EEV. A. E. EATON ON EECENT EPHE1MEEID.E OE MAYFLIES. 163 



line of each of them darker ; segments 7-10 fuseo-lutescent ; venter greenish grey, tinged 

 with brown ochre in segments 8-10 ; the first two joints of the forceps lurid, varied with 

 fuscescent, the other two fumatose. Setae smoky white, with rusty-reddish joinings. 

 Fore femur greenish grey, the tibia and tarsus scpia-grey or dusky ; hinder femora paler, 

 the tibige and tarsi whitish grey or smoky, with black joinings. Wings vitreous ; sub- 

 costa and radius of the fore wang, and other longitudinal nervures towards the base of 

 the wing, light amber-yellow, becoming blackish in the outer part of the disk ; cross 

 veinlets likewise blackish. Length of body, d im. 10, wing 10, setaj 19 mm. 



Sab. Portugal. The streamlet near Bemfico, which passes under Alcantara, Lisbon ; 

 23 May, 1880. The temperature of the water at the time was 66° F. Named out of com- 

 pliment to the learned investigator of the Portuguese fauna, Senhor Barboza du Bocage. 



Baetis gemellus, sp. nov. Plate LXIV. 14 (forceps). 



Ba'etis Xrhodani, var., ! Etn., Trans. Ent. Soc. London (1871) p. 114. 



Snhimago {lmn(j).—WmQ?, dark smoky grey in 6 , darker in ? ; setfie of a like colour, 

 with rufescent joinings in <s . Fore femur of d dull yellowish tinged with grey, with a 

 dark spot inside before the knee ; tibia blackish grey or dusky ; tarsus charcoal-black ; 

 hinder femora pale greenish smoky grey ; the remainder of the hinder legs smoky grey, 

 with the tarsal joinings black. Femora of ? light yellowish grey ; tibiae and tarsi 

 smoky grey, with the tarsal joinings black. 



Imago [Uriug). — d . Turbinate eyes bright light red ; lower eyes olivaceous or olivaceo- 

 fuscous. Notum either light brownish ochre streaked with fuscous or pitch -brown, or 

 else fuscous with the sutures raw-sienna yellow. Abdomen in segments 2-6 pellucid 

 white, with the joinings and rounded lateral nebulae above the pleurae suffused with 

 either yellowish fuscescent or raw sienna ; the remainder of the dorsum either raw sienna 

 throughout, or onlj' so in segments 9 and 10, w^ben segments 7 and 8 are light brown- 

 ochreous fuscous ; segment 10 bright yellow beneath. Setae smoky or dusky, with 

 medium burnt-sienna red or black joinings. Fore femur and base of the tibia in some 

 lights tinted with light amber-yellow, changing in other lights to a stronger yellow ; the 

 remainder of the tibia and the tarsus dusky or dull greenish grey, with darker joinings. 

 Hinder femora either dull whitish amber, or whitish tinged with olive-green ; tibiae and 

 proximal joints of the tarsi either whitish or light yello^"ish smoky white ; the remainder 

 of the tarsus dusky, with darker or black joinings ; ungues black. Forceps smoky white 

 or greyish fuscous ; the basal joints raw sienna. Wings vitreous ; the stronger longi- 

 tudinal nervures slightly amber-tinted, and towards the base of the wing of a greenish 

 grey tint ; the costal projection of the hind wing slightly fuscescent. 



$ . Eyes pitch-black ; the space between the ocelli, the basal joints of tlie antennae, 

 and a spot on each side intermediate between the eye and the insertion of the antenna, 

 raw-sienna yellow ; epistomum ochraceous, with fuscous carina. Abdomen fuscescent 

 above, with the terminal margins of the intermediate segments rufo-piceous, edged very 

 narrowly in segments 2-5 with yellow-ochre, and with the sides of the dorsum lighter 

 near the pleurae ; venter lighter than the dorsum, wdth the joinings darkened ; the last 

 two segments tinged with raw-sienna yellow. Legs somewhat as in the 6 , but darker ; 



22* 



