1974] 
Coyle — Genus Aliatypus 
443 
between anterior median eyes. Chelicerae: Figs. 39-40, 45-49. Fe- 
male with row of 6 to 13 macroteeth on prolateral edge; another 
row of 2 to 7 smaller macroteeth on retrolateral side of closed fang; 
and 4 to 68 microteeth between these rows. Male also with retro- 
lateral row of cheliceral teeth. Anterior dorsal outline of chelicerae 
evenly rounded in both sexes. Female with rastellum. Pedipalps: 
Figs. 78-91, 96-120. Femur, patella, and tibia of male very elongate. 
Male tibia swollen at least ventrally near distal end. Embolus very 
long and slender. Outer (convex) edge of OCS folded over to 
cradle embolus. ICS extends to but not beyond OCS tip, and is 
intimately combined distally with OCS. Ridge runs most of length 
of ICS. Legs: Figs. 92-95. One to 4 (rarely more than 1) tricho- 
bothria dorsally near distal end of metatarsus IV. Male tibia and 
metatarsus I each with macrosetae distributed in scattered but con- 
sistent pattern ventrally over most of length. Spinnerets : Figs. 43-44. 
Three pairs (AL, PM, PL); all functional (with spigots). AL 
spinnerets 2-segmented with at least several spigots clustered at tip 
of distal segment. PM spinnerets unsegmented. PL spinnerets 3- 
segmented ; distal segment shorter than other two together. Geni- 
talia: Figs. 12 1- 1 94. Bursa copulatrix bilobed and usually very 
weakly sclerotized. Seminal receptacles paired, each pair opening 
into one lobe of bursa copulatrix. Stalks weakly sclerotized and 
usually relatively elongate and sinuous. Bulbs as sclerotized or 
slightly less sclerotized than stalks. Behavior: Burrow entrance a 
trapdoor. Egg sac pendulous and occludes burrow lumen. 
The following features of Antrodiaetus and Atypoides readily dis- 
tinguish them from Aliatypus: Thoracic groove very narrow and 
longitudinal. No row of large cheliceral teeth on retrolateral side of 
closed fang. Male pedipalp, especially patella, relatively short. ICS 
tip distinctly separated from OCS tip. Metatarsus IV with 5 to 21 
trichobothria dorsally near distal end. AL spinnerets absent or un- 
segmented with at most one spinneret apically. Burrow entrance a 
collar or turret. Egg sac attached to one side of wall and does not 
occlude burrow lumen. 
The following features of the Mecicobothriidae readily distinguish 
it from Aliatypus: Thoracic groove very narrow and longitudinal. 
No single large seta between anterior median eyes. No row of large 
cheliceral teeth on retrolateral side of closed fang. No rastellum. 
Male pedipalp, especially patella, relatively short. Metatarsus IV 
with more than 4 trichobothria dorsally near distal end. PL spin- 
nerets very elongate; distal segment as long or longer than two basal 
segments combined. Sheet web retreat without trapdoor. 
