4a INTRODUCTORY REMARKS. . 



the aculeiis, and it might be placed at the head of 

 the Artificial Character ^ in the formation of which 

 recourse may likewise be had, where they are con- 

 stant to the palpi (r), the valvul(E{s), the eyes{t)y 

 the antennae (u), collum(x), thorax (y), ivings(z), 

 thighs (a), ahdomen{h)j its petiolus [c), and the 

 aculeus(d). 



I shall now throw out a few hints concerning 

 some improvements of which the characters of the 

 different genera in this class seem capable. With 

 respect to Cynips, after excluding the first member 

 of the Linnean Arlijicial Character, which is partly 

 common to the whole class, and partly not true, 

 there will remain only the aculeus. To this I would 

 add the following circumstances, which distinguish 

 all the species of the genus that I am acquainted 

 with. 



CYNIPS. Lingua inconspicua. 



Antennce . ^Xiiorv^QS articulis 15. 



(Geqfroy) (e). 

 AltP subvenosae. 

 Abdomen compressum subtus cari- 



natum. (De Geer). 

 Aculeus spiralis saspius reconditus. 

 [Lin7ieiis). 



(r) Sirex, Ichneumoji, &c, {s) Ammophlla. (t) I'espa, &c. 

 (u) Ichneumon, Cynips, &c. (x) Ammophila. (y) Mutilla. 

 (2) Vespa, Sec. (a) Chalcis. {f;) Chrysis, Philanthus. 

 (c) Fornrica. (d) Cynips, Tenthredo, Sirex. 



(e) GeofFroy says 14, but I have included the radicle, or mi- 

 nute joint which unites them to the head. 



The 



