EEV. A. E. EATON OX RECENT EPHE.AIERID.E OR MAYFLIES. 147 



Si(U)nago {dried), 2 .—More delicate and slender than C. halterata and C. lactella. 

 Head and thorax grey, witli silvery reflections, the prothoras a little lighter. Abdomen 

 grey at the base and brilliant white at the tip. Fore legs grey ; liinder legs brilliant 

 white. Setae white, faintly auuulated with blackish. Wings slightly greyish, the sub- 

 costa and radius black. Length of body -i, setae 3 ; expanse of wings 8 milUm. 



Hah. Sicily (after Pictet). 



C.EXIS HiLAKis, Say. 



Ej^hemera hilaris, Say, Jouru. Acad. Nat. Sc. Philad. viii. 43 (1839) ; Le Coute, Complete Writings 

 ofT. Say, ii. 413 (1859). 



C(Bnis hilaris, Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 583 (1853) ; Hag., Smithson. 

 Miscell. Coll. (1861), Synop. Neuropt. N. Am. 54; Walsh, Proc. Acad. Nat. Sc. Philad. (1862), 381 : 

 Hag., Proc. Eut. Soc. Philad. ii. 179 (1863) ; Etn., Trans. Ent. Soc. London (1871), 96. 



Imago (abstract after Say). — Thorax pale fulvous. Abdomen white ; each of the 

 apical segments with three fuscous dots on each side. Length of body 2 millim. 

 Hub. Indiana ; September. 



CzENIS DIMINUTA, Walk. 



Canis dimimita, ! Walk., List of Neuropt. Ins. in Brit. Mus. part. iii. 584 (1853) ; Hag., Smithson. 

 Miscell. Coll. (1861), Synop. Neuropt. N. Am. 55; ! Etn., Trans. Ent. Soc. London (1871), 95.— 

 C. arnica, Hag., Smithson. Miscell. Coll. (1861), Synop. Neuropt. N. Am. 55. 



Imago {dried), <s . — Thorax above for the most part bronzy brown-ochreous. Abdomen 

 whitish, varied with grey anteriorly on the back, posteriorly yellowish white ; the joinings 

 of the segments and a dark longitudinal line near the spiracular border on each side of 

 the back in the intermediate segments black. Genitalia and setai white. Wings trans- 

 parent whitish grey ; the subcosta and radius purple-black to beyond the middle. Legs 

 whitish: the fore femur warm sepia-grey, with a dark spot above close to its distal 

 extremity : hinder femora dull whitish, with a grey band or a black spot on their uppei- 

 part just before the knee. Length of body, c^ 2-2-5, wing 3, setae 10 millim. 



Hab. St. John's Bluif, East Florida (E. Doubleday; Brit. Mus.); Pennsylvania 

 (Zimmermann ; Berlin Mus.). By using a lens of suitable power, instead of a Coddington, 

 I can distinguish the femoral spots or bands in Walker's type, which formerly were sup- 

 posed by me to be lacking, but were mentioned by Hagen in his description of C. arnica. 

 He indicates perhaps a distinct species from the same locality (Pennsylvania) in the 

 Berlin Museum, with a yellow thorax, whitish yellow abdomen, and white legs, grey at 

 the distal extremities of the fore femur and tibia. 



I have seen several other N. -American species of Cceuis, but have left them, to be 

 described by entomologists resident in that country. 



Cj5Nis perpusilla, Walk. 



Canis perptmlla,\ Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 585 (1853); Hag., Verh. zool.- 

 bot. Gesells. Wien, viii. 477 (1858) ; ! Etn., Trans. Ent. Soc. London (1871), 96. 



Imago {dried), d .— " Testaceous; " wings transparent, the marginal and submarginal 



