34 Oft THE SYNONYMY OF THE TERLITES. 



Genus II. — Pteronarcys, Newman. 



The genus is founded on the reticulation of the wings, 

 which is nearly as complicated as in the genus Libellula. It 

 was first characterised in the 'Entomological Magazine,' 

 where a detailed description is given. Neither of the species 

 has ever been described under any other generic appellation. 



Sp. 1. Pter. regalis. (Corp. long-. 1 unc. alar, dilat. 3.35 unc.) 



„ „ Newman; 'Entomological Magazine,' vol. v. p. 176. 



The body is dark brown ; the head, pro- meso- and meta-thorax are mark- 

 ed by a longitudinal yellow line common to them all ; each segment of the 

 abdomen has its posterior margin yellow ; the wings are hyaline, but have 

 throughout a dingy tinge of brown, which tinge is darker along the sub- 

 costal nervure of the forewings, and terminates in a still darker spot beyond 

 the middle. The legs are brown, the knees concolorous. 



Inhabits Canada. A single specimen is in the cabinet of 

 the British Museum ; a second, purchased at the sale of Mr. 

 Lee's insects, in that of the Entomological Club. 



Sp. 2. Pter. biloba. (Corp. long. .9 unc. alar dilat. 2.75 unc). 



„ „ Newman; * Entomological Magazine,' vol. v. p. 176. 



The body is dark brown, the head has no yellow markings, the prothorax 

 has various impressed lines, and also a faint yellow spot on the anterior and 

 posterior margins ; these are connected by a still fainter line ; the mesotho- 

 rax is shining and without markings, the metathorax is also shining, and 

 has a longitudinal yellow line. The abdomen is brown, the eleventh seg- 

 ment beneath being furnished with two flat obtuse processes, which are pa- 

 rallel with the abdomen, and point towards its extremity. The forewings 

 have three very conspicuous subcostal brown spots, and the hind wings one. 

 The legs are brown and the knees concolorous. 



Inhabits North America. A single specimen (donor R. 

 Foster) is in the cabinet of the Entomological Club. 



Sp. 3. Pter. Proteus. (Corp. long. .85 unc. alar, dilat. 2.75 unc,) 



., „ Newman ; ■ Entomological Magazine,' vol. v. p. 



177. 



The body is dark brown, the head, prothorax and metathorax having an 

 interrupted longitudinal yellow line. The abdomen is brown, without the 

 appendages noticed in the last species. The wings are deeply and distinct- 

 ly variegated with brown. The legs are brown and the knees yellow. 



Inhabits North America. Three specimens (donors E. 

 Doubleday and R. Foster) are in the cabinet of the Entomo- 

 logical Club. 



