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INSECTA. 423
110. EPHEMERA (Coa) alis 2 ereflis ovatis; alte-
ris 2 planis lineari lanceolatis apice intortis.
Caput pendulum. Rostrum conico-acuminatum,
longiusculum.
Mandibulæ lateribus rostri subtus affixæ, illoque
longiores, teretes, capillares, glabræ, utrinque
una.
Oculi ad latera verticis, utrinque unus, parvi,
globosi, protuberantes.
Antennæ in fronte capitis inter oculos
approximatæ, capillares, erectæ, longitudine abdominis.
Thorax oblongus, convexus, breviusculus.
Abdomen dorso anterius gibbosum, cæterum
oblongum, cylindricum, segmentis tenuibus
compositum, apice forcipatum, forcipe aculeis binis
utrinque uno composita, qui longiufculi, teretes,
acuminati.
Alæ IV maxime inter se differentes, 2 nempe
margini superiori dorsi affixæ, ovatæ, latissimæ,
erectæ, margine superiore lineari, inferiore
convexo, apice angustatæ, basi rotundatæ. 2
alteræ lateribus abdominis pone dorsum asfixa,
juxta abdomen longitudinaliter extensæ, ab
söultra medium lineares, subtus concavæ, reliqua
sui parte ovato-lanceolatæ, versus apicem
latiusculæ, intortæ, antecedentibus duplo longiores
costa per medium illarum longitudinaliter
currit, quæ per margines partis alarum lateriores
radios utrinqgue emittit pinnatos. Costa juxta
marginem alarum superiorum longitudinaliter
percurrens, inter quem & marginem ala est
radiis simplicibus transversalibus.
Alæ supertores cæterum recticulatæ.
Pedes VI. utringne 3, duo thoraci abdomini
affixi, graciles, unguiculis tenuibus apice
instructt.
CC- Ca-
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