a48 IOWA ACADEMY QF SCIENCE 
which was published in 1775. The name ‘‘Hemiptera” was used 
by Linnaeus in the 10th edition of his ‘‘Systema Naturae” and 
in order to be consistent with the laws of priority we must ad- 
here to this nomenclature. 
The scope of the superfamily Pentatomoidea may be briefly 
summarized with the statement that the members are Gymno- 
cerate Heteroptera having a short, broad, lozenge-shaped body 
and a very large scutellum. Antennae usually of five segments. 
Labium with four segments. 
WORK THAT BEEN DONE ON IOWA PENTATOMOIDEA IN 
IOWA. 
Practically nothing has been done on this group in Iowa out- 
side the lists and a few notes by Professor Herbert Osborn now 
of Ohio State University. At. the time of his work on Iowa 
Hemiptera (1888-1898), Osborn was associated with the Iowa 
State Agricultural College at Ames and his specimens are now 
in the collection of that institution. All of Osborn’s notes on 
Iowa Pentatpmids were published in the Proceedings of this 
Academy and the dates together with brief summaries of his 
papers now follow in chronological order so that the historical 
setting of this work may be brought to mind. 
Proc. la. Acad. Sci., 1888, page 40, Herbert Osborn — “The 
Hemipterous Fauna of Iowa” (abstract). In this paper the 
number of families of Homoptera and Heteroptera occurring in 
the state is mentioned as well as the number of genera and spe- 
cies in each family. Twenty-one families are listed for the 
Heteroptera. Of the Pentatomoidea, the number of genera and 
species in each family is indicated as follows: 
Scutelleridse 2 genera 2 species 
Thyreocoridae 1 genus 3 species 
Cydnidae 2 genera 2 species 
Pentatomidae 17 genera 26 species 
Total ..22 genera 33 species 
Proc. la. Acad. Sci., Yol. I, Part II, 1890-1891, pages 120-131, 
Herbert Osborn— “ Catalogue of the Hemiptera of Iowa”. In 
this paper the number of species recorded from the state is 
raised to thirty-seven. They are distributed among the fam- 
ilies as follows: 
Scutelleridas 2 species 
Thyreocoridae 3 species 
Cydnidae 3 species 
Pentatomidae 29 species 
Localities and abundance only are given. 
