THE ENTOMOLOGIST. 



499 



Ichneumon atomus, Linn., is probably one of the Myma- 

 ridse, but the mention of it as such is sufficient, the description 

 not being suitable for the limits of a species. Nees ab Esen- 

 beck established two genera — Gonatocerus and Eutriche — in 

 this family, which he considered as Chalcidiae. Haliday 

 separated them as a family, with a systematic arrangement 

 of the genera into which he divided them. Foerster after- 

 wards elaborated them, and his Synopsis is here translated as 

 follows : — 



A. Tarsi 5-jointed. 



a. Abdomen distinctly petiolated. 



* Antennae of the male 10-jointed, of the female 



9-joiuted. .... Camptoptera. 



** Antennae of the male 13-jointed, of the female 



11-jointed. .... - Ooctonus. 



b. Abdomen sessile, or nearly sessile. 



Male. 



* Marginal branch extending to the middle of the 



costa. ..... LiMACis. 



** Marginal branch not extending to the middle of 

 the costa. 



f Antennae 13-joiuted. 

 ft Antennae 10-joiuted. 



gonatoceeus. 

 Alaptus. 



Female. 



t 



B. 

 a. 



Antennae 11-jointed. - - - Gonatocerus. 



Antennae 9-jointed. ... - Litus. 



Antennae 8-jointed. 

 Marginal branch extending to the middle of the 



costa. ..... LiMACis. 



Marginal branch not extending to the middle of 



the costa. ..... Alaptus. 



Tarsi 4-jointed. 



Club of the antennae with two joints. 



Marginal branch very long. Tarsi of the four 



hinder legs shorter than the tibiae. - - Eustochus. 



Marginal branch very short. Tarsi of the four 



hinder legs longer than the tibiae. - - DoRrcLYTus. 



C]^b of the antennae not jointed. 

 Abdomen distinctly petiolated. 



Fore wings only widened at the tips. - - Mimar. 



Fore wings widened throughout. 



