Relationships existing amongst Natural Objects. 421 



Fi|f. 2. Adelotopus Ipsoides, Westw. 2 a. Upper side of the head. i. and i. re- 

 presenting the genee visible from beneath. 2 b. Underside of 

 the head. a. The situation of the articulation of the mentuni. 

 e. Mentum. d. Jugulum. J". Maxillary palpus, the base of the 

 maxilla concealed by the side of the mentum. /. The im- 

 mensely developed genae. c. The canal for the antennae, "•. 



Fig. 3. Sphallomorpha decipiens, Westw., and details. 



3 a. Front of head above, with the mandibles and labrum. 

 3 b. Underside of the head. a. A very indistinct line, terminating on 

 each side in a slight notch and bristle, and indicating the ordi- 

 nary place of the articulation of the mentum. b. A deep canal 

 for the action of the base of the maxillay., and separated from 

 the outer canal c. (formed for the reception of the antennae g.) by 

 an elevated ridge i. d. Jugulum. e. Mentum. 



3 c. Maxilla. 3 d. Labial palpus. 3 e. Underside of anterior tarsus. 

 Fig. 4. Silphomorphafallax, Westw., and details. 



4o. Front of head, above, with the mandibles and labrum. 



4 b. Underside of the head, exhibiting no traces of the ordinary arti- 



culation of the mentum, which here forms a component part of 

 the skull. 

 Ac. Maxilla. 



4 d. Underside of the thoracic segments, showing the acuminated pro- 



sternum (*) and the small size of the metasternum (**). 

 Fig. 5. Rhyzopertha pusilla, Steph., and details. 



5 a. Labrum. 5 b. Mandible. 5 c. Maxilla. 5 d. Instrumenta labi- 



alia. 5 e. Antenna, bf. Fore tibia and tarsus. 

 Fig. 6. Tomicus fuscus. Marsh., and details. 



6 a. Mandible. 6 b. Maxilla. 6 c. Mentum and labial palpi. 6 d. An- 



tenna, 6 e. Fore tibia and tarsus. 

 Fig. 7- Condylodera Tricondyloides , Westw., and details. 



7 a. Front of head. 7 b. Mandible. 7 c. Maxilla. 7 d. Instrumenta 



labialia. 



