MAY FLIES AND MIDGES OF NEW YORK 43 



specimen, is in perfect condition for showing the venation. It 

 shows the basal fusion of veins Cu 2 and 1st A that Eaton long 

 since described and figured as characteristic of E p h e m e r e 1 1 a 

 grand is Etn (Monograph, pl.14, fig.246). This character, 

 together with the rather strong joinings together of the other 

 anal veins basally, readily distinguished this large species from 

 Ephemerella proper. The figures of venation I give herewith 

 (pi. 10, figs. 1 and 2) are drawn from the nymphal wing, 

 which shows the venation better than does the single female 

 imago I have seen. I have another identical nymph collected at 

 Twin Lakes Colorado, by Mr Chauncey Juday. Since the type 

 ofE. grandis is from Colorado, it seems very probable that 

 the nymph belongs to this species. In pi. 10, figs.3, 4 and 6 I 

 present figures of the male nymph, which differs slightly from 

 the female, figured by Eaton. 



Ephemerella bispina sp. nov. 



The six specimens of this species that I have seen were sent 

 me in the last lot of -material received from the late Mr R. J. 

 Weith. They were collected at Elkhart Indiana, shortly before 

 June 18th the date on which they reached me at Lake Forest. 

 There were among them single male and female imagos, a male 

 subimago, and three nymphs. The species is apparently near to 

 E. walkeri Eaton from Albany river near Hudson's bay r 

 still so insufficiently known and to E . i.g n i t a Pol. of Europe. 



Imago. 'Length, 9 mm.; wing, 9 mm.; setae of g, 10 mm. (of $ 

 wanting) ; of $ subimago, 6.5 mm. 



Male imago deep brown, varied with olive green. Antennae 

 brown; a whitish ring around their bases. Thorax rich dark 

 brown above and on all carinae, greenish in the sutures and fur- 

 rows, excepting the median longitudinal furrow. Beside the 

 median prolongation of the hinder lobe of the mesothorax is a 

 pair of acute spines, each decurved at tip and about as long as 

 the space between them is wide. Wings subhyaline; veins pale 

 brownish, as is also the subcostal space. Legs brown, the femora 

 sprinkled with distinct blackish dots; fore leg dark, becoming 

 gradually lighter toward the tip ; middle and hind legs paler and 

 tinged with greenish ; claws all brown, the obtuse one of each pair 

 darker than the other. 



Abdomen pale brown, except the 10-th segment which is yellow- 

 ish, paler on the sutures and thereby appearing ringed; an in- 



