42 REV. A. E. EATON ON EECENT EPHEMERID^ OE MAYFLIES. 



of the fore wing violet-fuscous, the nervures in other parts of the wing light fuscescent ; 

 neuration whitish in the hind wings. Length of body 11, exp. of wings 38 mm. 

 Hah. Brazil (Burm. ; Pict. in Vienna Mus.). 



JOLIA, Etu. 1881. 



nUtstrations. Alleged Adult, PI. II. 9 (details). Nijmph, PI. XXVII. (whole figure 

 and details) : see also citations of figures by Joly and Vayssifere under J. Boeseli. 



AdulL—Discal cellules of the fore Aving moderately small, subquadrate ; neuration, as 

 a whole, very similar to that of Polymitarci/s. 6 , fore leg about as long as the head and 

 body together, the tarsus shorter than the femur, which is more than ^ as long as the 

 tibia; tarsal ungues iinequal, dissimilar, narrow, long and flaccid (probably subim.). 

 Spiracles mutilated in the types. Setoe 2 ; in ? about ^ or J as long as the body, 

 glabrous, excepting near the tips, and there minutely puberulous ; in d (subim. ?), nearly 

 as in Camps7iriis subim. Eyes of s (subim. ?) large, mutually approximated above, 

 rounded, excepting at the inner orbit, and there somewhat flattened or straight ; anterior 

 ocellus rather smaller than the others. Forceps-limbs sessile upon the distal border of 

 the 9th ventral segment ; the proximal joint (subim. ?) short and largely dilated (perhaps 

 = a divided ventral lobe), the 2nd joint the longest ; integument transversely rugose 

 and puberulose. Penis exposed, without apparent stimuli. Lateral margins of the 

 abdominal segments somewhat flattened out in a small degree ; the hinder lateral angles 

 of the 9th segment of the d produced into a short tooth-like spine, those of the other 

 segments acute or subrectangular, not produced. Duration of subimago stage {fide 

 Joly) about 30 minutes ; last moult complete. Nymph predatory, agile ; mandibles 

 tuskless ; fore tibia spurred, and strongly setose behind ; 7 pairs of abdominal tracheal 

 branchiae inserted in notches in the hind margins of the segments near their lateral 

 angles on the dorsum, all made alike but unequal in size, each one formed of a single 

 obovate membranous lamina, intersected obliquely by a fine crease or strengthening 

 rib, containing a pinnatcly branched trachea, and furnished at its hinder base with a 

 fascicle of filaments ; margin of the lamina minutely serrated. Seta3 about -^^ as long as 

 the body, the median plumose and the outer ciliated on their inner sides for upwards of 

 half their length, and then tail-pointed. Palpi of both maxilla) 2-jointed. — Head 

 relatively small, narrower than the thorax. Antennas long and slender, setaceous and 

 multiarticulate, the first two joints the stoutest. Labrum ciliate in front, hispid on the 

 outer surface. Mandibles broad, their two fangs slender and acute, the innermost 

 appendaged, and distant from the molar protuberance. Laciuia of 1st maxilla rounded 

 and pilose externally, subtruncate and ciliate within, acutely pungent ; stipes furnished 

 with a small fascicle of tracheo-branchial filaments at the base outside ; palpus stout, the 

 second joint enlarged and densely pilose, the first joint glabrous. Lacinia of second maxilla 

 semiovate, densely pilose, excepting towards the pubescent apex; palpus stout, the 

 second joint enlarged, densely pilose, and about thrice as long as the first joint. Lobes of 

 the labium well defined, Imt seemingly coherent, smaller than the lacinia? of the maxillce. 

 Median lobe of the tongue subrotund; paraglossaj rounded, pilose. Body proportioned 



