PLANT-LOrsE — VARIETIES. 55 



but little shorter and more slender than the third, whilst the sixth is but half as long, 

 and the seventh is double the length of the six'h, and quite slender and thread-like. 

 The abdomen is short and thick, of an 6val form, and obtusely rounded At its apex, 

 of a bright grass-green color, with a row of black dots along ^ach side forward of the 

 nectaries, one dot upon each segment. On its under side at the tip, are two square 

 brown spots, more or less separated from each other as the abdomen is distended 

 with aliment in a greater or less degree, and above the apex are often three short 

 blackish transverse stripes. The tall -like appendage in the female is black, and about 

 a third as long as the nettaries, which are also black, and if pressed against the ab- 

 domen, would reach its tip in the females, but are shorter in the other s6x. The legs 

 are pale dull yellow or whitish, with numerous even hairs; the feet, tips of the 

 shanks, and of the thighs, black or dusky; the hind thighs black, except upon their 

 basal third. The wings are transparent, but not perfectly pellucid, the stigma or 

 opake spot towards the end on the outer margin, is dull white, and the veins are dark 

 tawny brown, the longitudinal rib-vein being paler and becoming whitish towaids its 

 base, the third or forked vein is abortive and colorless at its base, and, as in many 

 other species, the first vein has a dusky mark from its tip. running upon the margin, 

 towards the base. The first and second veins are more than twice as far apart at' 

 their tips as they are at their bases; the third vein. is slightly farther from thesecond 

 at its tip than at its base, and is a third farther, or more, from the second at base 

 than this is from the first; the tip of the first fork is much nearer the tip of the 

 second fork than that of the third vein, and is about the same distance from the tip 

 of the third vein that this is from the second ; the tip of the second fork is equidis- 

 tant between the tips of the first fork and the fourth vein ; the tipof this last is com- 

 monly twice as near the tip of the second fork as it is to that of the rib-vein. 



Individuals have been observed, in which the wing-veins varied from their normal 

 state as follows: 



1. Tip of the third vein nearer that of the first fork than that of the second. 

 Common. 



2. The second and third veins parallel with each other. 



3 The second fork very shorif, its tip only half as far from the tip of the first fork 

 as from that of the fourth vein. 



4. Left wing with but one fork to the third vein, the second wanting. 



5. Right wing with three forks to the third vein. 



6. Left wing with the second vein slightly forked at its tip. 



The. following vaeieties in the colors and marks of this species may be specified. 

 The greatest diversity in these resiiects occurs after the coming on of frofty nights in 

 autumn, it being then difficult to find two individuals with precisely the same hiie 

 and marks. This diversity is undoubtfdly produced by the cold to which the insects 

 have been exposed, and the unhealthy juices of the faded and decaying leaves which 

 now furnish the only nourishment which is accesfible to them. It might hence be 

 deemed that the whole race was now in a diseased state, if it were not that sexual 

 intercourse takes place freely, and the females are all industriously occupied in de- 

 positing their eggs. 



Variety a, pallidicornis. The antennae brownish yellow instead of black. Young 

 individuals. 



