COLEOPTERA. 423 



PsELAPHTJs, Herbst. 

 In the last of the Pselaphii we observe this peculiarity — their antennx con- 

 sist of but six joints, or even one. They form the genus 



Claviger, 



Where the antennae consist of six distinct joints. Tliese Insects have no 

 apparent eyes. The maxillary palpi are very short, without distinct articu- 

 lations, and with two terminal hooks. The two first joints of the tarsi are 

 very short; the third and last is very long-, with a single hook at the 

 extremity. 



These Pselaphii are found under stones in bari'en localities, and even in 

 the hills of certain small, yellow Ants. 



ORDER VI. 



ORTHOPTERA (1) 



In the Insects of this order, we find the body generally less indu- 

 rated than in the Coleoptera, and soft, semi-membranous elytra fur- 

 nished with nervures, which, in the greater number, do not join at 

 the suture in a straight line. Their wings are folded longitudinally, 

 most frequently in the manner of a fan, and divided by membranous 

 nervures running in the same direction. The maxillas are always 

 terminated by a dentated and horny piece covered with a galea, an 

 appendage corresponding to the exterior division of the maxillas of 

 the Coleoptera. They have also a sort of tongue or epiglottis. 



The Orthoptera undergo a semi-metamorphosis, of which all the 

 mutations are reduced to the growth and development of the elytra 

 and wings, that are always visible in a rudimental state in the nymph. 

 As both this nymph and the larva are otherwise exactly similar to 

 the perfect Insect, they walk and feed in the same way. 



The mouth of the Orthoptera consists of a labrum, two mandi- 

 bles, as many maxillae, and four palpi; those of the jaws always have 

 five joints; whilst the labials, as in the Coleoptera, present but three. 

 The mandibles are always very strong and corneous, and the ligula 

 is constantly divided into two or four thongs. The form of the an- 

 tennae varies less than in the Coleoptera, but they are usually cora- 



(1) Straight-winged. 



