144 INSECTA. 



The tarsi of the Dermestes alomarius of De Geer having appeared 

 to M. Leclerc de Laval to be composed of but one joint, with this In- 

 sect and some others we formerly established a new division of the 

 Coleoptera, that of the Monomera, which has been adopted by M. 

 Fischer in his Entomographia Imperii Russici, and Avho, with this 

 Insect, has formed a new genus, which he names Clambus. But it 

 appears— Gyllenh., Insect. Suec. IV, p. 292, 293— that M. Schuppel, 

 who of all our entomologists has accustomed himself the most to 

 minute and delicate observations, has made the same section under 

 the name of Ptiliuin. M. Gyllenhall, had \inited the species with 

 the Scaphidia, and, in fact, we think that the proper situation of this 

 new genus will be found in the vicinity of the latter. 



ORDER VI. 

 ORTHOPTER A *. 



In the Insects of this order, partly confounded by Linnaeus with 

 the Hemiptera, and re-united by Geoffroy to the Coleoptera, but as a 

 particular division, we find the body generally less indurated than in 

 the latter, and soft, semi-membranous elytra, furnished 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 maxillae are always terminated by a dentated 

 and horny piece covered with a galea, an appendage corresponding 

 to the exterior division of the maxillae of the Coleoptera. They have 

 also a sort of tongue or epiglottis. 



The Orthoptera f 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 otherAvise exactly similar to the 

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



The mouth of the Orthoptera consists of a labrum, two mandibles, 

 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 con- 

 stantly divided into two or four thongs. The form of the antennae 

 varies less than in the Coleoptera, but they are usually composed of 

 a greater number of joints. Several, besides their reticulated eyes, 

 have two or three small simple ones. The inferior surface of the first 



* The Ulonata, Fab. 



•|- In this Oder and in tbqse of the Lepidoptera, Hymenoptera, and Rhipiptera, 

 as •well as in the Apterous Hexapoda, there are no aquatic species. 



