44 Dr. Sharj) on the Rhyjichophorous 



I. Antennce of male provided at the apex ivith an acumi- 

 nate appendage ; head of male of variable length, 

 according to the individual, and in all the species 

 (except A. fulvus) 2vith a cylindrical j^ortion in front 

 of the thoracic articulation. 



This is the only group in which the antennae have an 

 acuminate appendage ; it is very conspicuous in the 

 male sex, and even the females have the termination of 

 the antennae more acute than they are in the species of 

 the other groups. 



AjJoderus longicornis. 



Apoderm lomjicornis, Roelofs, Ann. Ent. Belg., xvii., 

 p. 131. ' 



Mr. Lewis has brought back a series of twelve exami)les 

 of this elegant insect, l)ut all are males ; they were pro- 

 cured in several localities, and vary much in the 

 elongation of the head and antennae, but the coloration 

 of the latter part is constant. The females obtained by 

 Mr. Lewis on his previous journey, and assigned to this 

 species, I am quite unable to distinguish from A. fulvus ; 

 and the female of A. longicornis is perhaps unknown to 

 me. As the two species are extremely closely allied, 

 except in the male characters, it may prove that the 

 females are similar in nearly all respects ; but I should 

 anticipate that the black basal joint of the antennae may 

 be a good diagnostic character. 



Found on the main island. 



Apoderus nigricollis. 



Apoderus nigricollis, Roelofs, Ann. Ent. Belg., xvii., 



p. 131. 

 A, montanus, Roelofs (nee Jekel), Ann. Ent. Belg., 



xvii., p. 134. 



A. ■nigricollis was described by M. Roelofs from three 

 male examples. Mr. Lewis has now met with the species 

 on white beech at Wada-toge, and also in other localities. 

 The male varies much as to the elongation of the head 

 and antennae, but the species may be readily dis- 

 tinguished in each sex from A. longicornis by the coarse 

 sculpture of the upper and under surfaces. A. montanus 

 was described from a single female example, and it 



