COLEOPTERA 



191 



Wingless forms, without a definite thoracic margin, sculpture normal. Pseudobroscus, Derobroscus, 



Broscoiiymiis. 

 Thorax margined ; sculpture normal, not deep pits. 



iChakomenus, metasternum short | 4th joint of hind tarsus 



Wings fully \Baryneus, metasternum elongate / not bilobed. 



developed j Co/podisciis, a basal thoracic seta | 4th joint of tarsus 



\Mysticomenus, no thoracic seta / bilobed. 



IAnchottvmus, tarsi not lobed ) , 



.,.,,, no thoracic seta. 



Apteromesus, tarsi bilobed ) 

 Mainia \ 



DisenocJiHs \ i l^^sal thoracic seta. 



BarypristHS ' 



Prodisenochus 2 thoracic setae. 



Blackburnia Sharp. 



Blackburnia Sharp, Ent. Mo. Mag. xiv. (1878) p. i 79 and op. cit. xx. (1884) p. 217. 



This genus must be considered as among those that have a single pronotal seta on 

 each side, thousfh the incrustation of the surface leads to the concealment or destruction 

 of the seta, and the rough sculpture makes it difficult to detect the point of insertion. 

 This is the most deeply .sculptured of the Hawaiian Anchomenids, but the surface is 

 always covered with an incrustation by which the sculpture is concealed. The thoracic 

 setae are destroyed in all the individuals before me except one : the point of insertion is 

 on the upturned edge, close to the hind angle. 



(i) Blackburnia uisignis. Sharp. 



Blackburnia insignis Sharp, Ent. Mo. Mag. xiv. p. 179, and Tr. Dublin Soc. n. s. 

 III. PL IV. fig. 4. 



Although the dilatation of the front tarsi of the male is so slight as almost to be 

 imperceptible, and although the two rows of sexual hairs on their underside are not 

 visible, yet this sex may be distinguished from the female by there being only one seta 

 on each side of the middle of the last ventral plate instead of two, as is the case in the 

 female. 



Hab. Oahu : Waianae mountains 2500 ft., July (Blackburn); February (Perkins). 



Van kaalensis, var. nov. 



Elytra only were found of this form ; the sculpture is not so extreme, the interstices 

 being less raised and the foveae not so deep and not so definitely separated. 



Hab. Oahu: Kaala mountains, 3000 ft., March 1893 (Perkins). 

 Y. H. III. 25 



