612 PROCEEDINGS OF THE ACADEMY OF [NoV., 



a black spot in front of the ocelli, and the vertex mostly dark in the 

 middle; antennae minutely hairy, the second joint about as long as 

 the distance between the eyes. Thorax black, a yellow Y-mark 

 in front; legs brownish yellow; wings hyaline, veins dark, vein 

 closing the cell and base of radial fork whitish hyaline, a dark dot 

 at base of the stigma, the stigma very long, much longer than the 

 longest side of the cell, very low and evenlj^ rounded behind, almost 

 wholly blackish, dark dot at end of anal vein. The cell about once 

 and a-half longer than broad at base, four-sided, tip about one-half 

 ■of base. Length 4 mm. 



From Cambridge, Mass., September, Franconia, N. H., Bear Mt., 

 Salisbury, and East River, Conn. (Ely). 



Caecilius posticus n. sp. PI. XXVIII, fig. 15. 



Body dark, perhaps discolored; legs and antennae pale yellowish. 

 Wings hyaline; fore wings mostly dark on basal part, but some pale 

 near base, and on costal area, and behind. A streak runs down the 

 cubitus to the areola postica; the upper branch of the radial sector 

 is also margined with dark brown, and the three marginal cells also 

 dark brown, the brown extending into the areola postica. The 

 upper branch of the radial sector runs more vertical than usual, 

 ending just beyond the stigma; the latter long and slender, unmarked. 

 Hind wings are hyaline. Length 2.7 mm. 



From Sea Cliff, N. Y., in August. 



Caecilius umbrosus n. sp. 



Yellowish; nasus and clypeus dark brown, a brown, median streak 

 on face and vertex; the antennae pale; legs pale; thoracic notum dark 

 brown; abdomen mostly pale, dark at tip. Wings pale brown, rather 

 darker near veins and toward tip, stigma also darker; venation 

 brown, the vein at base of anal cell hyaline white. Second joint of 

 antennae not as long as vertex width in female, in male one and a 

 fourth longer, third joint two-thirds as long as the second. Wings 

 rather long, stigma large, about three times as long as Avide, nearly 

 angulate behind, the two parts of the pedicel of radial fork subequal 

 in length, anal cell plainly longer than high. Length 3 mm. 



From Hillside, Fulton Co., N. Y. (Alexander), and Sea Cliff, 

 L. L, N. Y. 



EPHEMERIDuE. 

 Anagenesia greeni n. sp. 



Grayish yellow; abdomen blackish above, thoracic notum dark; 

 front legs mostly gray, others pale yellowish, setae white, with 



