May, 1953 Burks: THE MaAyr.iss oF ILLINOIS 15 
Table 1—Mayfly species described by Benjamin D. Walsh in 1862 and 1863, and status 
of lectotypes designated by Nathan Banks from specimens collected by Walsh and deposited by 
Herman A. Hagen in the Museum of Comparative Zoology, Harvard University, Cambridge, 
Massachusetts. 
WaALsH SPECIES MCZ Type No. ConDITION LABEL 
Species DEscRIBED IN 1862 
Baetis sicca 11248,¢9 Good B. sicca & Rock Island 
Walsh 672 
Potamanthus odonatus* a — = 
Palingenia vittigera* — _ _ 
Palingenia flavescens P2525 Good Rock Island Walsh 675 
Palingenia pulchella MIDSiteG Bleached; Rock Island Walsh 677 
genitalia 
gone 
Palingenia terminata LL2535.0" Good Rock Island Walsh 679 
Ephemera flaveola 11210, ¢ Good E. flaveola Rock Island 
Walsh 688 
Ephemerella excrucians 11213, o Good; Ephemerella excrucians & 
genitalia Rock Island Walsh 691 
on slide 
Ephemerella consimilis* ~ — — 
Cloe ferruginea* — — — 
Cloe fluctuans* — — — 
Cloe dubia 11214, 9 Genitalia Rock Island Walsh 700 
broken 
Cloe mendax 11215, 9 Faded Rock Island Walsh 697 
Species DeEscrIBED IN 1863 
Baetis interlineata Undesignated Good Baetis femorata Say 
Rock Island 1863 
Pentagenia quadripunctata* — — — 
Heptagenia simplex 112507 — —_ 
Heptagenia cruentata* — — — 
Heptagenia maculipennis 11249, 9 Badly maculipennis & Rock 
broken Island Walsh 683 
Ephemera myops Mm 209%% — — 
Cloe propinqua BDAT Frey Good Cl. propingua Walsh Rock 
Island, not Hagen 667 
* Type material missing. 
7 Should be disregarded; 
** Should be disregarded, 
as specimen was collected in 
1860. He amassed a large collection of 
mayflies, principally from and near his home 
at Rock Island, Illinois. He also collected 
a few specimens from Coal Valley Creek, 
a tributary of the Rock River, in Rock 
Island County; from the Des Plaines River 
near Chicago; and from southern Illinois, 
along the Ohio River. He preserved all 
the specimens dry, on pins, and made care- 
ful notes on the colors of the specimens while 
they were still alive or very shortly after 
their death. 
By 1862, Walsh had segregated these 
mayfly specimens to genera and _ species, 
basing his determinations principally on 
Hagen’s Synopsis of the Neuroptera of 
North America (1861). He published the 
results of these studies in 1862. In his 
paper, he described 26 species of mayflies, of 
which he considered 13 to be new; 7 he 
see McDunnough 1929:179 and Bee 184 below. 
1864. 
identified as species previously described by 
Say or Pictet, and the remaining 6 he 
questionably referred to species described 
by Say, Walker, or Hagen. He also de- 
scribed two new genera of mayflies in his 
paper. 
Shortly after the publication of this work, 
Walsh sent duplicate specimens of most of 
these species to Hagen, then living and work- 
ing in Koenigsberg, Prussia. Hagen ex- 
amined these specimens and returned critical 
notes to Walsh concerning them. These 
notes were published (Hagen 1863) along 
with Walsh’s further observations on the 
species, in the light of Hagen’s comments 
(Walsh 1863). In this latter paper, Walsh 
described three additional new genera and 
five new species; he also provided new names 
for two species he had misidentified in his 
first paper. 
