2l8 



ORTHOPTERA 



the mandibles are concealed by the maxillae, but are large, com- 

 pressed, and on their inner edge toothed. The maxillae are well 

 developed, are surmounted by two lobes and bear five-jointed palpi. 



The ligula appears to be broad and 

 short, and formed of two parts longi- 

 tudinally divided ; the short palpi 

 consist of three segments. The men- 

 tum is very large. The lingua is 

 present in the form of a free pubescent 

 lobe with a smaller lobe on each 

 side. The structure of the pleura is 

 not fully understood ; that of the 

 abdomen seems to be very like the 

 earwigs, with a similar difference in 

 the sexes. The cerci are something- 

 like those of Gryllidae, being long. 



Fig. 116. — Foetus of Hemimerus. 



flexible, and unsegmented. 



The legs 



organ from the neck ; c, cerci ; 

 membrane (?cast skins). 



(After Hansen.) a, Antenna ; 6, have rather Small coxae, and three- 

 jointed tarsi, two of which are 

 densely studded with fine hairs 

 beneath, as in Coleoptera. It is difficult to detect the stigmata, 

 but Dr. Hansen believes there are ten pairs. 



The species described by Dr. Hansen as H. talpoides is prob- 

 ably distinct from that of Walker, though both come from 

 equatorial West Africa. Dr. 

 Hansen's species, which may 

 be called II. hanseni, has 

 been found living on the 

 body of a large rat, Crice- 

 toviys gamhianiis ; the In- 

 sect occurred on a few speci- 

 mens only of the mammal, 

 but when found was present 

 in considerable numbers ; it 

 runs with rapidity among 

 the hairs and apparently 



also springs. The nature of ^I<^; 117. —He^ninurusjalpoides. A.frica. (After 



its food is by no means clear. 



de Saussure. ) A, Upper ; B, under surface. 



Not the least remarkable fact in connexion with this peculiar 

 The young are borne inside the mother. 



Insect is its gestation. 



