ON THE SYNONYMY OF THE PERLITES. 89 



Inhabits Georgia. There are two specimens in the British 

 Museum. 



Sp. 9. Chlo. bifrons. (Corp. long. .3 unc. alar, clilat. .65 unc.) CctAwvvQ* 



A, „ Newman, ' Entom. Mag.' vol. v. p. 401. 



Entirely of a dark shining brown, wings tinged with brown, the nervures » 

 being rather darker : the antenna and caudal seta are of about the same 

 length, which is nearly equal to that of the body. 



Inhabits Scotland; taken by Mr. Walker at New Lanark. 

 In the cabinets of the Entomological Club and Mr. Stephens. 



Sp. 10. Chlo. nigra. (Corp. long. .37 unc. alar, dilat. .75 unc.) 



Perla nigra, Pictet, 'Annales des Sciences Naturelles,' vol. xxviii. 

 p. 61. tab. vi.fig. 11, 13. 



Entirely of a shining black colour : it is extremely slender, the legs and 

 antenna being remarkably slight; the wings are opaque at the base and hy- 

 aline at the tip. 



Inhabits Switzerland, where it takes short and rapid flights 

 among the stones on the banks of rivers : it is very difficult 

 to capture this delicate insect without spoiling it. In the ca- 

 binet of M. Pictet of Geneva. 



Sp. 11. Chlo. Opis. Nigra, nitida, concolor ; prothoracis latera con vexa 

 alae obscurae fusco tinctae, nervuris saturatioribus. (Corp. long. .2 unc. 

 alar, dilat. .5 unc.) 



Entirely black, shining: the prothorax is rather wider than the head, and 

 its sides are very convex, the antenna are about as long as the body, the 

 caudal seta longer, and have the joints remarkably long and distinct: the 

 wings are tinged with brown and the nervures are darker ; the femora are 

 black, the tibia and tarsi brown. 



This little insect inhabits Newfoundland. The only two 

 specimens I have seen are in Mr. Westwood's cabinet^ and 

 have been kindly lent to me for description. 



Genus VI. — Leptoperla, Newman. 



Proalarum nervurae apicales paralleles 6, nervuris transversis numerosis 

 intersectae : antennae setaeque caudales elongatae ; pedes elongati. 



Sp. 1. Leptoperla Bero'e. Fusca; alae opacae, fuscae, versus apicem ma- 

 culis albidis notatae ; pro- et mesopedes fusci, tibiis medio testaceis : 

 metafemora testacea, apice fusca. (Corp. long. .3 unc. ant. .475 unc. 

 set. caud. .475 unc. alar, dilat. .9 unc.) 



This is a slender and very elegant insect ; it differs generically from Iso- 

 genus and Perla in the neuration of the fore wings, the exterior portion of 

 which is occupied by six strong parallel longitudinal nervures; of these the 

 fourth is furcate at the extremity, and the fifth unites with the fourth just 

 before its furcation ; these longitudinal nervures are intersected by several 

 very delicate transverse nervures: the antenna and caudal seta are extremely 

 slender, and much longer than the body of the insect ; the tenninal segment 

 of the abdomen below is furnished with two leaf-like processes, which curve 



Vol. III.— No. 26, n. s. i 



