242 EEV. A. E. EATON OIN EECENT EPHEMERID.E OR MAYFLIES. 



neuration in some lights pitcli-black, in others pitch-brown, the cross veinlets in some 

 positions remaining of the darker colour while the longitudinal nervures become pitch- 

 brown ; in both pairs of wings the subcosta is dark throughout, but the other main 

 nervures become more or less deficient in colouring near the wing-roots. Setae sepia- or 

 warm sepia-brown at the roots, lighter distally, with dark joinings. The living d is 

 described in the publication cited above. 



? {living). — ^Eyes greenish, intersected by a fusco-piceous line, and exhibiting a 

 moveable black spot. Very similar in colour and markings to 6 . Dorsum of abdomen 

 in segments 2-7 either fusco-luteovis or light bistre-brown, with a rounded pale space on 

 each side extending some distance from the base of each ; segments 8-10 brown-ochreous : 

 in each of the intermediate segments the recurved stripes from the dark terminal 

 bordering are piceous, and there is a dark median longitudinal streak from which the 

 colouring spreads outwards for a short distance along the basal margin of the segment ; 

 the median streak disappears in the process of drying. Length of body, d 11, ? 13 ; 

 wing, 6 12, $ 15 ; setaj, d im. 28-29, subim. 17, S im. 22-26, subim. 19 mm. 



Hab. Southern France, and perhaps Northern Italy : August and September. 

 Common at Tarascon (Ariege), inhabiting the conduit above the town as well as the 

 main stream (1560 ft., August 25th, afternoon and evening, water 64° P., and Sept. 1st). 

 A ? subimago doubtfully referred here was captured between Lovere and Breno in the 

 Val Camonica (770 ft., August 3rd, 3.30 p.m., water 66° F.). This specimen (cMed) has 

 very light sepia-grey wings, with pitch-black neuration and pale yellowish wing-roots. 

 The Oglio and Ariege in the places specified have apparently a similar water-climate, 

 and are inhabited by Oligoneuria rhcnana ; therefore it is not improbable that the same 

 species of Epeorus is common to both. My hesitation as to the identification of the 

 Italian insect proceeds from the slight colour-differences noticeable between the single 

 examples of subimago available for comparison ; but these may be due solely to disparity 

 of age. 



Care must be taken to distinguish this species from Ecdyurus fiuminum 2 . 



Epeoktjs psi, sp. nov. 



Imago [in spirits). — 6 . Body discoloured. The abdomen exhibits black markings 

 upon a lighter ground-colour, viz. : — on the dorsum, in segment 2 a small round median 

 spot ; in segments 3 and 4 corresponding single trilobate spots ; in segments 5-9 corre- 

 sponding single tridents or ^-oid markings, each formed of a median longitudinal line in 

 combination with oblique stripes ascending the sides of the dorsum. The ventral 

 markings in each of segments 2-7 comprise a very fine longitudinal median line produced 

 forwards from the hinder part of the segment, sometimes partially effaced anteriorly, 

 and a pair of fine tapering streaks, one on each side of the median line, mutually 

 convergent towards the base of the segment. Each femur has a neatly defined black spot 

 nearly in the middle, and is darkened towards the knee ; ungues each unlike the other. 



? . Ventral lobe of segment 9 very slightly emarginate in the middle. Length of 

 body, 6 16, S 18 ; wing, 6 16, ? 22-24 ; setae, d and ? im. 40 mm. 



Hah. Kooloo, Himalaya (Rev. M. Carleton, Mus. Comp. Zool. Cambridge, Mass.). 



