COLEOPTERA 461 



Closely allied to A. brevis, but readily distinguished by the differences in sculpture. 

 We have only one specimen, a female. 



Hab. Oahu, near Honolulu, August 1900 (no. 785, Perkins). D. S. 



EuPETiNUS, gen. nov. 



Corpus sat latum. Coxae anteriores parum distantes ; presternum inter eas nullo 

 modo protuberans, processu ad apicem tantum minutissime ciliato. Co.xae posteriores 

 distantes. Tarsorum lobis baud magnis. Alae perfectae. 



The species assigned to this genus consist of insects of smaller size than Oiiliosto- 

 lus, with the prosternal process small and quite destitute of any long hairs at the tip. 

 The prothora.x has always three or four depressions on the disc, but they are variable 

 in distinctness even in the same species. The elytra too have in most cases several 

 depressions, but in numerous species these are almost obliterated. The male pygidium 

 is not notched or emarginate apically, 



The genus is a most difficult one to deal with owing to the great variability of the 

 species and to their being extremely closely allied. Colour is especially variable, and 

 cannot be relied on. A curious variation occurs in several species, inasmuch as the 

 black colour of the elytra and abdomen may be concentrated chiefly on the anterior 

 parts, leaving the hinder portion of the two parts more or less clear yellow. In this 

 variation the elytra are often black in front and yellow behind ; we have consequently 

 spoken of this form as van diiiiidiatus (PI. XIV. fig. 20). In some of the extreme 

 forms of this variation the abdomen has become entirely yellow. 



It is impossible to tabulate the species of this genus in any way that would be 

 practically useful, and the only sections we can establish depend on the width of the 

 expanded lateral margin of the elytra. It is hard to draw the line exacdy between 

 these two sections, but a number of species have these margins conspicuously broad ; and 

 we have placed these species, nos. 18 — 24, at the end of the genus. It is possible that 

 observation of the habits of the species may throw some light on the subject of these 

 obscure forms, which we feel we are leaving in a very unsatisfactory state. D. S. 



(i) Eupctinus insigiiis, sp. nov. 



Nigricans, pedibus antennarumque basi prothoracisque marginibus fusco-ferrugineis, 

 elytris abdomineque flavo-ferrugineo-variegatis, nitidus ; prothorace fortiter transverso, 

 antrorsum angustato, angulis posterioribus fere rectis, disco quadri-impresso, sat obsolete 

 punctato ; elytris parum inaequalibus, posterius flavo-ferrugineis, sulcis punctatis, inter- 

 stitiis minute punctatis ; abdomine parcius punctato. Maris segmentum terminale 

 subtruncatum, angulis late rotundatis. Long. corp. 4 — 5 mm. ; lat. corp. i^ — 2 mm. 



The pygidium in both sexes is covered with a minute but distinct reticulation : the 

 punctures are few and the hairs that rise from them short. The last ventral segment 

 also is scantily punctuated. The male supplementary segment is nearly truncate, only 



