COLEOPTERA 521 



impresso, hoc et metasterno fortius punctatis, segmento primo abdominis fere impunc- 

 tato. Long, circa \\ mm. 



Plate XV. figs. 10, II. 



This species is distinguished by its remarkable sculpture. The prothorax has 

 before the base a median group of rather large simple punctures, and there are smaller 

 punctures extending along the base towards, but not to, the hind angles ; the rest of 

 the surface has very fine, rather rare, punctures, which in some specimens are drawn 

 out into marked longitudinal scratches. The disc of the elytra nearer the base has 

 numerous big strong punctures : towards the apices the elytra are smoother, having 

 only fine rather rare punctures, more or less drawn out into longitudinal .scratches. 

 Two oblique striae may be present near the shoulder of either elytron. Keel of 

 prosternum (PI. X\'. fig. 12) only about i^ as long as the breadth at the base, the 

 front margin c iUiost same width as the base, the striae approaching one another 

 somewhat in the median part. Mesosternum very vaguely impressed, it and the 

 metasternum with numerous large punctures, which end abruptly at the suture between 

 metasternum and first abdominal segment ; the latter is impunctate excepting for a very 

 few small punctures, but has (like the pygidium) an extremely fine microscopic rugulosity 

 or alutaceousness ot the surface. Wings not reduced. Six specimens. 



H.AP.. Molokai ; 4000 ft., &c. (nos. 179, 191, 196, Perkins). 



(11) Acritns niakaivcliae, sp. nov. 



Oblongus, parum depressus, piceus, nitidus ; capite subtiliter ac rare punctato ; 

 prothorace subtiliter nee dense (interdum conspicue aciculatim) punctato, basin versus 

 in medio sat fortiter punctato; elytris basin versus fortiter nee dense punctatis, ad apices 

 subtilissime (interdum longitudinaliter aciculatim) punctatis ; prosterno suboblongo, 

 transversim convexo ; mesosterno et metasterno fortiter nee dense punctatis ; segmento 

 primo abdominis fere impunctato. Long, circa i mm. 



This species is allied to A. sculptus, its scheme of sculpture being similar. It is 

 distinguished by its smaller size and somewhat depressed form ; the elytral punctures 

 are much smaller and further apart, so that the elytra (PL XV. fig. 14) lack the coarse 

 rough appearance seen in A. sculptus \ the keel of the prosternum (PI. XV. fig. 13) is 

 narrower in proportion to its length ; the meso- and metasternal punctures are smaller 

 and the interspaces between them larger. The species have a quite different general 

 appearance. The first abdominal segment of A. niakaivc/iac is impunctate save for a 

 very few small punctures, but has not the microscopic striation seen in A. sculptus. 



There are two distinct sets of specimens ; one in which the fine punctures ot the 

 head, all the front part of the thorax, and the apical portions of the elytra are markedly 

 aciculate (i.e. drawn out into fine scratches) ; the other set in which they are quite simple 

 or only very slightly drawn out. All the specimens however were fountl in the same 



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