CLAS. III. SYNIST. Ephemera . 315 



anteriores maxillac dorso : 

 fostertores labii apici adhaerentes . 

 Jl^fatidibi^la omnino nulla ► 

 MaxilU brevis , membranacea , integra , cum la- 



bio arcte connata. 

 Labititn breve , membranaceum . 

 jintennA brevissimae , subulatac . 

 X-arva aquatica hexapoda , agiHs , caudata , nata- 



toriis laterahbus senis . 

 Tffpa hexapoda , agilis , caudata 7 natatoriis ex- 



trorsum crassioribus , alarumque rudimentis* 

 Victtis larvs et pups e foHis plantarum aquati- 



carum : imaginis nullus , quum ejus vita vix 



ultra diem unicum protrahatur . 

 Als erectas , postica: minim^ . Cauda setosa, 

 * Caiida triseta . 



1. Ephemera cauda triseta , alis Fusco-reticalatis VHlgatA, 

 maculatisque , corpore fusco . Fabr. Sp,Ins. i. 



p. 583. Linn. Systt Nat. 2. p. 90^* i. 

 JEvhemera cauda tristrta , abdomine obscure flave- 



scente , maculis nigris trigonis , ahs fusco-ma- 



culatis . Degeer. Ins. 1, p. 6ii. i.tab.ifi. fig.i. 

 In Europae aquis . Vespere sub arboribus choreas 



instituunt . 



2. Ephemera cauda triseta , alis hyalinis reticula- Imeal 

 tis , corpore luteo . Fabr. Sp. Ins. i. p. 385. 

 Linn, Syst. Nat. 2. p. 906. z. ' 



Lphemera lutea , alis albis reticulatis , cauda tri- 



seta . Geoffr. Ins^ 2. p. 238. 2* 

 In Europs aquosis, 

 3. Ephemera cauda triseta, alis nigris : posticis vesper» 



aibis . Tabr. Sp. Ins. i. p, 384, Linn. Syst. tina* 



Nat. 2, p. ^q6. 4» 



