New species of Stenotothorax Schmidt from the northwestern United States (Coleoptera: Scarabaeidae: Aphodiinae)
Author
Skelley, Paul E.
Author
McPeak, Ron H.
text
Insecta Mundi
2018
2018-12-28
681
1
31
journal article
10.5281/zenodo.3715079
ffcbe161-01d4-43e5-9ea8-4b4b5a70551e
1942-1354
3715079
8C5707A6-D245-485D-BFD0-BA469DD61F35
Stenotothorax mcpeaki
Gordon and Skelley
Figure 25
Stenotothorax mcpeaki
Gordon and Skelley 2007: 207–208
.
Diagnosis.
Stenotothorax mcpeaki
is distinguished from other species in the region by the clypeus lacking teeth and setal fringe, the complete basal pronotal marginal line, and the explanate pronotum.
Stenotothorax mcpeaki
appears to be restricted to sites near the Columbia River along the
Oregon
and
Washington
border, east of the Cascade Mountains.
Gordon and Skelley (2007)
did not have a male present for the original description. We take this opportunity to describe male characters from topotypic specimens.
Male.
Male genitalia with parameres shorter than basal piece, abruptly curved and acutely pointed apically in lateral view (similar to
S. smilodon
, as in
Fig. 41
). Sexual dimorphism evident in male with short stout lower mesotibial spur, length about 1/3 length of upper spur, with inward apical hook. Male protibia narrower than female.
Type
material.
Oregon
, Wasco Co.,
6 mi.
E. of The Dalles (
USNM
, examined).
Materials studied.
(
n =
142) Collection data for materials confirmed to be
S. mcpeaki
are:
OREGON
:
Gillam Co.
:
John Day River & Rock Creek,
0.5 mi.
S. of
McDonald
,
45°34.858′N
,
120°24.378′W
,
384 ft
,
10-XI-2015
,
P.E. Skelley
,
K.E. Schnepp
,
R.H. McPeak
,
K. Arguez
[2
FSCA
, 6
KESC
]
;
Rock Creek
&
John Day River
,
45°34.858′N
,
120°24.378′W
,
384 ft
,
10-XI-2015
to
1-IV-2016
, R.H.
McPeak
[4
FSCA
, 3
RMPC
]
;
Wasco Co.
:
5.2 mi.
E. of
The Dalles
on
I-84
,
4-XII-2008
to
22-I-2009
,
R.H. McPeak
, [1
RMPC
]
;
same locality,
22-I to 25-IV-2009
, R.H.
McPeak
[3
RMPC
]
;
6 mi.
E. of
The Dalles
,
45°38.847′N
,
121°02.454′W
,
11-22-III-2005
, R.H.
McPeak
[1
FSCA
; [2
RMPC
]
;
same locality,
14-30-XI-2007
, R.H.
McPeak
[2
FSCA
]
;
6 mi.
E. of
The Dalles
eastbound
I-84
,
45°38.846′N
,
121°02.458′W
,
7-X-17-XII-2007
, R.H.
McPeak
[1
ODA
, 5
RMPC
, 2
WBWC
]
;
same locality,
30-XI-2007
to
19-I-2008
, R.H.
McPeak
[1
ODA
, 20
RMPC
]
;
same locality,
19-I-2008
to
12-IV-2008
, R.H.
McPeak
[1
RMPC
]
;
same locality,
23-X-19-XI-2011
, R.
McPeak
[5
FSCA
]
;
same locality,
20-XI-19-XII-2011
, P.
Skelley
, R.H.
McPeak
[3
CMNC
, 2
DCGC
, 18
FSCA
, 2
NHML
, 1
RMPC
, 2
WBWC
, 2
WSU
]
;
same locality,
19-XII-2011
to
30-I-2012
, R.H.
McPeak
[10
RMPC
]
;
6.3 mi.
N.
Dufur on Hwy
197,
29-IX-2008
, R.H.
McPeak
[1
RMPC
]
;
mouth of
Deschutes R.
at
Columbia
R.,
45°37.757′N
,
120°54.822′W
,
24-XI-2013
to
10-I-2014
,
R.H. McPeak
[1
RMPC
]
;
Rufus
,
45°41.444′N
,
120°44.409′W
,
235 ft
,
23-IX-2013
to
10-I-2014
, R.H.
McPeak
[3
FSCA
, 1
RMPC
]
;
same locality,
10-I-2014
to
14-XI-2014
, R.H.
McPeak
[1
RMPC
]
;
The Dalles
, nr.
Discovery Center
,
45°38.912′N
,
121°12.699′W
,
170 ft
,
30-XI-2013
to
10-I-2014
, R.H.
McPeak
[2
RMPC
]
;
same locality,
10-I-21-II-2014
, R.H.
McPeak
[1
FSCA
]
;
Tygh Valley
,
45°15.404′N
,
121°10.529′W
,
1196 ft
,
8-XI-2013
, R.H.
McPeak
[3
RMPC
]
;
same locality,
5-IX-2013
to
10-I-2014
, R.H.
McPeak
[10
FSCA
, 13
RMPC
]
;
same locality,
10-I-2014
to
21-XI- 2014
, R.H.
McPeak
[3
RMPC
]
;
same locality,
11-XI-2014
, K.E.
Schnepp
[1
KESC
]
.
Washington
:
Klickitat Co.
:
Avery Park
;
1.5 mi.
E
,
45°39.561′N
,
121°00.522′W
,
200 ft
,
20-XI-2011
to
30-I-2012
, R.H.
McPeak
[1
FSCA
]
;
Dallesport
;
100 m
east of
Hwy
197,
45°37.604′N
,
121°08.825′W
,
200 ft
,
23-XI-2013
to
10-I-2014
,
R.H. McPeak
[1
FSCA
]
;
Dallesport
; dunes to NW,
45°38.182′N
,
121°11.376′W
,
145 ft
,
30-XI-2013
to
21-II-2014
, R.H.
McPeak
[1
RMPC
]
.
Observed habits.
Specimens have been collected in barrier pitfall traps in grasslands with many pocket gopher and ground squirrel nests, in sandy areas with sage brush, in
Thomomys
Wied-Neuwied
burrows, from backfilled
Thomomys
burrows, in ground squirrel burrows, under fresh slimy deer bone, coyote scat, and in sand under dune shrubs.
Remarks.
Stenotothorax mcpeaki
is most similar to
S. smilodon
, see remarks under that species.