So little are these minuter Hymenoptera understood, that 

 this genus has never been recorded even as British ; and it is 

 remarkable that only one species has ever been described by 

 continental writers. I have now seen upwards of sixty species 

 taken by Mr. Haliday, Mr. F. Walker, and myself. It is 

 evident that they do not vary in figure and character less 

 amongst themselves, than they do from the typical form, as 

 will be shown by the following divisions with which Mr. Ha- 

 liday has kindly furnished me. The insect dissected I pre- 

 ferred to the type, not only because it is the largest of the ge- 

 nus, but from my being acquainted with the sexes. 



Div. 1. Antennas 11-jointed; wings with the stigma sub- 

 trigonate or suborbicular. The Antennae shorter, the 

 scape longer and the apex incrassated in the females. 



1. C. Dux Nob. Length two lines, breadth three. Black, 



shining, base of tibiae and tarsi ferruginous. Superior 

 wings with a fuscous cloud. Mr. Haliday, Ireland. 



2. opacus Hal. MSS. Mr. Haliday, Ireland. 



3. cimicoides Hal. MSS. m. Sept. Holywood, Downshire. 



4. rufiscapus Nob. Norfolk. 



5. rufipes Nob. Norfolk. 



6. nitidus Nob. Mr. Walker. 



7. su\ca.tusjur.pl.l4f. — 24-th July,pales,Hampstead Heath. 



8. puliciformis Nob. 



9. crispus Hal. MSS. Aug. Holywood. 



10. Carpenteri Nob. Black, head and thorax pubescent, 



body shining; apex of thighs, tibiae and tarsi ochre- 

 ous. Antennae in the male similar to those of the 

 same sex in Eurytoma abrotani. I have the pleasure 

 of naming this curious insect after Thomas Car- 

 penter, Esq. who bred it from female Aphides. 



11. elegans iv^o6. Mr. Walker. 



1 2. Halidayi Nob. pi. 249. This beautiful little insect I have 



dedicated to A. H. Haliday, Esq. a zealous advocate 

 of Entomology, whose knowledge of these beautiful 

 tribes is only equalled by the liberality with which it 

 is imparted to others for the advancement of science. 

 It was taken the 8th of Aug. near Holywood. 



13. gracilis Nob. Mr. Haliday. 

 Div. 2. Apterous. 



14. C. ruficollis Hal. MSS. May, Kensington Gardens. 



15. Rubi Nob. e. Aug. upon bramble leaves, near Heron 



Court, Hants. 



16. melanocephalus Hal. MSS. June, Oct. Shady groves. 

 Div. 3. Wings with a linear branch, but no stigma. 



1 7. longipennis Nob. Mr. Haliday and Mr. Walker. 

 Div. 4. Antennae 10-jointed. 



18. C. ferrugineus Hal. MSS. July 8, Holywood. 



19. discolor Hal. MSS. Aug. Sept. Holywood. 



20. nubilipennis Nob. Mr. Walker and Mr. Haliday. 

 The plant is Lathyriis pratcnsis (Meadow Vetchhng). 



