COLEOPTERA 



455 



or at any rate only darker in the central portion : the ground-colour of the elytra 

 and abdomen is red-brown. Mr Perkins' Hawaii specimens are mostly distinctly 

 smaller, and very dark, the ground-colour of elytra and abdomen being almost black. 

 But some of them var^', approaching the Oahu specimens, and it does not seem 

 possible to separate the two series. 



O. guttatus is characterised by the presence of lighter, reddish or testaceous, 

 marks on the elytra. It is longer than O. sordidus, and less pubescent ; the thora.x 

 is relatively longer, much less rounded at the sides, more nearly quadrate, and has 

 the four impressions on the disc less marked. 



Hab. Oahu, Hawaii. — Oahu; near Honolulu, 1500 ft. or more, usually at 

 exuding sap of Koa tree (Blackburn). — Hawaii ; Kona 3500 ft. vii. 1892 (Perkins). 

 H. S. 



(6) Ortliostolus sordidus. Sharp. 



Bracliypcplus sordidus Sharp, Tr. ent. Soc. London, 18S1, p. 514. 



Plate Xni. fig. 23, wing. 



This insect was described from a single badly preserved female, from Kilauea, 

 Hawaii. We have now 15 specimens, from Kona, Hawaii, and one % from Mauna 

 Loa, the district where the original specimen was caught. 



The species is very variable in colour. Some specimens are red-brown, more 

 or less dark brown in the central parts of the prothora.x, abdominal segments, and 

 sometimes of the elytra also ; others are dark brownish-black, with the red-brown 

 colour reduced to two small areas at the base of each elytron, and to the posterior 

 margins of the abdominal segments. The posterior margins of the elytra are curved. 

 The male supplementary segment is strongly acuminate. The male pygidium is 

 truncate, with more or less of a notch in its posterior margin ; female pygidium rounded 

 and somewhat narrow at the ape.x. 



One dark female differs from the rest in being more shining. A single male also 

 is more shining than the rest, and has the notch in the pygidium deeper. 



The species agrees with the allied O. kaiiaiensis and O. atratus and with Cyrtostolus 

 subalatiis, in having the pubescence on the elytra concentrated in places into tufts, the 

 most conspicuous of which is one near the middle of the elytron. 



Hab. Hawaii. Kona, 3000^ — 4000 ft., and Mauna Loa 4000 ft., vii. and viii. 

 1892 (Nos. 316, 823. Perkins) ; Kilauea, about 4000 ft. (Blackburn). H. S. 



(7) Orthostohts expers, Blackburn. 



Bracliypcplus cxpcrs Blackburn, Tr. Dublin Soc. iii. 1885, p. 136. 

 This form is known only by a single specimen, now in the collection of the British 

 Museum. We cannot quite match it with any specimen of O. sordidus. It is entirely 

 F. H. III. 59 



