EEV. A. E. EATON ON RECENT EPHEMERED.E OR MAYFLIES. 41 



becoming darker in segments 8-10 ; the remainder (midst) of the back chiefly blackish- 

 grey, having joinings 1-3, and a small elongated spot on each side in segments 4-8 pale ; 

 joinings 4-7 darker grey. The dark colour projects obliquely downwards as a line from 

 the hind border in segments 1 and 2, and as a short stripe bounded in front by a pale 

 line ascending from the spicular border in segments 3-5 or -6 ; the same dark colour, in 

 segments G- or 7-10, occupies nearly the whole dorsal surface, but the same pale lines 

 from the spicular border project upwards into it in segments 7-9. Seta; white, tinged 

 very faintly with light grey near the base. Eore legs blackish-grey, with pale joinings ; 

 hinder legs luteous. Wings transparent, their neuration pale distally, but nearer the base 

 (the costa, subcosta, and radius especially) tinged with violet-grey; the same colour 

 imparts a light tint in the fore wing to the proximal portion of the marginal and sub- 

 marginal areas, and also to the space enclosed by the first axillary and the inner margin. 

 Length of body 8, wing 10, setse 35 mm. 

 Bah. Para (Brit. Mus.). 



Campsurus decoloratus. Hag. 



Palingenia decolorata, ! Hag., Smithson. Miscell. Coll. (1861), Synop. Neuropt. N. Am. 43.. 

 Hexagenia decolorata, Etu., Trans. Eut. Soc. London (1871), 65. 



Imago (in alcohol). — Luteous ; antennae pale ; mesothorax yellowish-fuscous ; abdomen 

 striped at the sides with obscure fuscous ; sette luteous. Tore legs blackish ; hinder 

 legs luteous. Wings transparent, yellowish ; neuration luteous, excepting the fuscous 

 subcosta of the fore Aving. Length of body 16, exp. of wings 30, setae about 30 mm. 



Jlab. Mexico ; Matamoras, Tamaulipas, common (Mus. Comp. Zool. Cambridge, 

 Mass.). [After Hagen.] The specimen seen by me was a female. Specimens from the 

 same localities could be readily identified by the colour of the fore legs, and by the 

 dimensions &c. quoted. In M'Lach. Mus. are several ? examples of a Campsurus 

 taken by Belfrage in Bosque Co., Texas, which has the fore legs yellowish like the 

 hinder legs. 



The fore wing of this Texan species is figured by me in Trans. Ent. Soc. London (1871), 

 pi. i. 3, the hind wing in the present work (PI. V. 8 b). In the absence of the 6 it is 

 well to leave it undescribed and nameless. 



Campstjbus dorsalis, Burm. 



Palingenia dorsalis, Burm., Haudb. d. Ent. Bd. ii. Abth. ii. 803, 1015 (1839) ; Pict., Hist. Nat. 

 Nevropt. ii. Epliem. 153, pi. xiii. 5 (1843-5); Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 549 

 (1853). 

 Asthenopus dorsalis, Etn., Trans. Eut. Soc. London (1871), 59. 



Imago, ? [after Pict.].— Pronotum yellowish, with a violet line or spot in the middle ; 

 the rest of the thorax yellow-ochreous at the sides, violet above, with a pair of lutescent 

 lines in the middle. Abdomen ochraceous grey, with a median fuscous streak tapering 

 behind. Sette whitish. Pore legs black-grey. Wings almost colourless ; costal region 



SECOND SERIES. — ZOOLOGY, VOL. III. 6 



