220 THOMAS SAY FOUNDATION 



General color dark brown. 



Head much wider than prothorax; hind ocelli closer to 

 eyes than to each other. Prothorax quadrangular, very 

 little wider than long, slightly narrowed behind, quite 

 rugose ; angles rather narrowly rounded. Wings subhy- 

 aline, with two transverse darker bands; anal field of 

 hind wings large. Gills apparently absent. 



Male. Subanal lobes hardly modified ; cerci membra- 

 nous; inserted low on the side; just above each cercus a 

 large chitinous process, covered with heavy spines, pro- 

 duced backward and inward ; supra-anal process short en- 

 larged, ending in complex lobes and chitinizations ; sub- 

 genital plate short ; ventral lobe circular, about as wide as 

 long. 



Female. Seventh sternite unmodified; eighth sternite 

 somewhat swollen in middle and slightly produced into a 

 subgenital plate. 



Holotype, male, allotype, female, April, Waldeboro, 

 Me. (Cornell University Collection) ; June 4 and April 

 25, Waldeboro, Me.; one male, March-May, Waldeboro, 

 Me. (J. H. Lowell) ; one male, March 12, Orono, Me. 



Nemoura stigmata Banks. 



(Plate 39, figs. 15-17.) 

 1900. Nemoura stigmata Banks, Trans. Am. Ent. Soc, 26:244. 

 1907. Nemoura stigmata Banks, Cat. Neurop., p. 14. 



Length to tip of wings, male, 16 mm. Expanse, male, 

 28 mm. 



General color dark brown. Head a little narrower than 

 prothorax; nearly uniformly dark brown except for a 

 small lighter depressed area between the hind ocelli and 

 the eyes; hind ocelli twice as close to eyes as to 

 each other ; antennae dark brown. 



Prothorax wider than long, somewhat widened behind ; 

 front angles narrowly rounded, hind angles quite sharp ; 

 surface hardly rugose; a darker longitudinal band each 

 side of the median line. Legs brown ; femora darker at 

 the tip. Wings subhyaline with an elongate dark spot be- 

 yond the stigma. 



Male. Ninth sternite with two prominent rounded 

 knobs; subanal lobes modified into very long, slender, 

 chitinous, processes which recurve over the abdomen 

 where they fit into the supra-anal process which also re- 

 curves and is chitinized ; cerci long and slender but not 

 strongly chitinized; subgenital plate not much produced; 

 ventral lobe heavily chitinized and spine-like. 



Female. Unknown. 



