1878.] 129 



South Holland (Van Walclieren) ; Eotterdam (Pransen). France: 

 Amboise (Lelievre) ; Toulouse, at gas lamps (Eaton). July and 

 August. 



Amethopus, gen. nov. 



Imago. Tarsi posteriores qtcinque-articulati, tibice adnati suturd snh- 

 discretd, articulo proximo modice longo. Abdomiiiis segmentum pemil- 

 timum (?) hand infra in laminam productinn. Setce tres longce. Aim 

 quatuor. Oculi maris infegri ; forceps quadri-articulata, articulo proximo 

 paulo (fere dimidio ipsius longitudinis) seciindo breviore. 



[ $ . Tarsi antici femore tibidqite conjunctim duplo, vel hdc sold quintuplo, 

 longiores; articulo proximo pcene duplo longiore tibid,in subimagine tam,en eidem 

 subcequali : postici articulo proximo dimidio longiore secundo, hoc quinto, 

 pariterque tertio quarto suhcequalibus, tertio breviore secundo.* 



? . Pedum anticorum tarsi longittcdine femori tibiceque conjunctim sub- 

 cBquaies ; tibia vix longior dimidio femoris ; proximo articulo tarsorum tibid 

 parum breviori, cceteris decrescentibus et longitudine conjunctim tibice cum 

 primo subcequalibus. Fedum posticorum tarsi femore parum breviores, femore 

 tihid duplo longiore; articulo proximo et ultimo subcequalibus, singulis longi- 

 tudine dimidio tibice cequalibus, secundo vel tertio duplo longioribus (his 

 paribus), quarto omnium brevissimo. 



Affinities with the Siphlurus-Heptagenia series of genera, ap- 

 proaching Oniscigaster and Bcetisca in the structure of the hinder 

 legs, Sipldttriis in the absence of the usual ventral lamina of the ninth 

 abdominal segment of the female, and Ileptagenia in the distribution 

 of the veins adjacent to the inner margin (post-costa) of the anterior 

 wing. The peculiarities of this neuration cannot be defined verbally 

 in an intelligible manner. — A. E. Eaton.] 



Ametropus eraghlis, n. sp. 



Subim. ? . Thorax supra dilute hepatieus, siibtus testaceus. Alee pallide 

 fumatce, nervis longitudinalibus pallide favescentibus. Pedes testacei, tarsis, 

 tibiis,femorum anticorumque apicibus infuscatis. Abdomen fuscum,juncturis 

 late testaceis. Setce testacece. 



Imago i . Oculi fuUginosi. Tergum thoracis fusco-piceum. Alee vitrince ; 

 nervi longitudinales pallide electro-colorati vel testacei, transversalcs lim- 

 pidi atque in ared pterostigmaticd numerosi subsimplices lenteque curvati. 

 Pedes antici testacei, femoribus post medium tibiisque obscure piceis : pos- 

 terior es pallide flavescenti-lutei. Abdomen supra saturate fuscum, ad latera 

 juncturasque testaceum ; subtus Jlavescens, segmentis idtimis duobus infus- 

 catis. Forceps testacea. Seta albidce. 



* These proportions are stated somewhat in detail in the absence of figures. Even in figures 

 of the legs of Ephemerid(e it is always necessary to make allowances for pos.sible minor variations 

 in the exact proportional lengths of the parts in individuals and in different species. — A. E. E. 



