272 [October 
The following Errata and Corrigenda may be noticed as occurring in my 
Paper in Proc. Acad. Nat. Sciences of Philadelphia:— 
p. 361, line 15, for (South Illinois)” read (North and South Illinois).” 
p. 364, line 3, for ^‘length ” read ‘^length % abdomen.” 
p. 365, dele line 18 ^^no appearance of any suture.” 
p. “ dele lines 6—4 from bottom, repeated from lines 15—13 from bottom, 
p. 371, line 27, dele ^‘excejot the last segment.” 
p. 376, line 23, for Alar exp. 9 ” i^ead Alar exp. % .” 
p. 381, lines 17 and 21, for “undata’' read “fluctuans.” 
p. 383, last line, for behind” read ^‘before” 
p. 387, line 27, for ‘‘triangular brown spot” read “ triangular spot, brown.” 
p. 393, Table, line 3, for “long, slender, yellowish” read “absent.” 
“ “ line 4, for “yellow?” read “yellow, banded with black.” 
p. 394, line 20, for “quadrangular” read “rectangular.” 
p. 397, Table, last line, for “3^” read “31^.” 
jj. “ line 6 from bottom, for “two inside” read “two inside;” 
}:>. 401, 1st column, line 15 from bottom, for “-13 sp.” read 
“ Isopteryx cydijDjoe Newm. 
Capnia minima Newj). 
Taeniopteryx fasciata Burm. 
Nemoura completa Walk. 
-17 sp.” 
p. 401, 2nd column, line 15 from bottom, for “binotatum” read “binotatum 
n. sp.” 
p. 402, 2nd column, line 6 from bottom, for “Perlina-13--19” read 
“ Perlina-17-9.” 
p. 2nd column, last line, for “ 106” read “ 110.” 
Rock Is/and, Illinois^ Sept. 21, 1863. 
