CERAMBYCIDJE. 



185 



being situated on different parts of the body ; in some cases the 

 sound is produced by the friction of the inner side of the hinder 

 margin of the prothorax against a striate surface on a short neck 

 in front of the scutellum over which the prothorax fits when at 

 rest (vide pp. 187, 188) ; in others again the sound is produced by 

 rubbing the hind femora against the edge of the elytra ; while in 

 others both these organs are present in the same insect. 



The peculiar scent given off by some of the species is very 

 worthy of notice ; sometimes it is agreeable (as in Callichroma 

 and Aromia), in others disagreeable (as in Agapanthia). At the 

 same time it must be remembered that we cannot tell what is 

 agreeable or disagreeable to other animals, and the sweet scent of 

 certain species maybe nauseous or injurious to enemies*. The 

 classification of the Longicokkta has given rise to considerable 

 controversy, but the following is the arrangement adopted by 

 Mr. C. J. Gahan in his recently published volume (page xi) on the 

 Indian species ; the Priojqtoe being treated as a subfamily of 



the CERAMBYCIDiE : 



A. Head in front oblique or sub vertical ; last joint 



of palpi not pointed at the end ; anterior tibiae 



not grooved beneath Cerambycidae, 



B. Head in front vertical or bent inwards well [p. 185. 



below the thorax; last joint of palpi pointed at 

 the end ; anterior tibiae generally with a groove 

 beneath Lamiida9 ; p. 188. 



Lacordaire adopts a division " Cerambycides aberrants," con- 

 sisting of three tribes and four genera, Thaumasus, Dynamostes, 

 Spondylis, and Scaphinus. The division, however, is not natural 

 and is of no practical use ; the only Indian genus Dynamostes falls 

 naturally into the Disteniiiste among the Cerambyciu.e. 



The most aberrant species of all is, perhaps, the well known 

 Brazilian Hypocephahis armatus, but as it does not come into our 

 fauna, its position need not be discussed at length. Lameere and 

 others have regarded it as a Clavicorn, but Dr. 8harp, who has 

 studied the insect closely, is evidently right in believing that it 

 really forms a subfamily of the Cerambycid.e, near the Prioniin"^, 

 from which it is distinguished by having the anterior coxal cavities 

 closed behind, and by the peculiar articulation of the head. It 

 is allied to two or three of the Indian species of Prioninse. 



Family 92. CERAMBYCIDAE. 



Head in front obliquely inclined, sometimes subvertical ; clypeo- 

 frontal sutures generally distinct, the clypeus as a rule relatively 

 large; last joint of palpi not pointed at the apex ; anterior tibial not 

 grooved beneath. 



* Proc. Ent. Soc. Lond. 1901, p. I. 



