1966] 
Murna — Solpugida 
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pair of legs; the chelicerae sometimes assisted by the palpi and first 
legs or first legs and second legs to plow excavated materials out of 
the burrow. During biting, the palpi were used as probes on the face 
of the excavation. The palpi were also used to tramp excavated 
material after it was dumped outside of or at the entrance to the 
burrow. 
Variations in substrate, burrow angle, burrowing time, biting, 
raking, plowing, probing, and tamping seem to indicate the existence 
of specific, generic, and perhaps familial behavior. 
In the family Eremobatidae, three genera and eight species were 
studied. 
Eremorhax magnus (Hancock) and E. pulcher Muma, two mor- 
phologically similar short-legged species (Muma, 1951 and 1963) 
burrowed extensively, biting, raking, and plowing vigorously. They 
differed primarily in the support of soil lifted and carried in the 
chelicerae. On the other hand, Eremorhax striatus (Putnam), a long- 
legged species with many Eremobates- like characters (Muma, 1951) 
constructed only surface nests principally by raking. 
Eremobates durangonus Roewer, E. palpisetulosus Fichter, and 
E. nodularis Muma constructed both nests and burrows, biting, 
raking, and plowing vigorously. E. durangonus and E. palpisetulosus 
burrowed at a slight angle, seldom lifting and carrying soil ; whereas, 
E. nodularis burrowed at a 45 0 to 90° angle frequently lifting and 
carrying soil. The behavioral similarity of E. durangonus and E. 
palpisetulosus and the differences exhibited by E. nodularis become 
more striking when it is noted that E. durangonus is a species of 
the pallipes- group and E. nodularis one of the pal pis etulosus-gr oup 
(Muma, 1951). It should also be noted that E. nodularis lifted and 
carried soil in the same manner as Eremorhax magnus and E. 
pulcher. 
Therobates bilobatus Muma and T. n. sp. (arcus group) bur- 
rowed slowly and laboriously, primarily biting and raking. Neither 
species used the palpi in plowing. 
In the family Ammotrechidae, three genera and three species 
were studied. 
Anunotrechula peninsulana (Banks) and Anunotrechella sti?np- 
soni (Putnam), two generically different, similar-sized species bur- 
rowed in both soil and pith or wood. Both species primarily utilized 
biting and raking in the construction of subterranean burrows. 
A. stimpsoni regularly burrowed by biting in pith or wood, A. penin- 
sulana only once. Furthermore, A. peninsulana males emerged from 
burrows during daylight hours; A. stimpsoni males did not. 
