572 EPHEMEEIN.E. 



Genus 5. CLOEON. 



Oculi maris duplices. Pedesbene determinati. Setae caudales 

 duae. Alae quatuor, venis transversis paucis. Larva natans, non 

 subiens, cauda valde ciliata. 



Ephemera, Linn. , De VilL ; Fair. ; Gmel. ; Oliv. ; Schr. ; Walkn. ; 



Lair. ; Stew. ; Turt. ; Guer. ; Zett. ; Blanch. 

 Cloeon, Leach ; Steph. ; Curt. 

 Cloe, Burm. Handb. Ent. ii. 2 ; Pictet ; Ramb. 

 Bae'tis, p., Steph. 

 Oxycypha, p., Burm. 



Each of the ordinary eyes of the male surmounted by a great 

 reticulated eye in the form of a turban, that is supported on an ob- 

 conical ring at whose base is the ordinary eye : wings two or four ; 

 fore-wings having only very few cross-veins which generally form two 

 crooked lines : lower wings, when they exist, rudimentary, and with 

 a more or less incomplete neuration : abdominal tentacula rather 

 large ; internal appendages short, conical : two tail-bristles with a 

 verv little rudiment of the median one. 



A. Alae quatuor. 

 1. CLOEON BIOCULATA. 



Maris oculi obscuri ; mesothorax flavus unicolor ; abdomen basi 

 apiceque obscurum, apud medium pallidius ; alee non fasciatce 

 nee maculatce. 



Ephemera bioculata, Linn. Hist. Nat. Ed. 12, ii. 906, 5. De VilL 

 Linn. Ent. iii. 18, 7. Oliv. Enc. Meth. vi. 419, 10. Fabr. 

 Ent. Syst. ii. 70, 9. Gmel. Ed. Syst. Nat.i.2629, 5. Barbut, 

 Gen. pi. 11, fig. inf. sinist. ? Stew. El. Nat. Hist. ii. 211. 

 Turt. Syst. Nat. iii. 394. Walkn. Faun. Par. ii. 9, 6. Panz. 

 Faun. xciv. fig. 17. Latr. Hist. Nat. Ins. xiii. 97? Guer. 

 Icon. Regne Anim. Ins. PI. 60. Zett. Ins. Lapp. 1044, 9. 

 Blanch. Hist. Nat. Ins. iii. 54, 6. 



