EEV. A. E. EATON OX EECENT EPHEMEEID.E OE MATTLIES. 195 



fuscescent spot at the junction of the radius (3) with the subsequent two nervures of the 

 fore wing, and in the hinder legs the unirues, the last two tarsal joints, together with the 

 extremities of the other joints and that of the tibia, are black-brown : in one of them the 

 10th dorsal segment of the abdomen is pale. [Numerous specimens in Ha?., and in 

 M'^Lach. Mus.] 



Cailib^tis , sp. nov. ? 



Imago [dried), 6 . — Wings ornate in this sex, as strongly and nearly in the same 

 manner as those of C'.ferrugineus, 2 [compare PL XVI. 28 5]. Neuration of hind wing 

 less sparse than in that species, closely resembling that of the liind wing of C montanus 

 \loc. cit. 28 f/]. Legs much darker in colour than those of C.ferrugineus; the fore leg 

 quite as dark as that of C. Hageni, being, in opaque view, either light pitch-brown, or 

 warm sepia-brown, with the trochanter and base of the femur rather lighter; hinder 

 legs very light yellowish brown, almost whity-brown, marked in the femur with very few 

 and verv indistinct round dark dots, the tarsi duskv or corvinous. with the un2rues and 

 the terminal edges of the joints black. Abdomen intense warm sepia-brown above, 

 inclining to pitch-brown in parts, and varied with much lighter groundinsr similar in tint 

 to the predominant light yellowish-brown of the venter; the dorsal joinings of a light 

 colour ; the sides of the dorsum are distinctly shagreened, or impresso-punctate, with 

 pitch-brown ; the venter is more densely inipresso-punctulate with intense warm sepia-- 

 brown, and has depressions corresponding in size and situation with the pairs of abbre- 

 viated longitudinal streaks at the bases of the segments. Forceps whitish ; the basal 

 joints of the limbs uniform with the venter in colour and stippling. Setfe dusky, with 

 black joinings. TVin^s vitreous; longitudinal neui'ation of the fore wing fuscous, varied 

 in places with white ; cross veinlets white, excepting sometimes a few of those contained 

 within the dark markings adjacent to the costal margin, which markings are varied with 

 various rounded pellucid spots in the customary manner ; the marginal area contains 

 about 10 nearly straight, oblique cross veinlets in the pterostigmatic region, pai-tly con- 

 joined by a longitudinal line of irregular granulations ; the terminal margin itself is 

 aniformly dark, and the interneural veinlets upon it are mostly in pairs. Length of body 

 )r wing 6o-7 ; sette 13-16 mm. 



nab. Colorado (^M'Lach. Mus.). In the absence of the subimago one can hardly 

 lecide whether this should be regarded as a distinct species or not. 



^ALLiB^Tis Picxrs, Etn. Plate XTI. 28 c (wings and two femora). 



Baetis pictus, !Etn., Trans. Ent. Soc. London (1871), 12.2, pL v. 27 [hind wing] ; Hag., op. cit. 

 1873), 402. 



Callibxtis [type] pictus, !Etn., Ent. Mo. Mag. xvii. 196 (1881). 



Subimago (dried). — "Wing-membrane sepia-grey, transparent ; neuration (including 

 ross veinlets) brownish, the cross veinlets sometimes narrowly and indistinctly edsred 

 ith dim obscurity. Legs pale dull yellowish brown, the femora spotted, the tarsal 

 linings and ungues brown. Sette sepia-grey, with dark joinings. 



26* 



