99 MODERN CLASSIFICATION OF INSECTS. 
Dec. 1832; fig. 60. 2. P. cephalotes ¢*); the latter circumstance 
also occurs in Nemoura trifasciata Pictet. These insects frequent 
damp marshy situations, and the borders of lakes and rivers, resting 
upon stones, palings, and plants, growing close to the water's edge ; 
they are sluggish in their movements, and the larger species are 
well known to the angler as an excellent bait for trout; Perla bicau- 
data appearing in April, being called the Stone-fly ; Chloroperla viridis 
in May, termed the Yellow Sally; and a species of Nemoura in Sep- 
tember, called the Willow-fly. (Ronald's Flyfisher’s Entomology.) 
Curtis gives the name of Willow-fly to Chloroperla viridis. 
In their preparatory states, these insects reside in the water: the 
female, according to Scopoli (t.Carn. p. 705.), Suckow, and Curtis, 
carries a globular bundle of little black shining eggs at the apex of the 
abdomen, enclosed in a valve or bag; such is also the case with the 
Ephemera. In the works of Geoffroy, Olivier, Fabricius, Latreille, 
&c., the transformations of these insects are described as being similar 
to those of the Phryganez ; namely, having a cased larva, and an in- 
active pupa; and Mr. MacLeay, misled by this statement, has united 
the Perlide in the same order with the Phryganez, with which, 
indeed, they agree in the large size of the posterior folded wings, and 
the weak structure of the mouth. The error originated with Reaumur, 
who reared a small bicaudated Perla in a vessel, in which “ M. l’ Abbé 
Nollet avait mis ou cru n’avoir mis que nos teignes a fourreaux dont 
Venvelope est une espece de ruban vert roulé,” or a cased larva of 
one of the'Phryganex. (Mémoires, tom. ui. p. 178. pl. 13. f. 12. and 
pl. 14. f. 8. 9. and 10.) ‘It is evident, from a reference to Latreille’s 
Hist. Nat. vol. xiii. p. 47., that his statements relative to the trans- 
formations of this group are derived from the memoir of Reaumur above 
referred to, and the history given by Geoffroy (Hist. Abrégée des Ins. 
tom. ii. p. 230.); but Geoffroy himself informs us in p. 233., that the 
history which he gives of the genus is that of “la perle jaune,” an 
insect only two lines long, and which evidently does not belong to the 
family. 
These statements, however, at least so far as the present family is 
concerned, are incorrect; the larve of the Perlide being naked, not 
* Tn a beautiful species from Van Dieman’s Land, which I have received from 
Mr. R. H. Lewis, the females are occasionally furnished with only short wings. 
One thus constructed, in the collection of the Rev. F.W. Hope, has a bundle of eggs 
still attached to the extremity of the abdomen. (Eusthenia diversipes WW.) 
