EEV. A. E. EATON ON EECENT EPHEMEEID.E OR MAYFLIES. 299 



Heptagenia pulchella, AValsb. 



J PnUngenia puhhdla, Walsh, Proc. Acad. Nat. Sc. Philad. (18G2) 375 ; Hag., Proc. Eut. Soc. Pliilad. 

 ii. 177 (1863) ; Walsh, op. cit. ii. 203 (1863). 



Heptagenia pulchella, Walsh, op. cit. ii. 204. (1863) ; Etn., Trans. Eut. Soc. London (1871) 141. 



Suhimago. — Wings subopaque, clouded with fuscous ; cross-veiulets fuscous, bordered 

 with fuscous ; hind wings paler than the fore wings, and tipped with fuscous. 



Imago [living), H' . — Fore tarsus \\ to 1^ as long as the tibia; joints 1-3 of the tarsus 

 subequal to each other. Ejes pearly Avhitish, changing to blackish. Notuiu ferrugineo- 

 pieeous, with the meso- and metathoracic scutella whitish. Abdomen, in segments 2-7, 

 and the base of segment 8, whitish hyaline, with the extreme terminal edges of the seg- 

 ments dark, and usually with a large fuscous dot at each of the spiracles ; the remainder 

 of the dorsum ferrugineo-piceous. Venter whitish. Setae whitish, with fuscous joinings 

 alternately narrow and broad in the basal half. Fore leg pale yellowish; the femur with 

 a median and a terminal baud, the tip of the tibia, and the joinings and tip of the tarsus 

 fuscous : hinder legs whitish, marked palely in correspondence, wanting sometimes the 

 median femoral band. Wings hyaline, clouded with pale brown in the pterostigmatic 

 space of the fore wing: neuration for the most part fuscous, but the " costal veins " 

 [? subcosta and radius] in their basal f are yellowish, and in the hind wing the " post- 

 costal veins" [? those posterior to the pobrachial (7)] and cross-veinlets are hyaline. 



? . — Vertex whitish, varied with luteous or ferrugineous ; notum whitish, varied with 

 luteous ; sternum and pleura whitish. Dorsum and venter egg-yellow when full of 

 eggs; the dorsum marked in joints 1-G as in 6 , and slightly tinged sometimes in seg- 

 ments 7-9 with ferrugineous. The pterostigmatic cloud is lighter than in d ; and the 

 neuration of the hind wing is mostly hyaline. Length of body 5-8; setse, 6 im. 17-21, 

 subira. 10-13, £ im. 15-10, subim. 8-13 mm. 



Hah. Rock Island, 111., and Maryland. In the fore wing the great cross-vein is very 

 strong, and the cross-veinlets, especially in the front of the wing, are coarser thau the 

 longitudinal neuration. [After Walsh.] 



Heptagenia tekminata, Walsh. 



X Palingeiiia terminata, Walsh, Proc. Acad. Nat. Sc. Philad. (1862) 376 ; Hag., Proc. Ent. Soc. 

 Philad. ii. 177 (1863) ; Walsh, op. cit. p. 203 (1863). 



Heptagenia terminata [sp. ? or H. piilc/iella, var. ?],Etu., Trans. Ent. Soc. Loudon (1871) 141 note 

 [after II ag.] . 



J Bu'etis X interpunctata, Provancher, Natural. Canad. viii. 26G (1876) ; id., En. Eut. d. Cauad. ii. 

 fasc. i. 83 (1877) [corrected at op. cit. p. 82' (Hag. MS.)]. 



Perhaps only a variation of H. i)ulcliella. The 6 imago has segments 2-7 of the 

 abdomen pale yellowish, without dots at the spiracles ; the hinder legs pale yellowish, 

 usually wanting the median femoral band. In the fore wing tlie cross-veiulets are 

 scarcely coarser than the longitudinal nervures (whence the wing seems paler than in 

 H. pulchella) and the " second costal vein" [? subcosta or ? radius] is generally thickened 

 and clouded for the length of 0-5 mm. at the bulla, which is rarely so in H. pulchella. 



40* 



