Relationships existing amongst Natural Objects. 421 



Fi^. 2. Adelotopus Ipsoides, Westw. 2 a. Upper side of the head. /. and /. i-e- 

 presenting- the genœ visible from beneath. 2 h. Underside of 

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

 e. Mentuni. d. Jugulum. /. Maxillary palpus, the base of the 

 maxilla concealed by the side of the mentuni. /. The ini- 

 mensely developed gense. c. The canal for the antenna?, g. 

 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, terminatiug on 

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

 nary place of the articulation of the mentum. /;. A deep canal 

 for the action of the base of the maxilla /'., and separated from 

 the outer canal c. (formed for the reception of the antennfe g.) I)y 

 an elevated ridge /. d. Jiigulum. e. Mentum. 



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

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



4 </. 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. 



4 c. Maxilla. 



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



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

 Fig. 5. Rlu/zopertlia piisitla, Steph., and details. 



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



alia. 5 e. Antenna. 5/. Fore tibia and tarsus. 

 Fig. 6. Tomicusfuscus, Marsh., and details. 



6 fl. Mandible. 6 /v. Maxilla. 6 c. Mentum and labial palpi. G r/. An- 



tenna. 6 e. Fore tibia and tarsus. 

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



"J a. Front of head. 7 b. Mandible. 7 ('- Maxilla. ' d. Instrumenta 

 lal)ialia. 



