of the Orthopterous Genus Cloeon. 



147 



great extent among individuals of the same kind, whether sub- 

 imagos or imagos, and it is not much affected by drying. The 

 interneural veinlets on the apical margin of the fore wings are 

 disposed in pairs in the species with round-tipped hind wings, 

 but singly in that with sharp-tipped wings. 



C. Rhodani, Pictet. 



In the (^ the turban varies precisely as does that of C. diptera. 

 The lines on the thorax also are si- 

 milar to those in that insect in 

 highly coloured specimens. The 

 anal setae are sometimes entirely 

 white, generally white, with fuscous 



rings at the joinings and the middle Hind wing, magnified. 



of the joints, seldom fuscous throughout, and become transpa- 

 rent, through tenuity, towards their tips. The imago appears, 

 in favourable weather, throughout the year. A branchial plate 

 of the pupa is figured, I believe, in M. Pictet's work on the 

 Ephemeridse. 



C. pumilum, Burmeister. 



Suhimago. ^ . Turban yellow. Spots and lines of imago 

 all indicated. Legs yellowish white; tarsi, tibiae, and tips of 

 femora tinged with fuscous. Thorax yellowish fawn-colour. 

 Abdomen pale yellowish grey. Wings and 

 setse unicolorous, fuscous. Penis black. 



Imago. Turban of male yellow, changing 

 to red when dry. Thorax shiny yellowish 

 brown. Legs yellowish, pale; knees and 

 tarsi darker in the female, but paler in the male. Abdomen in 

 the male whitish yellow, the four apical segments brown : in the 

 female dull yellow brown, with the tips of the dorsal arches darker. 

 Setae in both sexes white, either annulated with fuscous or not. 

 The hind margins are more delicate, much smaller and nariower 

 than those of C. Rhodani, as will be seen on referring to the 

 figures. 



C. bioculatum, L. 



Turban of male cornelian-red, seldom yellow. The imago 

 varies but little in colour. It appears from April to November, 

 if not throughout the year. The figure of 

 the hind wing of C. bioculatum, Pict. (Hist. 

 Nat. des Nevrop.), differs entirely from the 

 above. His is more like that of Stephens's 

 bioculatum (i. e. C. pumilum, Burmeister), to *^'"*' *'"«• «»8"i«'=d. 

 which insect C. bioculatum, L., when dry, is very similar, size 

 excepted. 



11* 



Hind wing, magnified. 



