36 ON THE SYNONYMY OF THE PERLITES. 



Inhabits -. Two specimens in the cabinet of the 



British Museum. 



Sp. 4. Perla bicaudata. (Corp. long. .7 unc. alarum dilat. 2 vmc.fem.) 

 „ Jlavipes, Fourcroy ; ' Entomologia Parisiensis,' p. 349. 

 „ a pattes jaunes, Geoffroy ; ' Histoire abrege des Insectes, 

 vol, ii. p. 231. 



„ Jlavipes, Latreille; 'Hist. Nat. Crust. &c.' vol. xiii. p. 49. 

 „ bipunctata, Pictet; 'Annales des Sciences Naturelles,' vol. 

 xxviii. p. 55, tab. y.fig. 12 — 14. 

 „ marginata, Stephens; 'Illustrations of British Entomology' 

 Mand. vol. vi. p. 135. 

 Phryganea bicaudata, Linneus ; ' Fauna Suec.,' p. 379, No. 1489. 

 „ „ „ 'Syst. Naturae,' vol. i. 908, No. 1 



„ maxima, Scopoli ; ' Entomologia Carniolica,' p. 269. 



Head fulvous, with two brown spots including the ocelli, and often pro- 

 longed to the base of the antenna, which are nearly black, with the basal 

 joint generally yellow : in front of these spots is a third, somewhat triangu- 

 lar, and situated nearer to the clypeus. The prothorax is fulvous, with the 

 margins and a median longitudinal line dark brown or nearly black, and on 

 each side of this median line is a black spot in the living insect, but this 

 frequently nearly disappears after death, and in some specimens becomes 

 quite obliterated, and the entire disk of the prothorax appears brown. The 

 meso- and metathorax are bordered with yellow : the legs are yellow, with 

 the joints fuscous: the wings are less transparent than in the following 

 species, and the abdomen is of a more dusky hue. 



Inhabits Europe and England. In the cabinet of the En- 

 tomological Club. That Fabricius and all subsequent authors 

 have entirely mistaken the Phryganea bicaudata of Linneus 

 will be perfectly evident to any entomologist who will take 

 the trouble to examine the Linnean specimen now in posses- 

 sion of the Linnean Society. As to the real distinctness of 

 the following species from the present, I am unable to decide. 

 I had considerable doubts on the matter, against which M. 

 Pictet's detailed characters of the species in their larva and 

 imago states, have so far prevailed as to induce me to keep 

 them separate for the present. 



Sp. 5. Perla marginata. (Corp. long. .7 unc. alar, dilat. 2 unc.) 

 „ „ Panzer ; ' Fauna.' \xxi.Jig. 3. 



„ „ Pictet ; ' Annales des Sciences Naturelles,' vol. 



xxviii. p. 53, tab. 5,ff. 1 — 11. 

 Semblis marginata, Fabricius ; ' Entomologia Systematica,' vol. 

 ii. p* 73, No. 7. 



Phryganea bicaudata,} ^ Rcemer ' ' Genera '' tab ' xxiv ' J* 8 ' 

 „ maxima, Scopoli ; ' Entom. Carniol.' p. 269. 



The head is yellow, margined with brown. The ocelli are black, with a 

 triangular space between them brown ; the antenna are entirely black, -the 

 prothorax is brown, with a median longitudinal furrow and various irregu- 



