COLEOPTHRA 525 



(17) Ac fit us sp. ? 



There is a single specimen from Hawaii which does not appear to fall within the 

 limits of any of the described species. It has the depressed form of A. actretns, but 

 the punctuation on the elytra is reduced, and like that of A. nepos. Moreover the keel 

 of the prosternum is broader than that of either A. nepos or A. eutrettis: it is oblong, 

 only just twice as long as broad, with striae nearly parallel ; in its proportion of length 

 to breadth it resembles that oi A. basalts as described on p. 523. The metasternum is 

 scarcely punctured. Wings not examined. 



Hab. Hawaii; Olaa, .xi. 1896 (no. 635, Perkins). 



(18) Acritus lanaiensis, sp. nov. 



Ovalis, nigro-piceus, antennis pedibusque fusco-testaceis ; baud fortiter nitidus ; 

 prothorace subtiliter et obsolete punctato, ante basin in medio rugoso, linea transversa 

 impressa ; elytris suturam versus punctatis, punctis ad latera et ad apices late obsoletis ; 

 prosterno sat longo, impunctato, inter strias concavo, striis subparallelis, fere rectis ; 

 mesosterno conspicue impresso, metasterno et segmento primo abdominis subtiliter 

 punctatis. Long, i^ mm. 



Plate XV. fig. 19 ; fig. 20, pro- and mesosterna. 



The surface is seen under the microscope to be very minutely rugulose, and it has 

 a characteristic, relatively dull, appearance. The prothoracic punctures are very fine 

 and shallow ; the basal sculpture is conspicuous, there being a median impressed and 

 rugose area, bounded in front by a nearly straight line. On the elytra the punctures 

 are restricted to a small area near the suture in the basal portion, a wide lateral part of 

 the disc, and a broad apical portion, being impunctate. The chief character lies in the 

 form of the prosternum, the keel of which is distinctly concave between the striae, a 

 condition not found in any other known Hawaiian member of the genus (PI. XV. 

 fig. 20) : it is about twice as long as the breadth between the striae ; the striae are 

 nearly parallel and straight. There is a conspicuous impression on the mesosternum ; 

 metasternum finely punctured. 



In one specimen the elytral punctures are slightly aciculate and extend over a 

 much larger area : this form is intermediate between that with the much reduced punc- 

 tuation, and the var. scjilptilis. Wings not examined. .Seven specimens. 



Hab. Lanai ; 2000 — 3000 ft. (nos. 83, 93, &c., Perkins). 



Acritus /atiaioisis, var. sciilptilis, var. nov. 



Fortius punctatus ; prothoracis punctis parum fortioribus ; elytris crebre aciculatim 

 punctatis, punctis ad latera baud late obsoletis; prosterno distincte punctato, angustiore; 

 mesosterno rugose punctato, metasterno et segmento primo fortiter punctatis. 



