298 EEY. A. E. EATOX ON EECENT EPHEMERID.E OR MAYFLIES. 



Heptagenia I PUDiCA, Hageu. 



Heptagenia Xpud'ica [ ? subim.l, ! Hag., Ann. Rep. U.S. Geol. & Geograph. Survey of the Terr. 1873, 

 part iii. Zool. 581 (1875) ; [uec % Ephemera pu die a, ! Hag. {\'6Q\) =Ecdijurits vicarius]. 



SuUmago (dried), ? . — The two specimens supposed in 1875 to be identical with the 

 species described in 1861 as Kjmdicn differ from this last specimen, but agree with each 

 other in the following particulars: — In the tarsus, joint 1 is tlie longest, joints 2-4 

 diminish successively in length, and joint 5 is as long as (if not longer than) joint 1 ; 

 ungues unlike each other in form. Wings talcose, grey-tinted in the disk, and slightly 

 yellowish along the costa ; longitudinal ncuration at first flavescent, and banded with 

 greyish black, but becoming in a large extent darker before the moult ; cross-veinlets 

 pitch-black, mostly bordered faintly with grey, this colour also spreading along the lon- 

 gitudinal nervures in the vicinage of their junctions with the former : near the anal angle 

 of the fore wing many of the cross-veinlets are at first pale and unbordered, but after a 

 time they become dark like the others. The wing-neuration is comparable to that repre- 

 sented in PL XXIII. fig. 41, the cross-veinlets being rather evenly distributed in the 

 disk ; the marginal area of tlie fore wing contains 9-11 cross-veinlets before the bulla, 1 

 or 2 at the bulla, and about 20 rarely forked beyond it. Notum lutesccnt. Abdomen 

 striped obliquely at the sides with black, and marked at the bases of most of the ventral 

 segments with two fine divergent black lines. The ventral lobe of segment 9 appears 

 to be obtuse behind, with a slight sinus in the middle closely flanked on either side by 

 a small acute tooth. The specimens w^ere ticketed 82 and 83 ; and the left hind leg of 

 82 was atrophied. Length of wing 20 mm. 



IFab. Foot-hills, Colorado (W. L. Carpenter) in August. (Mus. Comp. Zool. Cam- 

 bridge, Mass.) This species may be related generically to Ej^eo^'us. 



Heptagenia basalts, "Walker. 



X Ba'ftis bcisfilis, ! Walk., List of Ncurnpt. Ins. in Brit. ]\Ins. part iii. 505 (18.J3) ; Hag., Smithson. 

 Misceli. Coll. (18G1) Synop. Ncuropt. N. Am. 50 ; [ncc B. bascdis, Stepli., Cat.]. 



Heptagenia hasalis, ! Etn., Trans. Ent. Soc. London (1871) 139, pi. vi. 15, 15 a [detail]. 



Imago (dried), <s . — Xotum piceous. Abdomen pitch-brown, pale at the joinings. Setae 

 very light reddish [Roman] sepia-grey, with pitch -brown joinings. Legs absent. Wings 

 vitreous, with pitch-black neuration : the fore \\ing towards the inner margin, and the 

 hind wing at the base, tinged with dark vandyke-grey ; the cross-veinlets in the disk of 

 the fore wing near the base of the wing, and between the costa and the pobrachial (7) 

 nervure, are narrowly edged with pitch-brown, or, in parts, with pitch-black ; their edging 

 in two places coalesces into pitch-black spots, situated one at the bulla of the subcosta, 

 and the other about midway between that and the extremity of the marginal area. 

 Length of body 13, wing 14, setre 25 mm. 



Hab. Lake Winnipeg (Brit. Mus.). 



