146 FAMILY EVANIID^. 



" The proportions of the petiole, abdomen and posterior feet of 

 this insect are nearly the same with tliose of appeiidigasfor Fabr. 



1 obtained a specimen near the Rocky Mountains, and it is also 

 found in Pennsylvania. The additional nervure is sometimes con- 

 nected with the radial cellule by a faint, transverse nervure, so as to 

 form a second cubital cellule." 



In semceoda the thorax is coarsely and thickly punctured ; in 

 appendigaster it has very few small punctures. In semacoda the 

 mesopleurse have the upper half smooth, a character that would not 

 likely have been overlooked by Say; in appendigaster the upj)er 

 part of the mesopleurie is only slightly less punctui-ed than the 

 lower part. It is characteristic of semceoda as well as other species 

 of Evaniella that the " nervure passing from the dividing nervure 

 of the cubital and discoidal cellules to the posterior margin of the 

 wing" (M14-2 fi'iid Ml) as well as the "faint transverse nervure" 

 connecting it with the radial cellule (R4), "so as to form a second 

 cubital cellule," and also m-cu and M are always and invariably 

 atrophied (Fig. 83). In appendigaster and other species of Evania 

 these veins are present, just as described in the description of 

 unicolor, but in occasional specimens of ajypendi.g aster only, so far 

 as I have observed, is R4 present, and then always partly atrophied, 

 so as to appear, as Say says, as a " faint transverse nervure." The 

 pi'oportions of the posterior feet of seiiueoda are not the same as in 

 appendigaster. In semceoda the metatarsus is about as long as joints 



2 -|- 3 -)- 4 together, in appendigaster only as joints 2 -|- 3. The 

 joint bearing the claws is much longer in appendigaster than in 

 semceoda. 



Inasmuch as appjeadig aster was a European species, it is highly 

 probabte that Say would not have identified his specimens with it 

 even if they agreed. He points out no difference between unicolor 

 and appendigaster, and we have no evidence that he knew appendi- 

 gaster from anytiiing except description. On the other hand it is 

 possible that unicolor may rej)resent a native American species 

 which is at present unknown to us. 1 have seen no specimen of 

 appendigaster or semwoda from west of Georgia and Ohio, whereas 

 Say described unicolor from the Rocky Mountains. 



The red form of sonceoda has been in collections as Evania doi'sa- 

 lis Westwood. 



Hah. — Massachusetts (Woods Holi, C T. Brues) ; New Jersey 



