1966] 
Barr — Alexisphodrus 
113 
flexed; sides rounded, shallowly sinuate in basal 1/5 ; basal fossae 
broad with gentle lateral slopes but with impressed line at bottom. 
Elytra 1 1/2 times as long as wide, elongate-oval; apices conspicuously 
sinuate, individually finely but distinctly truncate; striae regular 
and distinctly impressed, intervals subconvex; 3rd interval with 3 
discal punctures, anterior against 3rd stria, middle and posterior 
against 2nd stria; functional metathoracic wings present. Aedeagus 
elongate, slender, 2.25 mm (about 1/5 the total body length) in 
holotype, very similar in form to that of M. veraecrucis but smaller; 
median lobe narrowly keeled ventrally and anterior to apex; para- 
meres conchoid, right slightly smaller and apically more pointed than 
left; internal sac completely folded, bearing several dense patches 
of small scales. 
Holotype male (a unique), Sotano de Tlamaya, near village of 
Tlamaya, municipality of Xilitla, San Luis Potosi, Mexico, 30 Jan- 
uary 1966, John Fish leg. 
This species is obviously less conspicuously “spelean” in appearance 
than M. veraecrucis or the species described below. The type cave, 
Sotano de Tlamaya, is the deepest known cave in the western hemis- 
phere, with a total depth of 1354 feet. It is entered through pits at 
the south edge of the Tlamaya doline. Bell and Raines (1965) 
have recently described the cave and given an account of its ex- 
ploration. 
Mexisphodrus profundus Barr, new species 
Similar to M. veraecrucis in the small eyes, elongate pronotum, 
uniform color, and vestigial metathoracic wings, but distinguished 
by the smaller size, smaller aedeagus, the rounded elytral apices, and 
the finely transverse microsculpture of the elytral disc. Length 12.1- 
12.9 mm. Reddish-ferrugineous, shining; elytra polished-shining, the 
microsculpture finely transverse, the meshwork slightly denser than 
in M. tlamayaensis and less noticeably iridescent. Head as wide as 
long, not including the outstretched mandibles; greatest width across 
the eyes; eye diameter about 2/3 length of scape; antenna 2/3 the 
total body length. Pronotum a little more than 9/10 as long as 
wide, width of apex and width of base subequal and about 4/5 the 
maximum width, which occurs at apical 1/3; anterior angles very 
prominent; hind angles large, sharp, very slightly more than right; 
margin broadly reflexed; sides feebly rounded, sinuate at basal 1/5, 
then subparallel to the hind angles; basal fossae broad and deep. 
Elytra 1.9 times as long as wide, elongate-elliptic; apices sinuate and 
individually narrowly rounded; striae moderately impressed and reg- 
