REV. A. E. EATON ON EECENT EPHEMEEID^ OR MAYFLIES. 101 



Etymology. jSAatrTovw and ov^a, from the median caudal seta resembling one that is 

 sprouting forth and not fally developed. 



The wings of Blasturus figured in PI. XI. belonged to a large specimen ; in those of 

 smaller examples the branchlets of the nervures along the terminal margin are less 

 intricate, as a rule, and similar to those shown in the illustration of Leptophlehia. The 

 nymphs were communicated to me by Dr. Ilagen, and were identified generically mainly 

 by the wing-neuration and stature of specimens of mature growth, taken into consideration 

 with their native localities. No aid towards the discrimination of the species described is 

 afforded by the shape of the penis in the dried insects. 



Blasttjrus ctjpidus. Say. Plate XI. 18 (adult wings and legs), XXXIII. (nymph?). 



Ephemera cupida. Say, West. Quart. Rep. ii. 163 (1823) ; Lc Contc, Complete Writings of T. Say, i. 

 173 (1859).— i;. Hebes, Walk., List of Neuropt. Ins. in Brit. Mus. part iii. .538 (1853)?. 



PaUngenia pallipes ! & concinna, ! Walk., op. cH. 553 (1853). 



Potamanthus cupidus & concinnus, Hag., Smithson. Miscell. Coll. (18G1), Synop. Neuropt. N. Am. 51; 

 (cupidus), Walsh, Proc. Acad. Nat. Sc. Philad. (1862), 372; Hag., Proc.Ent. See. Philad. ii. 172 (1863). 



XBa'etis ignava ! Hag., Smithson, &c. 47 (1861). 



Leptophlebia cupida (part), ! Etn., Ti-ans. Ent. Soc. London (1871), 89, pis. ii. 26 & iv. 29-29 <!- 

 [details] . 



Blasturus cupidus !, Etn., Ent. Mo. Mag. xvii. 193 (1881) .—B. concinnus, ! id., in the writing of PL XL 



Subimago {dried). — Wings light sepia-grey, with dark nem-ation, but with the mem 

 brane and neuration at the wing-roots and in the axillary area of the fore wing, and to a 

 larger extent at the base of the hind wing, paler or even dull yellowish whitish, especially 

 in the ? . Median seta in 6 rather more than I as long as the outer seta?, and so in the 



? , but in a less degree. 



Imago {dried). — Median seta about J as long as the outer setae in the 6 , and about ^ 

 in the $ . Pterostigmatic portion of the fore wing tinged slightly with brownish in the 



6 ; marginal area in the 6 with 9-15 (commonly 10) cross veinlets before the bulla and 

 27-33 beyond it, but in the ? 9-13 before and 19-23 beyond (counting along the sub- 

 costa) ; those in the pterostigmatic region rather irregular, somewhat curved, and some- 

 times forked and anastomosing near the costa. 



d . Thorax pitch-black, varied at the sides and beneath with rufo-piceous. Abdomen 

 discoloured ; dorsum pitch-brown, with narrow yellowish joinings, sometimes varied with 

 rufo-piceous in aged cabinet specimens, often in some degree translucent in the midst ; 

 venter in segments 2-8 pale dull rufo-piceous or subtestaceous, segment 9 rufo-piceous ; 

 forceps dull yellowish brown or rufo-testaceous, sometimes darkened distally. Fore legs 

 dark pitch-brown, the tarsi sometimes lighter ; hinder legs in opaque view either light 

 pitch-brown or (in a specimen from Milford, N.H.) dull bronze-brown, changing in 

 transmitted light to deep amber and light yellow-amber respectively. Wing-neuration 

 light pitch-brown, changing in transmitted light to rufous or light amber; the cross 

 veinlets before the bulla in the marginal area of the fore wing very indistinct. 



$ . Head rufescent, the vertex with a large pitch-black blotch in the midst on the 

 occipital border, and another about the ocelU. Thorax piceous above, the pronotum 



SECOND SERIES. — ZOOLOGY, VOL. III. ^"^ 



