04 
Bulletin Wisconsin Natural History Society 
[Yol. 13, No. 2 
This description of the occiput does not at all agree with the 
description and figures of the bred specimens. Williamson’s 
remarks were accepted as sufficiently diagnostic and «o noted 
in Muttkowski’s Catalogue of Odonata. However, in view of 
the present description it is safe to say that the mentioned re- 
marks pertain net at all to Gomphus cornutus, but probably 
to some closely related form. Since G. furcifer which might 
come into consideration is to be distinguished by the straight 
occiput, and the black dorsum of eight, the writers hazard the 
guess that the specimen in question is probably a female of 
Gomphus whedoni Muttk. Of course, this supposition can only 
be confirmed by actual examination of the specimen in question. 
Needham and Hart (1901) record the fact of its description 
and note some specimens in the “Bolter Collection, but without 
data.” 
Miller (1906) recorded a female from Iowa. “One female 
in poor condition, not fit for description, probably belongs here 
though the female has not been described.” The determination 
of the specimen had been made by Williamson. 
Muttkowski published a description of G. cornutus in 1908. 
As a Wisconsin record a specimen from Dane County (sex not 
quoted) was cited. This specimen has since then been exam- 
ined; it is a female of G. furcifer. 
Walker in 1908 published a record for Ottawa, Canada and 
mentions Iowa and Illinois as other localities. The specimen 
was figured by Walker. 
In 1910 Muttkowski recorded its capture for Milwaukee County 
in Wisconsin and added ecological notes and a reference to the 
subgenus. 
In 1913 Muttkowski reprinted Tough’s description in a paper 
describing Gomphus whedoni n. sp., using it for comparison with 
the new form. Both species were figured. 
Williamson in 1914 accords G. cornutus some consideration in 
discussing its relatives in the* subgenus Arigomphus. In his 
interesting discussion of the members of the group Arigomphus 
Williamson lists nine species under this subgenus, basing his 
selection on characters previously summarized. The nine species 
are given as follows: 
