Manchester Memoirs, Vol. xliii. ( 1 899), No. 9. 



IX. Description of a genus and species, probably 

 representing a new tribe of Hymenoptera from 

 Chili. 



By p. Cameron. 

 \Communicated by J. Cosmo Melvill, M.A., F.L.S.] 



Received attd read December 13th, i8gS. 



The systematic position of Westwood's genus, Tri- 

 gonalySy has been much discussed by writers on the group. 

 St, Farjeau {Hymen, iii. 561) regarded its affinities as 

 doubtful, but hinted at its having some relationship to 

 Tiphia. That, however, it cannot be included in the 

 aculeate section of the order is shown by its antennae 

 having more than thirteen joints, and by the trochanters 

 being bi-articulate. By recent writers it has either been 

 regarded as the type of a distinct family or as a tribe of the 

 Evaniidce. The latter is the view of the Rev. T. A. Marshall, 

 who, in his Cat. Brit. Hymen., p. 133, places the genus 

 in the Aulacides, but it is not so included by Schletterer 

 in his monograph of that group {Ann. Hof-Miis. Wien, 

 1889-90). Foerster {Ueber den systemat. Werth des 

 Flugelgedders b. d. Hymen., 1877) treats it as a distinct 

 family, in which he is followed by Cresson {Trans. Amer. 

 Entom. Soc., 1887, Supp., p. 23). 



The systematic position of Trigonalys is undoubtedly 

 a difficult one, as is also the position of Pelecinus, 

 Stephanus, and the Australian genus Megelyra, all of which 

 stand out more or less isolated from the Ichneumonidce, 

 Braconidce and, to a less extent perhaps, from the 

 Evaniidce. 



In the Trans. Entom. Soc., 1868, p. 328, Westwood 



September 8th, i8gg. 



