PERLIDF.S. 145 



Pitchy black: head hardly broader than the thorax, yellow be- 

 neath and at the base of the antennae, and with a yellow liiang'ular 

 spot on the hind-border, which is also y<llow : prothorax rnjT^nlose, 

 with a yellow middle stripe, not broader in front ; sides straijjht : 

 angles rather sliarp ; under side yellow : wings very slightly gray : 

 veins black ; external basilar areolet with six transverse veins ; ter- 

 minal ;ire(det with two transverse veins ; terminal part of the sub- 

 marginal areolet with no transverse veins ; submedian areolet with 

 six transverse veins. Length of the body 4 lines; of the wings 12 

 lines. 

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



G. Barnston, Esq. 



13. Perla media. 



Ni(/ra ; caput thorace paulln latins, laterihus, margine posticn, ma- 

 culisque duahusflavu-ffrrwjineis; prolliorax valde ruyulosiis, 

 antice mnlto latiu.s, sulco dorsali, amjulis anticis sat acutis, 

 posticis rotundatis ; alis subcmereh. 



Perla media, Barnston, MSS. 



Black : head a little broader than the thorax, ferruginous 

 mixed with yellow on each side and behind, and with two spots of 

 that colour diverging from each other on the vertex towards the 

 fore-border: scutum very rugnlose, with a slight middle furrow, 

 much broader in front ; hind-angles rounded ; fore-angles rather 

 sharp: wings very slightly gray ; veins black ; external basilar areo- 

 let with thirteen transverse veins ; terminal areolet with three trans- 

 verse veins ; tenninal part of the submarginal areolet with no trans- 

 verse veins ; submedian areolet witli eight transverse veins. Length 

 of the body 6 lines ; of the wings 16 lines. 



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

 G. Barnston, Esq. 



14. Perla nlres. 



Caput macula flava occipitali ; prutlmrax omnino nit/vr, longitudinr 

 paullo latins. 



Perla nubes, Piclrt, Hist. Nat. i\cur. Perl. 171, i), pi. !>, f. 7, 8. 



America. 



