2l8 



ORTHOPTERA 



CHAP. 



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 tlie 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, 

 flexible, and unsegmented. The legs 

 have rather small coxae, and three- 

 jointed tarsi, two of which are 

 densely studded with fine hairs 

 It is difficult to detect the stigmata, 



Fig. 116. Foetus of Hemimerus. 

 (After Hansen. ) a, Antenna ; h, 

 organ from the neck ; c, cerci ; d, 

 membrane (?cast skins). 



beneath, as in Coleoptera. 



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 H. hanseni, has 

 been found living on the 

 body of a large rat, Crice- 

 tomys gambianus ; 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 ^lo.ni .-Hemwierustalpoides. Africa (After 

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



its food IS by no means clear. 



Not the least remarkable fact in connexion with this peculiar 



Insect is its gestation. The young are borne inside the mother. 



I 



