Mr. W. F. Evans's Monograph of Chrysopa. 11 



XXI. Monograph of the British Species of the Genus 

 Chrysopa. Brj W. F. Evans, Esq. 



[Read 6th September, 1847.] 



The following table has been drawn up after a careful examination 

 of those possessed by J. F. Stephens, Esq., the greater portion of 

 which he kindly lent me to draw the accompanying figures from, 

 which I have thought would aid in the discrimination of the 

 several species. 



But little attention has been paid to the early states of these 

 insects. The larvae of C. perla and C. reticulata, it would appear, 

 cover themselves with the skins of their prey, the Aphides, on 

 which they all feed most voraciously. (See Stephens' Mand. 

 vol. vi. ; Westwood's Mod. Class. Ins. vol. ii. , and Kirby and 

 Spence's Introd. ; and Reaumur, vol. iii.) Five different cocoons 

 and larvae can readily be distinguished on reference to the plates. 



EXPLANATION OF THE PLATES. 



PL IX. fig. 3. Chrysopa subj'alcata. 



6. ,, cornea. 



7. ,, abbreviata. 



PL IX. fig. 1. Chrysopa alba. 



2. ,, affinis. 



3. ,, angiistipeniiis. 



4. ,, perla. 

 Larva of C. perla, from Albin, pL 64 (undei fig. 2). 



ditto from a living specimen. 



Cocoon of C. alba ? from Reaumur, voL iii. pi. 33, fig. 2 (under fig. 2). 

 Cocoon of Drepanepteryx Fhalanoides, see Reaumur, vol. iii. pi. 32, fig. 

 and his description. 



PL X. fig. 4. Chrysopa maculata. 



5. ,, immaculata. 



6. ,, ventralis. 



PL X. fig. \, Chrysopa J'ulviveps. 



2. ,, capitata. 



3. ,, reticulata. 

 Portion of maxillary palpi, from Wesmael, Hem6robides de Belgique. 

 Tarsi — claws — antennae — a portion of a wing. 



Eggs, from Reaumur. 



Larva of C. alba, from a living specimen (in the centre), see Reaumur's figures, 

 &c. with which this agrees. 



Cocoon of C. perla, from Albin, pi. 64 (in the centre), see Lister on Godart, 

 fig. No. 104, and Ratzeburg Die Fbrst Insecten, lab. 16, with which this agrees. 



Larva of Drepanepteryx, from Reaumur, (upper figure under No. 6). 



Larva of an unknown species, from Reaumur, (under the above). 



Two cocoons, from Reaumur. 



Larva (] of C, reticatuta or alba), from Reaumur, covered. 



