ORTIIOPTERA. 161 



covers, transparent, and faintly tinged with yellow; hinder 

 knees black; spines on the hind shanks tipped with black. 

 Length from I to more than -^^ inch ; exp. from -^^ to nearly 1 

 inch. 



The flight of the short-winged locust is noiseless and short, 

 but it leaps well. Great numbers of these insects are found 

 in our low meadows, in the perfect state, from the first of 

 August till the middle of October. They are easily distin- 

 guished from other locusts by their short and narrow wings, 

 by the yellow color of the body beneath, and by the yellow 

 legs and black knees. 



III. TETRix. Grouse-locust. 



The Greeks applied the name of Tetrix to- some kind of 

 grouse, probably the heath-cock of Europe, and Latreille 

 adopted it for a genus of locusts in which, perhaps, he fan- 

 cied some resemblance to the bird in question. Linn«us 

 placed these locusts in a division of his genus Gryllus, which 

 he called BiiUa, a name that ought to have been retained for 

 them. The principal distinguishing characters of the genus 

 have already been given, and I will only add that the body is 

 broadest between the middle legs, narrows gradually to a point 

 behind, and very abruptly to the head, which is much smaller 

 than in the other locusts. The wings are large, forming nearly 

 the quadrant of a circle, thin and delicate, and scalloped on 

 the edge ; when not in use they are folded beneath the pro- 

 jecting thorax. The four boring appendages of the females 

 are notched on their edges with fine teeth, like a saw. La- 

 treille and Serville have stated that the antennae consist of 

 only thirteen or fourteen joints; but some of our native species 

 have twenty-two joints in the antennae. Upon this variation 

 I would arrange those now to be described in two groups. 



I. Antennce 14-Jointed; eyes very prominent^ with a project- 

 ing ridge between them^ formed by a horizontal extension of the 

 fiat top of the head; thorax prolonged beyond the extremity of 

 the body. 



21 



