120 EEV. A. E. EATOX ON EECEXT EPHEMEEID.^ OE MAYFLIES. 



imioerceptible traces of cross veinlets before the bulla, and beyond that 6-7 well-defined, 

 simple, nearly straight cross veinlets. 



? differs from 6 in the usual manner. Fore leg piceous, the tarsus whitish, with the 

 apical edges of the intermediate joints narrowly darkened ; in some lights the tibia as 

 well as tbe tarsus appears brownish white. AVings tinted almost imperceptibly with 

 greyish ; their neuration more distinctly bistre-brown than in the d ; in the disk of the 

 fore wing, between the costa and the upper branch of the prsebrachial (6) nervures, the 

 cross veinlets are well defined ; the marginal area contains about 3 almost effaced cross 

 veinlets before the bulla, and beyond tliat 9, usually all simple and slightly curved. 

 Length of body 5-5'5 ; wing, cJ 5, $ 6-7 ; setse, 6 ira. 8 millim. 



Mab. Common at the end of July and beginning of August iu the Appennino Pistojese, 

 near San Marcello, at altitudes of 2100-2700 ft. During the afternoon, the flies throng 

 together along the borders of streams in the shade of alders (Alnus) : hence the name. 

 They are obtainable at other times by beating. The nymphs abounded under suitable 

 stones in the grounds of the Villa Margherita. A d im., captured at an altitude of 

 4-100 ft., near Abetone, has the brownish colour of the hinder legs well marked. 



Habrophlebia. mesoleuca, Brauer. 



Potamanthus mesoleucus, ! Brauer, Neuropt. Austr. 74 bis (1857). 



LiplophlMa mesoleuca, ! Etn., Traus. Ent. Soc. London (1873), 397; Eostockj Jahresb. d. Ver. f. 

 Naturk. Zwickau, 1877, p. 81 (1878). 



Imago {dried), 6 . — Thorax jet-black above. Abdomen in segments 2-7 pellucid 

 white, the remainder reddish brown above. Setoe white [with darker joinings] ; forceps 

 white ; penis spurred beneath, the spurs rather longer than the lobes, reclinate and 

 slender. Fore legs greyish white ; hinder legs white, pellucid [their femora tinged with 

 fuscous]. Wings vitreous; subcosta and radius of the fore wing subpiceous; cross 

 veinlets of the pterostigmatic region curved and mostly simple. Length of body 5, 

 wing 6 ; setfe, 6 im. 7 millim. 



Ilah. Austria, marshy places in the Prater, near Vienna, iu June, and in Styria 

 (Brauer); Saxony, very common near Dretschen (Uostock). The foregoing is based upon 

 Dr. Brauer's description, supplemented by original notes made in 1873 of a specimen 

 named by E-ostock, and forwarded for ins2)ection by Mr. Albarda. The darker fore femora 

 of H. lauta enable it to be separated at a glance from the present species. 



Habrophlebia LArxA (renamed). 



Potamanthus J ductus, Pict., Hist. Nat. Nevropt. ii. Epliem. 219, pi. xxviii. 1-G (1813-5); Walk., 

 List of Neuropt. Ins. in Brit. Mus. part iii. 513 (1853). 



Habrophlebia lauta, ! M'Lach., Eev. d'Ent. iii. 19 (1884) [undcscribed] . 



Subimago {dried). — Wings whitish sepia-grey, with concolorous neuration. 



Imago {living), d . — Upper eyes flesh-red [this colour modified iu some examples with 

 testaceous], lower eyes black. Thorax jet-black above, varied with a lighter colour at 

 the sides. Abdomen, from segment 2 to the base of segment 7, pellucid white, with the 

 tips of the segments sometimes tinged very faintly with light reddish; the remaining 

 segments subpiceous above, modified beneath more or less, from segment 8 to the tip, 



