EPHEMEKIN^. 547 



limpid ; veins black ; transverse veins numerous and distinct ; veins 

 clouded with black along the fore border, which is brown along one- 

 third from the tip. Length of the body 4^ lines ; of the wings 12 

 lines. 

 a — c. New Holland. Presented by the Entomological Club. 



24. PoTAMANTHUS? INANIS. 



Alee duce. 



Potamanihus ? inanis, Pictet, Hist. Nat. Neur. Eph. 232, 11, pi. 

 24, f. 5. 



Brazil. 



Genus 3. PALINGENIA. 



Oculi remoti, maris simplices. Pedes bene determinate. Setae 

 caudales tres, media maris saltern brevissima. Ala? reticulata?, 

 quatuor, venis plurimis transversis. Larva subiens, instrumentis 

 respiratoriis foliaceis, ciliatis. 



Palingenia, Burnt. Handb. Ent. ii. 2. Pictet. 

 Ephemeridae, p., Newman. 



Eyes simple in both sexes, almost always parted by an interval : 

 wings four, like those of Ephemera, but with a more close reticula- 

 tion : prothorax large : abdominal tentaeulae slightly curved ; inter- 

 nal appendages large and conical : median tail-bristle of the male 

 rudimentary. 



1. Palingenia virgo. 



Corpus flavum, immaculatum ; prothorax longior quam latior ; seta 

 caudalis media brevissima sed distincta ; alee hyalince. 



Palingenia virgo, Pictet, Hist. Nat. Neur. 141, 1, pi. 9, 10, 11, 



f. 1—3. 

 Ephemera \irgo, Oliv. Enc. Meth. vi. 419, 11. Reaum. Ins. vi. 



457, pi. 42 — 44. Sthaff. Abhnndl. Ins. iii. 30 ; Icon. Ins. 



Ratisb. pi. 175, f. 1—3. Latr. Hist. Nat. Ins. xiii. 98, 13. 



