according" to sex, and sufficient material 

 of C. niicrogastcr for a proper investigation has not yet been 

 secured. 



In Plagithmysiis bishopi, even in examples bred from the 

 same wood, there is variation in the density and arrangement 

 of the liairs of the hind til)iae. and they may be pale or black, 

 even in examples of the same sex. P. y'lffardi notably exhibits 

 dimorphism in these hairs, while some others seem to exhibit 

 neither variational nor sexual differences in these. 



The two following species of NcsitJimysus are very distinct 

 species of this remarkable genus. 



Nesithmysus forbesii H^- »• 



Black, the head slightly aeneous, the pronotiun slightly so in some 

 lights, the elytra very conspicniously metallic, with greenish tint. Head 

 with yellow hairs, not densely clothed. Pronotnm on each side about 

 the middle with a strongly prominent angle; the median crest is 

 represented by a strong prominence in front, in lateral view triangular, 

 like a large blunt thorn, on its hind surface rugosely punctate, and 

 a posterior jirominence, which in side view is subtruneate and rugosely 

 sculptured on its iippei' surface; between these and on most of its 

 surface the pronotnm is smooth and shining, irregularly and finely 

 [iunctured, clothed with sparse yellow setae, representing the vittae of 

 Phiflithmi/.^u.s. On either side between the posterior median prominence 

 and the lateral angle, and on a line with the former, is another 

 strong ]irominence, roumled at the ajsex, and between this and the 

 lateral angle is another broad, but not dense, [ atch of yellow hairs. 

 The elytra are shining and thiidy and irregularly clothed with yellow 

 setae like those on the thorax, but no definite j'attern is formed. 

 The sculpture consists of shallow depressions and larger punctures, 

 ni'xed with finer ones, wliich arc inore definite. There is a dense line 

 of 3'ellow hairs extending from tiu' hind coxae to the jiatch covering 

 the ends of the mete])isterna ; on eith(>r sid(> of the Ncntral segments 

 1-3 at the a]iex is a distinct spot nf these hairs; tin' ."')th ventral 

 segment is conspicucnisly excised in tlie middle. The specimen is no 

 doubt a female, the antennae shoi-t, ;d)out thit'e-cpiarters of the length 

 of the elytra, the loth joint not twice as long as wide. Length 

 about 20 mm. 



Hab. — East Maui, llai])uaena, 3100 ft. A single example 

 from Pelea on lune 20th, 1020 (C. X. Forbes). 



