1968] 
Coyle — Spider Genus A typoides 
163 
distal portion of embolus. Legs: Legs I and IV longer than legs II 
or III. Row of 9-26 trichobothria on dorsal surface of metatarsus 
IV of female. Abdomen: 1-3 sclerotized areas (tergites) anteriorly 
on abdominal dorsum. Spinnerets : 3 pairs. AL unsegmented and 
reduced. PM unsegmented with functional spigots distally. PL 
3-segmented with functional spigots on second and third articles. 
Seminal receptacles : 4 receptacles; distinct sclerotized stalks. 
diagnosis. A typoides may be distinguished from the genus An- 
trodiaetus by each of the following two characters : 1 ) three pairs 
of spinnerets (AL may be extremely reduced and difficult to spot 
in some specimens of A . gertschi) . 2) Male with cheliceral apophy- 
sis. The much wider outer conductor sclerite of the male palpus 
of A typoides allows separation of this genus from all known North 
American species of Antrodiaetus. 
A typoides may be distinguished from Aliatypus by each of the 
following characters : 1) AL spinnerets unsegmented. 2) Male with 
cheliceral apophysis. 3) Patella of male pedipalp not greatly elon- 
gated. 4) Thoracic groove longitudinal. 5) Burrow entrance struc- 
ture consists of a collapsible collar or a stiffened turret. 6) At 
least 8 or 9 trichobothria on the dorsal surface of metatarsus IV of 
the female. Also the structure of the male palpus in each of these 
two genera is distinct. 
discussion. A typoides is closely related to Antrodiaetus. Both 
of these genera are much less closely related to Aliatypus. One of the 
two diagnostic structures separating the former two genera ■ — AL 
spinnerets — is a degenerating character, and by itself would be a 
poor excuse for maintaining A typoides as a separate genus. On the 
other hand, the cheliceral apophysis is well developed in all A typoides 
males; it does not seem to be in the process of degenerating. How- 
ever, it is possible that in some member (or members) of an earlier 
A typoides- Antrodiaetus stock a cheliceral apophysis could have been 
quickly lost and its function of holding the female during mating 
taken over by the first legs. A consideration of the evolution of 
A typoides will await the revision and similar consideration of the 
other antrodiaetid genera. At present it seems desirable to maintain 
the generic status of A typoides, since it can be rather easily char- 
acterized and distinguished from Antrodiaetus. 
Incorrect placement. A typoides calif ornica Banks = Aliatypus 
calif ornicus (Banks). Banks (1896) described this species from an 
immature male specimen collected at Black Mountain, Santa Clara 
Co., California.. Smith (1908) discovered the adult male of this 
