PHASMIDA. 



573 



Duthiers there are eleven abdominal segments, and the anal 

 stylets are not articulated as in the 3Iantidce , but are long 

 corneous claspers, and in some cases, very much like those of 

 Libellula, as in Acrophylla, while the eleventh ring is a little 

 triangular tergite, situated between the anal claspers. The 

 egg-sac in Diapheromera femorata Say (Fig. 5GG, J), our com- 

 monly diffused species, is flattened elliptical, with a lid in 

 front which can be pushed open by the embryo when about to 

 iiatch, and is deposited in the autumn. 

 The young when hatclied are linear, and i 

 much lil<e the adults except that they 

 are wingless. The male is considerably 

 smaller than the female, and mucli more 

 slender. In Phasma, a tropical genus, 

 the two sexes are winged, the autennce 

 are about as long as the body, and the 

 limbs are slender. P. A-gnttatnm Bur- 

 meister is between two and three inches 

 in length, and green on the costal border 

 of the hind wing, and rose colored be- 

 hind. It lives in Borneo. The genus 

 Prisopus dilfers from the other two 

 genera in the shortened mesothorax ; 

 the legs are much flattened and leaf- 

 like ; the abdomen is longer than the 

 thorax, flattened beneath, and widened 

 on the sides posteriorly. P. spiniceps 

 Burmeister is a Brazilian species, and is 

 two and a half inches long. P. flahelUcornis Stoll, according to 

 A. Murray, spends the whole of the day nnder water adhering 

 to stones in the mountain streams of Brazil, and towards dusk 

 flies about ; it is the only truly aquatic Orthopteran known. 



The genus PJujllium, found only in the East Indies, most re- 

 markably imitates various leaves, one species having its fore 

 wings so veined and colored as to resemble most strikingly a 

 dried and withered leaf. The Avings are often very large and 

 broad, and as if to aid in canying out the analogy the legs 

 have broad leaf-like expansions. The antenna? of the males are 

 twenty-four-jointed, while in the females they are much shorter, 



