1966] 
M uma — Solpugida 
257 
and fourth or fourth legs outside of the burrow while biting and 
raking. The palpi were also used regularly in tamping. 
Eremobates palpisetulosus Fichter. — Burrow depths of 2.5 to 5.1 
cm have been recorded for males, 7.6 to 10.2 cm for females. Males 
and females were collected from burrows and surface nests under 
cow pies and rocks. Burrows were constructed at an angle of 30° or 
less to the surface of the soil. Burrow construction time was not 
obtained ; one male took 60 minutes to burrow out of sight. 
In the laboratory, males and females constructed both nests and 
burrows. Chewing, raking, and plowing were all utilized. Varia- 
tions were about the same as those of E. durangonus. 
A male in a surface nest under a small cow chip burrowed to a 
depth of 3.8 cm in 2 hours when heat was reflected onto the surface 
of the substrate. Twelve hours after heat was removed, the speci- 
men had again constructed a surface nest under cow chip. 
Therobates bilobatus Muma. — Two males and one female of this 
species have been collected from surface nests beneath cow pies. One 
male was taken from a nest in a cow pie. Burrow angle and burrow- 
ing time were not observed. 
In the laboratory, males and females constructed both burrows and 
surface nests. Laboratory-constructed burrows were angled at about 
40° to the substrate surface and were laboriously constructed. Biting, 
raking, and plowing were all utilized but plowing was minimal. 
The palpi were not used by the males in plowing; the first and second 
legs seemed to hold the load. 
Therobates n. sp. ( arcus group). — A single male of this new 
species was collected at a night light. In the laboratory, he 
constructed a burrow 3.8 cm deep at the base of a twig pushed 
into the substrate. The angle of the burrow with the substrate 
surface was not calculated owing to its spiral nature around the 
twig. The burrow was closed in 95 minutes. 
Biting, raking, and plowing were all utilized. The palpi and 
first legs swept the loosened soil back to the second legs for raking. 
Raking was not as vigorous as that exhibited by species of Eremo- 
bates. During plowing, the load was encircled by the first and second 
legs; the palpi were held aloft. Probing and tamping were not 
recorded. 
Ammotrechula peninsulana (Banks). — Burrow depths of 5.1 to 
7.6 cm were recorded for females. Females and immatures were col- 
lected from burrows and surface nests. Burrows were constructed 
at a slight angle, 20° or less, to the soil surface. 
In the laboratory, males, females, and young all constructed bur- 
