PHASMIDA. 



573; 



Duthiers there are eleven abdominal segments, and the anal 

 stylets are not articulated as in the Matitidoi , but are long 

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

 Libellula, as in Acroj^hylla, while the eleventh ring is a little 

 triangular tergite, situated between the anal claspers. The 

 egg-sac in Diapheromera femorata Say (Fig. 566, i), our com- 

 monl}^ diffused species, is flattened elliptical, with a lid in 

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

 hatch, and is deposited in the autumn. 

 The 3'oung when hatched are linear, and 

 much like the adults except that they 

 are wingless. The male is considerably 

 smaller than the female, and much more 

 slender. In Phasma, a tropical genus, 

 the two sexes are winged, the antennae 

 are about as long as the body, and the 

 limbs are slender. P. 4:-guttatum 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 

 Prisojrus diflfers 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. spinkeps 

 Burmeister is a Brazilian species, and is 

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

 A. Murray, spends the whole of the da}' under 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 PhyUium, 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 wings are often very large and 

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

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

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



Fig. 566. 



