EPHE3IERIN.E. 563 



Yellowish white: head sessile; vertex ferruginous: thorax 

 with two ferruginous vittae, confluent before and becoming obsolete 

 behind : setae with black rings, hardly longer than the body : legs 

 white; fore-femora ferruginous at the tips; tips of the fore-tibiae 

 and of the joints of the fore-tarsi brown : veins of the wings except 

 those of the margin, black; hind-wings not extending beyond the 

 fourth abdominal segment. Length more than J of an inch. 



Indiana. 



26. Baetis obesa. 



Brevis ; alee niyricantes, maculis una magna plurimisque parvis 

 hyalinis. 



Baetis obesa, Sat/, Journ. Acad. Nat. Set. Phil. viii. 43, 4. 



Subimago. — Very short and robust, blackish livid : borders of 

 the abdominal segments dull rufous, livid : setae very short, hairy, 

 with black rings: legs pale yellowish ; tips of the joints of the tarsi 

 black : wings dark brown or blackish, with numerous small, trans- 

 verse, hyaline spots or abbreviated lines, and a large, hyaline, very 

 oblique semifascia about the middle on the anal half: hind-wings 

 with numerous transverse abbreviated hyaline lines, which do not 

 extend to the apical margin. Length over T |ths of an inch. 



Indiana. 



27. Baetis luridipennis. 



Fusca ; abdomine cingulato ; alis luridis fusco venosis. Long, 

 mar. 7 lin.; foem. 9$ lin. 



Baetis luridipennis, Burnt. Handb. Ent. ii. 2, 801, 7. Pictet, Hist. 

 Nat. Neur. Eph. 192. 



North America. 



B. luridipennis ? Male. — Tawny: antenna? brown, tawny at 

 the base: abdomen with brownish bands on the sutures of the seg- 

 ments, less than twice the length of the thorax : setae whitish, very 

 minutely pubescent, a little more than twice the length of the body : 



3 c 2 



