the Entomological Transactions, I had hoped that this deside- 

 ratum would have been supplied by my fi*iend the Rev. J. Bur- 

 rell ; and although his valuable researches upon this subject 

 have been so long withheld from the scientific world, I still hope 

 he may be induced to supply this want by its publication. 



The genus Pentatoma maybe divided into three sections: — 

 A. Thorax produced into a spine on each side; third joint of 

 antennae the longest (fig. 4. A.), containing P. bidens, 7-^iifipes, 

 ciistos and Itirida. 

 B *. Thorax angulated, broader than abdomen; antennae with 

 the third joint the shortest. P. Lynx^ Baccarum and 

 grisea. 

 * * with the second and following joints of antennae of equal 

 length. P. dissimilis and prasina. 

 C. Thorax the same breadth at its base as the abdomen ; an- 

 tennae with the basal jomt oval, second the longest (f. C.) 

 P. Juniperina^ melanocephala, pei'lata, festiva, oleracea 

 and carulea. 

 In Mr. Vigors's cabinet is a species which belongs to this last 

 division, received from Dr. Leach with the name of P. picta. 

 It agrees tolerably well with the description in Fabricius, but 

 I believe that Dr. L. was not satisfied of its authenticity as a 

 British species. 



Although Cimex hccmorrhoidalis, litiirata and agathina have 

 always heen included in the genus Pentatoma^ I was very much 

 inclined to think that they possessed good characters to esta- 

 blish a distmct genus; and upon a carefiil investigation, (exclu- 

 sive of the antennae having the first joint equal in length to any 

 of the others, vide fig. B., and of a curious keel-shaped ridge 

 arising near the extremity of the abdomen beneath, and pass- 

 ing between the legs nearly up to the head,) the tarsi consist of 

 but two joints, which do not agree with the characters even of 

 the famUy laid down by Mons. Latreille and Dr. Leach. I 

 shall take the first opportmiity of describing this group, which 

 I propose calHng Acanthosoma. 



P. cocndea flies well in the sun-shine, and is to be met with 

 about July in Coombe Wood, upon the leaves of trees in the 

 heat of the day. I have taken it between Linton and Exmoor, 

 upon heath, at the end of September. The natural size is shown 

 by the smaller insect upon the plant Erysiimtm cheiranthoides 

 (Treacle Worm-seed), 



