MAY PLIES AND MIDGES OP NEW YORK 43 



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

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

 since described and figured as characteristic of Ephemerella 

 grand is Etn (Monograph, pi. 14, fig.24&). 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 

 of E . g r a n d i s 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 images, a male 

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

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

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



Imago. Length, 9 mm.; Aving, 9 mm.; setae of 5, 10 mm. (of (^ 

 wanting) ; of J^ subimago, G.5 mm. 



Male imago deep brown, varied with olive green. Antennae 

 brown ; a Avhitish 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 10th segment Avhicli is yellow- 

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



