220 EEY. A. E. EATON ON EECENT EPHEJIEEID^ OR MATrLIES. 



Imago. — 6 . [Eyes in life pitcli-brown, intersected by a black line at their lowest \ : 

 Walsh.] — {Dried). Notum light raw-umber brown, darker along the middle. Dorsum of 

 the abdomen bistre-brown, varied with dull whitish yellow in segments 3-9 ; the lighter 

 coloiu" in segments 3-8 forms an acute triangle at the base of every segment on each side 

 about half as long as the segment [two triangular yellowish spots, more or less confluent, 

 sometimes extending to the dorsum, in segments 2- or 4-9 (Walsh)]. Venter extremely 

 light ochraceous, with intense burnt-umber brown markings in segments 2-8, viz. : — in 

 each segment two longitudinal stripes, a pair of dots, and a spot or streak ; in segments 4-8 

 the longitudinal stripes extend from near the hinder lateral angles of the segment almost 

 to the base, are gently curved outwards posteriorly, and are slightly convergent towards 

 each other in front ; in segments 2 and 3 the stripes are confluent at the base of the 

 segment ; in segments 2-8, between every pair of stripes, is a pair of dots placed trans- 

 versely not quite in the middle of the segment, and these are followed at a short distance 

 in the same segment by an abbreviated streak or lanceolate spot, half overlain at the 

 joining by the margin of the segment, and half projected into the following segment. 

 Setse ochraceous, with piceous joinings. [Fore legs pale brown (Walsh).] Hinder legs, 

 in opaque view, ochraceous ; a broad band before the extremity of the femur, the extreme 

 base of the femur, the knee, the joinings of the tarsal joints and tibia, and the ungues, 

 intense burnt-umber brown. Wings vitreous, with pitch-brown neuration ; the bistre- 

 grey tint formerly attributed to the pterostigmatic region is now no longer visible. 



$ . Anterior and lateral edges of the vertex, and sometimes the median line, as weU as 

 two abl)reviated vittse on each side of it, yellowish. Abdominal markings occasionally 

 indistinct \_teste Walsh]. Length of body 10-13 ; wing, d 11-14, ? 12-16 ; setse, 6 

 im. 18-31, subim. 13, ? im. 18-19, subim. 14-15 mm. 



Sab. Trenton Falls, N. Y. (Brit. Mus.) ; Rock Island, 111. (Walsh) ; North-west Ter- 

 ritory (Say); Quebec, Ca. (Provancher). 



SiPHLURTJS FEMORATUS, Say [uot Etu., in PI. 18]. 



X Ba'etis femo7'ata, Say, Godman's^West. Quart. Eep. ii. 162 (1823) ; LeConte, Comjjlete Writings of 

 T. Say, i. 171 (1859) ; Hag., Smitlison. Miscell. Coil. (1861), Syuop. Neuropt. N. Am. 48 ; Walsli, Proc. 

 Acad. Nat. Sc. Pliilad. (1862), 368?; Hag., Proc. Ent. Soc. Pliilad. ii. 169; Walsh, o;?. d^. ii. 188? 

 (1863).— 5. mterUneata, id., op. cit. 190? 



Siphlurus femoratus , Etn., Trans. Ent. Soc. London (1871), 128. 



StiMmago. — Wings coloured exactly like those of Hexagenia hilineata [see p. 50, ante\ 

 the bordering of the cross veinlets along the anterior margin of the fore wing forming 

 three dark clouds, of which the intermediate, situated about the bullae, is the most 

 distinct. Sette pale brown, with brown joinings. 



Imago (licing). — d . Eyes pearly whitish above, with a movable black dot ; then' lower 

 |- (separated by a definite line from the whitish part) pale dusky. Notum piceous. 

 Abdomen in segments 2-6 transparent whitish, each of them, above, bordered narrowly 

 with piceous at the terminal margin, marked in the middle on each side with an obscure 

 oblong spot, and slightly pulverulescent with piceous along the upper part ; segments 7 

 and 8 of the dorsum piceous, each with a semi-oval whitish spot at the base on each side 



