170 PEBLIDES. 



Perla citrinella, Barnston, MSS. Newport, Proc. Linn. Soc. Lond. 

 (1848), i. 388, 6. 



Pale luteous, shining : head not broader than the thorax : eyes 

 and ocelli black : antennae brown, pale towards the base : scutum 

 minutely rugulose, blackish on the fore border and along the longi- 

 tudinal furrow, rounded on each side, not angular nor broader in 

 front : wings quite colourless ; veins pale yellow ; external basilar 

 areolet with four transverse veins ; terminal areolet with one or two 

 transverse veins ; submedian areolet with four transverse veins. 

 Length of the body 3 lines ; of the wings 10 lines. 



a, b. St. Martin's Falls, Albany River, Hudson's Bay. Presented 



by G. Barnston, Esq. 

 c. Nova Scotia. From Lieut. Redman's collection. 



98. PERLA DECOLOKATA. 



Pallide testacea ; caput thorace paullo latins, macula angulari ni- 

 gricante ; scutum fusco bimaculatum ; alee hyalince. 



Pale testaceous : head a little broader than the thorax, with a 

 blackish irregular mark extending forwards from the ocelli, truncate 

 in front : eyes and ocelli black : antennae very minutely pubescent: 

 scutum minutely rugulose, with a longitudinal furrow, not broader 

 in front, a large oblong brown spot on each side ; sides almost 

 straight ; angles rather sharp : wings hyaline ; veins black, testa- 

 ceous towards the base. Length of the body 4 lines ; of the wings 

 12 lines. 



a, b. Great Bear Lake, N. America. Presented by Sir John Ri- 

 chardson. 



99. PERLA DECISA. 



Ferruginea, nitens, subtus testacea ; antenna fusccB ; scutum sub- 

 quadratum, angulis sat acutis ; alee anticce subcinerece. 



Ferruginous, shining, testaceous beneath : head testaceous in 

 front, a little broader than the thorax : antennae brown, minutely 

 pubescent : scutum minutely rugulose, subquadrate ; angles rather 

 sharp : wings slightly gray ; veins black ; external basilar areolet 

 with four transverse veins ; terminal areolet with three transverse 

 veins ; submedian areolet with five transverse veins. Length of the 

 body 3J lines; of the wings 11 lines. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



