[OWA ACADEMY OP SCIENCES. 
235 
In working over the additional materia] accumulated, and in 
rearranging the Orthopterous collection of the Iowa Agricul- 
tural college during the early part of the year several addi- 
tional species were found; these, with some material collected 
in Lyon and Mahaska counties several years ago, together 
with the collecting of the present season at Ames, have fur- 
nished the basis for an addition of some 30 species to the list 
published by Professor Osborn in the proceedings of this 
academy for 1891. 
Owing to the fact that there has been considerable revision 
in nomenclature and synonomy since the publication of the 
former list, thus rendering necessary a number of changes, 
and further that a majority of the species would be included in 
the notes, it has been thought best to make the list of species 
complete, although in a number of cases nothing additional can 
be given. 
The arrangement of families in the list is purely arbitrary, 
for as yet there seems to be no satisfactory arrangement based 
upon philogenetic deductions. Within the families the ordi- 
nary arrangement has been adopted except where there has 
been recently suggested changes. In the groups Tettiginse 
and Tryxalinas, Prof. A. P. Morse’s recent revision has been 
followed and in the Tettiginae he has kindly verified all the 
determinations. To Professor Scudder I am indebted for the 
determination of the Ceuthophilus listed. Y/hile to Professor 
Lawrence Bruner I am under obligations for the determination 
of a number of species and the verification of the greater portion 
of the remainder of the list. 
ORDER ORTHOPTERA. 
Fam. PORFicuLiD^— Earwigs. 
LaMa minor Linn, A few specimens taken each year. 
Pam. blattid.p: — Cockroaches 
Ectobia germanica Steph. Common in stores and houses in 
towns. 
IscJinoptera unicolor Scudd. Occasionally taken at Ames. 
Specimens were found abundantly in the timber around 
Oskaloosa in June. 
IscJinoptera pennsylvanica DeGeer. Abundant in the timber 
along the larger streams. Adults during earl^r summer, disap- 
pearing by the middle of July. 
Periplaneta orientalis Linn. This introduced species, which 
was formerly confined to a few of the larger cities, has spread 
