HAPLOCLADON. 249 



NOTE XXVI. 



A NEW SUBGENUS OE THE COLEOPTEROUS 

 EAMILY DRILIDAE 



DESCRIBED BY 



the Rev. H. S. GORHAM. 



Haplocladon, subgen. nov. 



Generi Diplodadon Gorham ') valde affine, sed anten- 

 nae simpliciter pectinatae. Antennae duodecimi-articula- 

 tae , articulo basali valido subquadrato , secundo brevi quam 

 hoc dimidio rainore, tertio triangular!, angalo interno ra- 

 mum emittente; quarto ad undecimum perbrevibus, latitu- 

 dine baud longioribus , singulis ramum sat longum emit- 

 tentibus , longius pubescentibus; articulo duodecimo sim- 

 plici, longitudine ramum precedentem vix aequali. 



Femina latet. 



This insect, which Mr. C. Ritsema, the energetic Cole- 

 opterist of the Leyden Museum , has sent me since my 

 description of the genus Diplodadon '), affords me great 

 perplexity , for , except in the diflPerence in the antennae , 

 and minor differences in size and colour, the species abso- 

 lutely resembles the insect there described. The diffe- 

 rence is not sexual , for all the specimens are males. It 

 does not look like a merely diminished degree of develope- 

 ment, for there is no trace of the inferior branches. It 

 may be a case of dimorphism , and it appears to me that 

 the best way to treat it is as a possibly dimorphic form, 



1) Nofes from the Leyden Museitm. Vol. V (1883). p. 5. 



Notes from the Leyden IVEuseum, Vol. V, 



