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. micro gastcr for a proper investigation has not yet been 

 secured. 



In Plagithmysus bishopi, even in examples bred from the 

 same wood, there is variation in the density and arrangement 

 of the hairs of the hind tibiae, and they may be pale or black, 

 even in examples of the same sex. P. giffardi notabh' exhibits 

 dimorphism in these hairs, while some others seem to exhibit 

 neither variational nor sexual differences in these. 



The two following species of NesitJimysns are very distinct 

 species of this remarkable genus. 



Nesithmysus forbesii sp. n. 



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

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

 with yellow hairs, not densely clothed. Pronotum 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 prominence, which in side view is subtruncate and rugosely 

 sculptured on its upper surface; between these and on most of its 

 surface the pronotum is smooth and shining, irregularly and finely 

 punctured, clothed with sparse yellow setae, representing the vittae of 

 Plagithmysus. On either side between the posterior median prominence 

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

 strong prominence, rounded at the apex, and between this and the 

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

 The elytra are shining and thinly and irregularly clothed with yellow 

 setae like those on the thorax, but no definite pattern is formed. 

 The sculpture consists of shallow depressions and larger punctures, 

 mixed with finer ones, which are more definite. There is a dense line 

 of yellow hairs extending from the hind coxae to the patch covering 

 the ends of the metepisterna ; on either side of the ventral segments 

 1-3 at the apex is a distinct spot of these hairs; the .5th ventral 

 segment is conspicuously excised in the middle. The specimen is no 

 doubt a female, the antennae short, about three-quarters of the length 

 of the elytra, the 10th joint not twice as long as wide. Length 

 about 20 mm. 



Hab. — East Alaui, Haipuaena, 3100 ft. A single example 

 from Pelea on June 29th, 1920 (C. N. Forbes). 



