AQUATIC INSECTS IN NEW YORK STATD 315 
® Supraspiracular setae of the first six abdominal segments forming a 
single continuous group of setae 
e Sternal setae of the fifth abdominal segment divided longitudinally 
by a mesal line into two groups; the posterior sternal setae of the 
mesothorax undivided 
d Sternal setae of the seventh abdominal segment distinctly di- 
vided into two groups; the infraspiracular setae of the seventh 
abdominal segment not longer than broad...cincticornis 
dd Sternal setae of the seventh abdominal segment continuous; the 
infraspiracular setae of the seventh abdominal segment twice 
PASM ONDE ASO er cata, Gp iay st ete eth gale 4 Wu cae ee palmata 
ce Sternal setae of the fifth abdominal segment not divided; the pos- 
terior sternal setae of the mesothorax not divided longitudinally 
into two groups 
d Supraspiracular setae of the sixth and seventh abdominal seg- 
ments coalesced with the outer ends of their posterior tergal 
ed MM EE CORA cre recniy GeeRe ayers watts. Mies idl rae eerie oie thor Spo 8 wc subtilis 
dd Supraspiracular setae of the sixth and seventh abdominal seg- 
ments not extending as far caudad as the posterior tergal setae 
mt porosicollis 
bb Supraspiracular setae of the first six abdominal segments divided 
transversely into two well marked groups............. aequalis 
aa Supraspiracular setae of the first five abdominal segments extending 
caudad as far as the caudal margin of the posterior tergal setae 
emarginata 
Pupa 
a Antennae with the third segment distinctly longer than the second 
palmata 
ada Antennae with the second and third segments subequal 
b Prothorax distinctly tuberculate on the side; the pronotum with an 
PAN OGSSS eC MMO sat WA TCLS G8, Ga isvarchusnlsls, Sle ccce sags » atwleelelm 6, dete aequalis 
6b Prothorax not tuberculate on the side; the pronotum not with an 
impressed line at middle 
c First abdominal segment as long as, or longer than, the next four 
segments 
d Mesosternum between the coxae nearly as broad as the coxae 
; cineticornis 
dd Mesosternum between the coxae about one half the width of the 
CORA MONS LORS iit ea teacMa ee cute staat gat Su abn ka ae St wepR subtilis 
ce Iirst abdominal segment as long as the next three segments 
emarginata 
Imago! 
a Head and thorax evidently pubescent above 
b Hlytra without pubescence 
c Posterior femora with a small tooth........6...6.. hirticollis 
HO HOOSUCIION TeMOU: SIMDIG, ., cca cr ae ve nc Cave vauray nes pubicollis 
bb Elytra evidently pubescent; posterior femora toothed..pubescens 
1This table was compiled from a table by Charles W. Leng. Revision 
of the Donaciae of Boreal America, Am, Ent. Soc. Trans. 1891, 17:159-76, 
