444 
Psyche 
[September-December 
Discussion. As I have said earlier in this paper and before (Coyle, 
I 97 I ), Aliatypus may be as closely related to the Mecicobothriidae 
as to the other antrodiaetid genera, Antrodiaetus and Atypoides. 
However, it is best to retain Aliatypus within the family Antrodiaeti- 
dae until a careful comparative study of all atypoid mygalomorph 
taxa demonstrates otherwise. 
As discussed earlier, A. calif or nicus , A. ]anus, A. isolatus, A. aqui- 
lonius, and A. gnomus form a group of closely related species, A. 
trophonius , A. erehus, A. plutonis, and A. torridus form another 
group of closely related species, and A. gulosus is quite distinct from 
all other Aliatypus species. I will not formally designate species 
groups, however, because the placement of A. thompsoni, which ap- 
pears to be intermediate in its relationship to the two groups of spe- 
cies, would be rather arbitrary. 
Key to Species of Aliatypus 
Males 
1. Palpus unique (Fig. no); sperm reservoir looped very loosely, 
and embolus base close to ICS base. Pedipapal tibia (Fig. 85) 
banana shaped and elongate; PTX/PTL = 0.37-0.45 
gulosus 
Palpus otherwise (Figs. 96-109, m-120); sperm reservoir 
much more tightly coiled, and embolus base distant from 
ICS base. Pedipalpal tibia (Figs. 78-84, 86-91) not banana 
shaped; PTX/PTL = 0.64-0.82. 2 
2. PSL/PSS = 1.28-2.38. CL/IML = 1.02-1.24. Tibia and 
metatarsus I (Fig. 93) with short ensiform macrosetae and 
strongly appressed background setae. Thoracic groove nearly 
always absent or shallow. thompsoni 
PSL/PSS = 0.14-1.17. CL/IML = 1.37-2.07. Tibia and 
metatarsus I (Figs. 92, 94-95) with more elongate macrosetae 
and suberect or erect background setae. Thoracic groove a 
deep pit. 3 
3. Weakly sclerotized, finger-like extension at tip of conductor 
(Fig. 106). PTL/PPL = 1.03-1.06 and CL/PSS = 4.80- 
5.3 1 . aquilonius 
No such extension at tip of conductor (Figs. 96-105, 1 07-1 20). 
PTL/PPL = 1.10-1.46 or CL/PSS = 5.50-10.34. 4 
4. ICS forms at least a weak keel distally (Figs. 96-101) 5 
Conductor either without a keel (Figs. 102-113, 119-120), or, 
if keel present, then it is an extension of the OCS and is 
closer to the conductor tip (Figs. 114-118). 6 
