Eremochelis bilobatus (Muma 1951)
Datames pallipes Say: Simon, 1879a: 139-142
(misidentification, in part).
Eremobates pallipes (Say): Kraepelin 1901a: 126, fig. 93
(misidentification); Roewer, 1934: 555-557, figs 116d, 322a
Therobates bilobatus Muma, 1951: 92-94, figs 165-173; Muma, 1966a: 28,
fig. 7; Muma, 1966c: 201, 202, 204, 205, 206, 210, 213; Muma, 1966d: 257;
Muma, 1967b: 116, 121; Punzo, 1998g: fig. 2-4d.
Eremochelis bilobatus (Muma): Muma, 1970a: 33, unnumbered fig. on p.
33; Brookhart, 1972: 33; Muma, 1974a: 8; Muma, 1974b: 388, 389, 391; Muma,
1974c: 15; Muma, 1975a: 60, 63, 64; Muma, 1976: 19; Rowland and Reddell,
1976: 9; Muma, 1979: 322-324, 326; Muma, 1980a: 132; Muma, 1980b: 269; Muma,
1982: plate 99; Muma, 1985: fig. 8; Muma, 1986: 11; Muma, 1987: 11; Muma and
Muma, 1988: 21-23, fig. 6; Muma, 1989: 28, fig. 40; Vázquez Rojas, 1995: 31;
Vázquez Rojas, 1996e: 76; Brookhart and Brantley, 2000: 445, 446; Brookhart
and Brookhart, 2006: 317.
Jeff Davis County - Davis Mountains, 2 July 1936 (J. N. Knull), 1 male (holotype).
Deposited in American Museum of Natural History. Male
and female paratypes in the Museum of Comparative Zoology, United States
National Museum, Cornell University, California Academy of Sciences,
University of Utah, and University
of Nebraska per Muma (1951).
92-94, figs 165-173 (as Therobates bilobatus):
Total length, 14.0 mm to 20.0 mm.
Chelicerae 3.5-4.8 mm
4th legs 17.0-23.0
Holotype, 18.0 mm. in length.
Coloration in alcohol light
to straw yellow, with dusky purple markings as follows: chelicerae
with one lateral and two dorsal faint dusky stripes each; eye tubercle
dark; propeltidium dusky except for a median light ovate area and
a lighter median stripe the width of the eye tubercle; mesopeltidium,
metapeltidium, and abdominal tergites faintly dusky; palpi and first
legs dusky on apical ends of femora and all of tibiae, metatarsi,
and tarsi; second, third, and fourth legs dusky on apical ends of
femora, all of tibiae, and proximal ends of metatarsi.
Malleoli white. Markings are indistinct on old alcoholic specimens and
newly molted specimens.
Dentition of chelicerae
variable but following general pattern shown in figures 165 to 167.
Movable finger with principal tooth large, two intermediate teeth, of
which the proximal is larger and the distal minute or often missing, the
anterior tooth reduced to an indistinct rounded ridge, and the mesal
tooth missing. All fondal teeth are distinct from dentate socket margin
of movable finger. Fondal notch V-shaped, with the sides incurved and
about half as wide as the base of the fixed finger. Fixed finger typical
of group; curved dorsally on basal half and abruptly narrow above on
distal half in lateral view, in dorsal view it is abruptly narrowed
mesally on distal half.
Groove of fixed finger a deep
narrow slot that widens gradually to fill the width of the finger at
about the tip of the first fondal tooth beyond which it does not extend.
Flagellum complex typical of group, with a row of dorsal simple tubular
bristles, a series of similar S-shaped plumose bristles that cover the
mesal groove, and a basal group of simple tubular bristles situated in
the fondal notch. Mesal setae of movable finger plumose except for
a few at the distal end of the articulation area.
Eye tubercle situated on the
anterior margin of propeltidium. Eyes separated by slightly more than
one diameter. Propeltidium wider than long by a ratio of 1 to 1.7.
Metatarsus and tibia of palpus
provided below with a single mesal row of long, robust spines and with
long heavy cylinder bristles below and short fine ones above. Metatarsus
of palpus without scopula and three times as long as tarsus.
First post-spiracular abdominal
sternite provided with four linear, blunt-tipped ctenidia, the middle
pair of which is frequently shorter.
Total length, 17.0 mm to 20.0 mm.
Chelicerae 4.2-5.0 mm
4th legs 16.0-18.0
Female allotype, smaller
Coloration and markings in
alcohol same as in males.
Dentition of chelicerae
variable but following general pattern shown in figures 170 and 171.
Movable finger with principal tooth large, two widely spaced
intermediate teeth, anterior tooth two-thirds as large as
principal tooth, and no mesal tooth. Fixed finger with principal and
medial teeth large, anterior tooth slightly smaller, two intermediate
teeth between principal and medial teeth, and one tooth between medial
and anterior teeth. Fondal teeth same as in male.
Structure same as in male
except the propeltidium is twice as wide as long and the first post-spiracular
abdominal sternite is provided only with trace ctenidia which are
scarcely distinguishable from the setae clothing the abdomen.
Opercula of genital segment as
shown in figure 173.
Arizona: Cochise County - Chiricahua Mountans, 18 July 1936 (J. N. Knull), 1
female (allotype) [AMNH]; Gila County - Globe, 8 July 1949 (F. Werner and W.
Nutting), 2 males; 16 July 1948
Werner and W. Nutting), 1 female; Pima County - Canada Del Oro, Santa
Catalina Mountains, 1 August 1937 (Steckler), 1 female; Tucson, 6 June
[year?] (S. H and J. L. Sperry), 1 male; Navajo County - Totem Pole, 17 July
1937 (A. M. Woodbury), 1 male. Colorado:
Montezuma County - Mesa Verde, July 23, 1941
Woodbury), one female; June 14, 1936
Woodbury), one male. New Mexico:
County - 10 miles west of Tularosa, 10 July
(Clyde P. Stroud), one male;
Army Air Base, Alamogordo, 10 June 1947
Stroud); one male; White Sands National
Monument, Otero County, July 21, 1947, one male (Clyde P. Stroud); near
White Sands National Monument, 17 July 1947
Stroud), one male;
Sierra County - Hot
Springs, Elephant Butte, 26 June 1935 (Bishopp), one female.
Texas: Brewster County - Alpine, 21 June 1949
Bradt), one female; Jeff Davis County - Fort
Davis, 14 May 1912
Mitchell), one male and one young female;
Davis Mountains, 17 June 1947 (A. T. McClay), two males and one female;
Sutton County - Sonora, 15 September 1925
Babcock), one male;
Val Verde County -
Devil's River, 5 May 1907 (Bishopp), one female.