170 EEV. A. E. EATON ON EEOENT EPHEMEEID^ OE MAYFLIES. 



tips of tarsi cloudy. Wings and neuration hyaline ; the space included between the two 

 nervures of the hind wing subopaque. 



? . Thorax, and abdomen above, ferrugineo-piceous, or sometimes ferruginous ; venter 

 reddish Avhite. Pore femur always immaculate. 



Length of body, d 4-5, ? 3-5-6-5 ; exp. of wings 9-12 ; sette, J 7-5-10, ? 5-9 mm. 

 [After Walsh.J 



Sab. liock Island, 111. 



Baetis ptgm^tts, Hag. 



Chi' pygnuea, ! Hag., Smithsou. Miscell. Coll. (1801) Syiiop. Neuropt. N. Am. 54 ; id., Vvoc. Ect. 

 Soc. Philad. ii. 178 (18G3). 



Baetis pygmceus, Etu., Trans. Ent. Soc. Loudon (1871) 122. 



Imago [dried), ? . — Thorax dark fuscous ; " abdouien fusco-griseous " (Hag.). Wings 

 vitreous, with brownish neuration ; fore wings with 6 simple straight cross veiulets, but 

 no granulations, in the pterostigmatic sj)ace. " Legs and setae white" (Hag.). Length 

 of body, ? 3, expanse of wings 6 mm. 



Hah. Tlie St. Lawrence. The type reached me in an extremely fragmentary con- 

 dition. [No. 79 in Hag. Mus.] 



CENTRAL AND SOUTH AMERICAN SPECIES. 



Baetis Salvini, sp. nov. Plate XVI. 29rt (wings and forceps). 



Stibimaffo {dried). — $ . Wings very light sepia-grey, with pitch-black neuration 

 bordered with darker (Cologne earth) grey, the bordering ti'ansversely confluent here 

 and there so as to form in the fore wing several (0-8) narrow fascitc, some of which have 

 a tendency to combine with one another in the vicinage of the most salient part of the 

 curve of the terminal and inner margin ; the marginal area contains usually 1 cross 

 veinlet before the buUa, and 15-18 beyond it, which last are oblique, strong, and for the 

 most part simple. 



Imago (dried). — 6 . Thorax fusco-luteous above, the metanotum piceous. Abdomen 

 discoloured, perhaps flavescent or else light olivaceo-fuscous, with the apical borders of 

 the segments pitch-black. Setae very light sepia-grey, with about every fourth joint 

 darker, annulated at every joining with sepia-brown. Wings vitreous : the fore wing 

 Avith pitch-black neuration, the stronger nervures fuscescent towards the wing-roots ; the 

 membrane with a patch of that colour at the base of the wing, and most of the stronger 

 cross veinlets bordered with the same, their borderings more or less confluent in the 

 pterostigmatic space and the subjacent portion of the submarginal area. Pore femur 

 light fuscous (light bistre-brown) banded with pitch-black near the middle and at its 

 extremity; tibia and tarsus flavescent, the tibia just at the base and more broadly at its 

 extremity, the tarsal joints annulated distally, and the ungues coloured throughout with 



