EPHEMERIN.E. 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. 



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

 24, f. 5. 



Brazil. 



Genus 3. PALINGENIA. 



Oculi remoti, maris simplices. Pedes bene determinati. Seta? 

 caudales tres, media maris saltern brevissima. Alae reticulatae, 

 quatuor, venis plurimis trans versis. Larva subiens, instrumentis 

 respiratoriis foliaceis, ciliatis. 



Palingenia, Burm. 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 tentaculae slightly curved ; inter- 

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

 rudimentary. 



1. PALINGENIA VIRGO. 



Corpus fiavum, immaculatum ; prothorax longior quam latior ; seta 

 caudalis media brevissima sed distincta ; alee hyalines. 



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



f. 13. 

 Ephemera virgo, Oliv. Enc. Meth. vi. 419, 11. Reaum. Ins. vi. 



457, pi. 4244. Schceff. Abhandl. Ins. iii. 30 ; Icon. Ins. 



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



