172 
[October 
ous; four hind legs brown. Wings hyaline, the terminal third of the 
anterior wings brown abruptly, the extreme border of the tip hyaline ; 
cross-veins hyaline, fuscous on the apical third; costal veins yellowish, 
the apical stigmatical part darker. Five S . 
Subimago S . Yery similar to the imago, but differs as follows:— 
the general color is the same, but not polished; setae shorter, without in¬ 
cisures, pilose, the middle one piceous and stouter than in the imago. An¬ 
terior wings similar to the imago, but the hyaline part dull or sublurid; 
posterior wings pale yellowish, the apical third grayish brown. One S . 
Imago, length S 9—11 mill. Expanse % 18—22 mill. Exterior 
seta S about 22 mill. Interm. seta S about 10 mill. Ant. leg S 
about 10 mill. 
Subimago, length S 9 mill. Expanse S 19 mill. Interm. seta S 
about 8 mill. Ant. leg S about 7 mill. 
The coloration of the wings in this species is almost like that of F. 
marginatus Zetterst., a very common species with us. On comparing 
my description of the specimens from Saskatchawan, I believe that 
they are identical with Potamanthus (palingenia) nehidosus Walker. 
In 1861 I noted in London that the wings of nehuhsus are brown on 
their apical one-third, so that Mr. Walker’s description agrees very 
well. I think P. odonatus Walsh, is also identical with this species 
from Saskatchawan. The character “with a definite outline” = the 
extreme tip hyaline. \_See note 13.] 
P. CUPIDUS Say, Walsh. (= Potamanthus [palingenia] concinnus 
Walker.) I have compared the 2^1? images from Washington, 
(April,) described by me as P. concinnus^ and they agree very well 
with Mr. Walsh’s description of P. cupidus % imago, except that they 
are a trifle bigger; but a third % imago received from Washington 
has exactly the same dimensions. I have also received two 9 subi- 
magos from Washington and Maryland, which are apparently P. con- 
einnus. Specimens of the subimago % 9 sent me by Mr. Walsh differ 
from Say’s description in the [4 posterior] tarsi not being black. \_See 
note 14.] I have also received from Mr. R. Kennicott from Saskatch¬ 
awan 2 'S 1 9 subimago of Pot. cupidus. As the species is said by 
Say to be common at Cincinnati about May 15th, it would be easy to 
verify it. 
1 received from Mr. R. Kennicott in 1860, from Saskatchawan, 6 9 
