1918.] 



F. H. Gravely : Passalidae of the World. 



105 



Labienus ptoxoides, n. sp. 



Figs. XIV, 3 and XV, 2. 



Two specimens, one from Andai and the other from Mt. Arfak, both in New Guinea. 

 Length 44-46 mm. 



This species is allied to L. gracilis and L. ptox. The antennae resemble those of L. ptox, 

 the first two lamellae being quite short and the remaining four very long. The secondary 

 scars of the mentum are straight, and extend to the posterior margin. The head closely 



Fig. XV. 



Labienus spp. ; mentum x 8. 

 1. L. inaequalis, Gravely. 2. L. ptoxoides, Gravely. 



3. L. ptox, Kaup. 



resembles that of both L. gracilis and L. ptox, especially the latter. The pronotum resembles 

 that of L. ptox, the scars being more densely hairy and punctured than in L. gracilis. In 

 all other respects the present insect resembles both species. 



Labienus ptox, Kaup. 



Fig. XV, 3. 



Eriocnemis ptox, Kaup, 1868«, p. 25. 

 Labienus ptox, Kaup, 1871, p. 39. 



Numerous specimens from New Guinea (Stephansort, Bongu, Milne Bay and Roon 

 Islands), Aru (Ureiuning and Wamma Dobbo) and Waigeu. Also one said to come from 

 Borneo and three from Sumatra. Length 48-58 mm. 



This species differs from the last only in its larger size and in having the scars on the 

 mentum strongly arched instead of straight. 



Labienus compergus (Boisduval). 



Fig. XIV, 4; also pi. 1. 



Passalus compergus, Boisduval, 1835, pp. 244-246. 

 Vellejus compergus, Kaup, 1871, p. 36. 



Several specimens from New Guinea (Milne Bay ; Stephansort, Astrolabe Bay ; Andai ; 

 Kapaur ; and Hattam, Arfak) and one from Waigeu. Length 32-36 mm. 



The antennae resemble those of the majority of species belonging to the genus. The 

 right outer tubercle is more or less distinctly double. The left outer tubercle may be 

 similar, or may be composed of three more or less distinct processes. The pronotal scars 

 are unpunctured and hairless. The mesosternal scars are variable. The posterior 

 intermediate areas of the metasternum are unpunctured. All the grooves of the elytra* 



