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VIII. Descriptions of Chalcidites. By Francis Walker, Esq., F.L.S. 8fc. 8fc. 



Bead June 17th, 1845. 



.1 HE following communication contains a description of species not included 

 in my previous publications on Chalcidites in the ' Entomological Magazine,' 

 the 'Annals of Natural History,' the 'Entomologist,' and the ' Monographia 

 Chalciditum.' In these works further information will be found respecting 

 the genera and species mentioned as being related to those here described. 



Pteromalus, Swedems. 



This genus comprises a great number of species, somewhat similar in struc- 

 ture, and having, comparatively speaking, one unvarying form, while its out- 

 skirts, or the subgenera whereby it passes into other families, are diverse in 

 appearance, and contain but few species. In the ' Entomological Magazine' 

 (vols. ii. and iii.), and in the ' Monographia Chalciditum' (vol. i.), I have at- 

 tempted to describe the characters of the British species of this genus, and to 

 indicate their divisions into groups. In the second volume of the last-men- 

 tioned work, and in some numbers of the ' Annals of Natural History,' I have 

 mentioned several exotic species. The characters that I have given are de- 

 fective, owing to the omission of the structure of the metathorax or propodeon. 

 The antennae in the following species are nearly similar in structure ; the first 

 joint is long and slender ; the second is cyathiform ; the third and fourth are 

 very minute ; the following joints to the tenth successively decrease in length. 

 The head and thorax are finely squameous ; the abdomen is smooth. 



Pteromalus Acrotatus, fem. Viridis, abdomine cupreo, antennis piceis, pe- 



dibus fulvis, coxis femoribusque basi viridibus, alls fuscis. 

 Corp. long. lln. I ; alar. lin. 1|. . . 



Body shining, rather short : head and thorax green : head broader than the thorax : antenna 

 clavate, dark piceous, a little longer than the thorax ; first joint fulvous ; club conical, 

 VOL. XX. X 



