40 NEW YORK STATE MUSEUM 



marginal notches from the two other lesser lobes (pl.8, fig.8) . The 

 middle lobe of the lower lamella is likewise flat, ibut narrow, 

 linear, and with a Ibetter development of the two other lobes at 

 its base. There is a slight decrease in leng-th on segiments 2-7; 

 and on 2, and again on 7, the anterior of the three lobes of the 

 ux)iper lamella is scarcely developed. Setae three, fragile, slender, 

 with minute apical whorls of sipinules on the segments. 



Color olivaceous brown above, with a variable middle pale line, 

 fenestrate upon the dorsum of the abdomen with paler olivaceous. 

 Below, with a /broad pale median area. 



Several of my nymiphs from Fall creek have colonial Vorticel- 

 lidae attached promiscuously about the dorsum, or aggregated 

 about the bases of the setae. 



Pl.8, fig.l, shows the venation and fig.2 of the same plate shows 

 the form of the appendages of the male imago in this species. 



Baetis pygmaea Hagen 



This dainty little mayfly, which I described in bulletin 47 (pp. 

 421-423, pi. 15, fig. 13 and 14), I bred also from nymphs obtained 

 in Fall creek with those of the preceding species, and I took a 

 few specimens of the imagois in trap lanterns hung about the 

 creek during July 1901. 



Callibaetis skokiana Needham 



I wish to record here concerning this species that I have made 

 a careful examination of microscopic mounts of the stomach con- 

 tents of ten well-grown nymphs taken from the Gym pond on the 

 campus of Lake FoTest College in Illinois, and have found them 

 containing no recognizable animal remains whatever, but only 

 remains of plant tissues, chiefly the disintegrating fragments of 

 the dead leaves of the higher plants, such as litter from the 

 pond bottom, with a scanty sprinkling of algae — C y a n o p h y- 

 c e a e and stalked diatoms. 



Blasturus cupidus Say 



I have found his species common in Six Mile creek at Ithaca, 

 where I bred it in 1897. I have apparently identical nymphs in 

 my collection from Elkhart, Indiana, and Raleigh, North Caro- 

 lina. The imagos of this genus appear in late spring. As be- 

 fore remarked. Berry has described the nymph in the American 



