EXPLANATION OF SOME TERMS, USED IN THE FOLLOWING WORK, 



NOT IN GENERAL USE. 



TERMS RELATING TO THE HEAD. 



Mola. Molary plate or space. (See p. 82, 129, &c.) A broad flat space on tbe inner side of the base of some mandibles, 

 having no molary teeth at tbeir apex, of Coleopterous insects (many Lamellicorns and Hydrophilus ) usually trans- 

 versely grooved, but sometimes smooth, and used in mastication. 



Pkomuscis. The HausieUum, or instrument of suction, of the Hemiptera and Homoptera. 



Lingua. The Tongue, (p. 49, 78, &c.) Often connate with tbe Labium and called by that name. It is, however, some- 

 times a separate organ. (See Introd. to Ent. iii. 337, e.) 



Scapus. Scape, (p. 31, &c.) The first, and often most conspicuous joint of the Antenna, terminating below in tbe bulb, 

 which inosculates in the head and acts the part of a rotula. 



Pedicellus. The Pedicel, (p. 109, &c.) The second joint of the Antenna, inosculating in the Scapus. 



Nasus. The Nose. (p. 67, 276) The terminal piece of the face with which the Labrum, or upper lip, articulates, often 

 called the Chjpeus. 



Postnasus. The Afternose. (p. 128) The part of the face, lying behind the Nasus, immediately contiguous to the An- 

 tenna, when distinctly marked out as in Camptorhina. (p. 43, 94.) 



Rhinarium. The Nostril-piece, (p. 43, 94) The space between the anterior margin of the Nasus and the Labrum, which 

 in most of the Lamellicorn beetles is vertical ; in Necrophorus it consists of membrane. 



TERMS RELATING TO THE TRUNK. 



Truntus isthmiatus. hthmiate-trunk. (p. 188) When an isthmus is formed between the Trunk and the Elytra, as in 

 Passalus. 



Manitruncus. The Manitrunk. (p. 69) The anterior portion of the Trunk to which the arms or fore legs are attached. 



Prothorax. The Fore-thorax, (p. 8, 35, &c.) The upper side or Shield of the Manitrunk. 



Ora. The Ora. (p. 106, 142) The infiexed or inferior lateral margin of the Fore-thorax, in many genera separated from 

 the Fore-breast by a suture. 



Antepectus. The Fore-breast, (p. 17, 126) The under side of the Manitrunk. 



Prosternuii. The Fore-breastbone, (p. 74, 87) An elevation of the Fore-breast between the Arms. 



Brachia. The Arms. (p. 72) Or first pair of legs. 



Clavicula. (p. 39) Or first joint of the arms answering to the Coxa of the two last pair of legs. 



Scapula. The Shoulderblade, or second joint of the arms, answering to the Trochanter in the other legs. 



Humerus. The Shoulder, (p. 87, 132) The third joint of the arms, answering to the thigh. 



Cubitus. The Cubit or Fore-arm. (p. 7, 74) The fourth joint of the arms answering to the Tibia or shank. 



Manus. The Hand. (p. 2, 47) The fifth portion of the arms, usually consisting of more than a single joint, and answer- 

 ing to the Tarsus or foot. 



Alitruncus. The Alitrunk. (p. 60) The posterior portion of the Trunk, which bears the organs of flight and the legs. 

 This part is resolvable into two segments. 



Meditru.vcus. The Mid-trunk, to which the upper organs of flight and the mid-legs are attached. 



Mesothorax. The Mid-thorax. The upper side of the mid-trunk, bearing the upper organs of flight. 



Elytra. Wing-cases. Horny or leathery organs peculiar to Coleoptera. 



