HYDBOPSYCHID.E. 101 



Blackish, clothed with pale yellow hairs, ferruginous beneath : 

 maxillary palpi testaceous ; 1st joint black : antennae tawny, stout : 

 legs testaceous : wings gray, clothed with yellow down. Length of 

 the body 2-J lines ; of the wings 7 lines. 



a. United States. Presented by E. Doubleday, Esq. 



11. POLYCENTROPUS CRASSICOKNIS. 



Ferrugineus,flavo-hirtuS)Subtus testaceus ; antenna fulva, robus- 

 tce ; palpi pedesque testacei ; alee subcinerecc, anticceflavo-pu- 

 bescentes et irroratce. 



Ferruginous, thickly clothed with yellow hairs, testaceous be- 

 neath : antennae tawny, robust : palpi and legs testaceous : wings 

 pale gray; fore-wings clothed with yellow down, adorned with nu- 

 merous pale yellow dots. Length of the body If 2J lines ; of the 

 wings 6 8 lines. 



Var. /3. Fore-wings without dots. 

 a e. Georgia. From Mr. Abbot's collection. 



12. POLYCENTROPUS INVABIUS. 



Fulvus, aureo-hirtus ; antennis vertice thoracisque disco nigris ; 

 pedes testacei ; alee antica subfuscce, posticce cinerece. 



Tawny, clothed with gilded hairs : crown of the head and disk 

 of the thorax black : antennae black, a little longer than the body, 

 tawny at the base : legs testaceous : fore-wings brownish ; veins fer- 

 ruginous : hind-wings gray. Length of the body 2i lines ; of the 

 wings 8 lines. 



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



Genus 3. PLECTROCNEMIA. 



Antennae alis longiores. Tibiae anticae tricalcaratae. Alas an- 

 ticae venis transversis paucis. 



Plectrocnemia, Steph. III. Brit. Ent. Hand. vi. 168 ; Westw. 

 Philopotamus p., Curt. 

 Hydropsyche p., Pictet. 



K 3 



