Insects. 5851 



Ephemera Stigma= Potamanthus marginatus of Zetterstedt, female ; 

 and E. talcosa is referrible to the same species. 



Ephemera lutea is the female of a new species of Baetis, and E. 

 marginata is the male of the same. 



Ephemera submarginata, Id. p. 58, is the female, and E. dispar 

 the subimago of the male of a new species of Potamanthus ; it must 

 stand as Potamanthus dispar. 



Ephemera fusca is the male of a new species of Potamanthus. 



Ephemera diluta. Of this species there is no example. 



Ephemera apicalis, Id. p. 59, is a new species of Cloe. 



Ephemera rufescens = Potamanthus fuscus, male and female; and 

 E. rosea is the same species. 



Ephemera helvipes = Potamanthus apicalis, female. 



Ephemera dubia is the male of a new species of Cloe. 



Ephemera minor is the female of a new species of Potamanthus. 



Caenis macrura is a new species, male. 



Caenis dimidiata, Id. p. 61, is the male of C. grisea of Pictet ; C. 

 brevicauda is the subimago of the female of the same species, and C. 

 pennata is the imago. 



Caenis Harrisella and C. interrupta, Id. p. 62, are both wanting. 



Caenis chironomiformis = Ephemera halterata of Fabricius, female. 



Baetis dispar, Id. p. 63, is the male, and B. venosa the female, of 

 a new .species. 



Baetis longicauda, B. costalis, Id. p. 64, and B. subfusca, consti- 

 tute a new species : costalis and subfusca are females. 



Baetis elegans is a new species, the male a subimago, the female 

 an imago. 



Baetis semicolorata is a new species, male. 



Baetis lateralis, Id. p. 65, is a new species, male and female. 



Baetis obscura is the female of Ephemera rosea. 



Baetis carnea. There is no specimen. 



Baetis striata is the female of a new species of Cloe. 



Baetis bioculata, Id. p. 65, is the male, and B. fuscata, Id. p. 66, 

 the female of a new species of Cloe. 



Baetis culiciformis = Ephemera diptera of Linneus, male, and 

 Cloe dipterum, p. 68, are females, the imago and subimago, of the 

 same species. 



Baetis horaria is the male, and B. verna the female of a new spe- 

 cies of Cloe. The name horaria must be adopted. B. singulata, 

 p. 67, is another male of the same species, and Cloe ochraceum, p. 

 68, is a female. 



