T 4 Symnis tata, 
scutello rotundat. abdomine elongat, subcarinat, de- 
press. cauda bi aut triseta, alis quatuor erectis, hya. 
linis: postic breviorib, pedib, tenuib. tarsis 5 arüicul, 
€elore obscuro, | 
Character specierum. 
407. E vulgata, cauda triseta, alis fusco reti- 
' éulatis maculatisque, corpore fusco, Fabr. Entom, 
system. 3, 60. sr, Syst, Entom, 305. 1, Spec. Insect. 
1. 905. 1. Mant. Insect, 1, 945. 1, 
Ephemera vulgata, cauda triseta, alis nebuloso ma- 
culatis. Linn. Syst. natur, 9. 906. 1. Faun. Suec, 
1472. 
In aquis. 
4e8. E. mavginata, cauda triseta, alis albis: 
margiue exteriori [usco, corpore nigro. Fabr. En- 
tom. system. 8, 6). 5. Syst. Entom. 505. 5, Spec. 
Insect. 1. 584. 9. Mant, Insect. 1. 245, 5. 
 Ephemera marginata, Linn. Syst, natur. 9, 906. 3. 
In aquis, 
409. F, vespevtina, cáuda triseta, alis nigris: 
posticis albis. Fabr. Entom. system. 5, 69. 5. Syst. 
Entom. 303.4, Spec. Insect. 1 584.4. Mant. lusect, 
1, 949. 4. AN j 
Ejhemera vespertina, Linn, Syst, natur. 2, 906, 4. - 
Faun Suec. 1490. 
juxta aquas, 
410. E. bíoculata, cauda biseta flava, alis al- 
bis reticulatis, capite tuberculis duobus luteis, Fabr. 
'Enioim, 
