1977] 
Fiance — Genera of Chloroperlidae 
309 
Separation of larvae to the specific level appears to be quite 
difficult, but may become possible by employing relative differ- 
ences in the distribution of setae on the lateral surfaces of the head, 
dorsum of the legs, pronotum, eighth tergite, and mouthparts. 
Table 1. Chloroperlidae of Eastern North America 
PARAPERLINAE 
U taper la gaspesiana 
CHLOROPERL1NAE 
Alloperla 
Hastaperla 
atlanticum 
brevis 
banksi 
orpha 
caudata 
Suwallia 
chloris 
marginata 
concolor 
Sweltsa 
idei 
lateralis 
imbecilla 
mediana 
quadrat a 
nainina 
leonarda 
naica 
neglecta 
onkos 
usa 
urticae 
voinae 
Rasvena 
vostocki 
terna 
A KEY TO THE LARVAE OF 
EASTERN NORTH AMERICAN CHLOROPERLIDAE 
1. Extensor surface of hind leg lacking a well developed fringe of 
fine, long setae (Fig. IF); basal cereal segments having many 
long setae in apical corona, visible in lateral view (Fig. 1C) . . . 
Utaperla gaspesiana 
-. Hind tibia and often femur with a well developed fringe of long, 
fine setae on extensor surface (Fig. 2F); basal segments of cerci 
having few long setae in apical corona visible in lateral view 
(Fig. 2-5 C) 2 
2. Cerci with numerous long setae between apical coronas on dis- 
tal segments forming a feather-like surface visible in lateral view 
(Fig. 2C); pronotum having few or no setae on front and hind 
margins, setae present only at corners (Fig. 2B); eighth tergite 
lacking setae at mesal posterior margin (Fig. 2D); integument 
yellow-gold Alloperla (s.s.) 
