EEV. A. E. EATON OX EECEXT EPHEMEEID.E OR MAYFLIES. 121 



with rusty yellow or dull orange. Seta3 and forceps white ; penis pitch-brown, changing 

 to testaceous when dried. Pore leg, with the trochantei', femur, and both extremities 

 of the tibia piceous, and the remainder white ; hinder legs white, with tlie tarsus, the 

 extreme base of the tibia, and the extremity of the femur very light dull amber-colour 

 or greyish. Wings vitreous, with pellucid neuration; marginal area of the fore wing 

 with 4-6 hardly perceptible traces of cross veinlets before the nodus and 3-4 beyond it, 

 followed in the pterostigmatic region by 7-10 that are well defined, simple, and almost 

 straight. 



$ [living). — Thorax fusco-piceous above. Dorsum of abdomen piceo-fuscous ; venter 

 lighter; sette white. The stronger of the longitudinal nervures of the fore wing are 

 faintly tinged with olive-grey. Length of body 5-6 ; wing 6'5-7 ; sette, im. <j 9 & 8-11 

 & 10, ? 6-5-7 millim. 



Hab. France, at and near Pau (under 600 ft.), June; common in the Vosges, and at 

 Bouillon, Belgium fM'Lach.), July. Switzerland, Miinciienbuchsee, Canton Berne, and 

 the stream at ^'ersoix, near Lake Leman, August ; near Troinex ixnder Mt. Sal5ve near 

 Geneva (over 1300 ft.), September. Some remarks concerning this species are given 

 above under Leptophlebia cincta. 



CALLIARCYS, Etn. 1881. 

 Illustrations. Adult (details). Pis. XIV. 23 (typical). [KB. PL XIII. 23*, 2, 3 

 (provisional), are referred to Thraulits.'] 



Advlt. — Hind wing very similar to that of species of Habrophlebia, with plenty of 

 cross veinlets and a comparatively narrow form. Cross veinlets numerous in the fore 

 wing, excepting near the inner margin ; those in the marginal area before the bulla 

 distinct ; some at the terminal margin (which has no isolated veinlets) occasionally con- 

 stitute here and there simple curved branchlets to longitudinal nervures in individual 

 wings. In the typical specimens, the intercalary nervures of the anal-axillar interspace 

 of the fore wing establish communication with the anal (8) nervure; they are four in 

 number (not counting as one an occasional simple branchlet of the anal nervure), and 

 3 and 4 are long, 1 and 2 short ; intercalars 1, 2, or 3 may terminate abruptly ; 1 may be 

 shorter tlian 2, may curve towards 2 instead of towards the anal, and may be linked hy 

 a series of cross veinlets to 3, 2, and the anal ; when 3 is abrupt, it is similarly linked to 

 the anal. Aperture of the mesothoracic spiracle without a guard. Forceps-limbs of S 

 3-jointed; the proximal joint much longer than tlie remainder, and gradually dilated 

 towards the base. Eorceps-basis excised in the middle ; the homologous ventral lobe of 

 $ bifid and acutely excised. Median caudal seta subequal to the others ; those of d 

 nearly 1^ as long as the body. Ungues in every tarsus each unlike tlie other; fore 

 tarsus of 6 about 1^ as long as the tibia, which is about \\ as long as the femur; its 

 joints, in diminishing sequence, rank 2 and 3 subequal, 4, 5, 1 ; hind tarsus little more 

 than ^ as long as the tiliia combined with joint 1, which is ill defined ; its joints rank 5, 

 2, 3, 4. Pore tarsus of ? little more than i as long as the tibia, which is little longer 

 than the femur; its joints rank 2, 5, 3 subequal to 4, and 1 fairly defined [the proximal 

 joining is too strongly defined in the wliole-figure of this leg]. Kymph unknown. 

 Type. C. humilis, Etn. 



