1905.] NATURAL SCIENCES OF PHILADELPHIA. 229 
“Like rhyssa in size and form, but umbilicus wider, exposing the 
penultimate whorl; sculpture finer, consisting of strie rather than 
riblets. One specimen, diam. max. 15, min. 123, alt. 9 mm.” 
Lower slopes of Sierra Blanca, New Mexico, above head of Ruidoso 
ereek, in aspen belt, about 9,500 feet altitude. (Prof. C. H. T. Town- 
send, August 14, 1898.) 
The original description is given above. The unique type specimen 
was lost. Prof. Cockerell subsequently described what seems to be the 
same race, or one excessively similar, as A. hyporhyssa edentata, with 
mutations rujescens and alba, from Cloudcroft, Sacramento Mountains. 
In the absence of any differential feature in the description or measure- 
50% 
45% 
40% 
35% 
30% 
25% 
20% 
15% 
10% 
5% 
PSy lato 145 W425 5) 1525) 16 G.S) Lamm: 
1 6 41 36 =686 13 10 5 2 variates 
ments, I assume that the Cloudcroft shells are identical with 
hyporhyssa. 
A somewhat large series was collected by Mr. H. L. Viereck in James 
Canyon, at Cloudcroft, Sacramento Mountains, at an elevation of 9,500 
fect. Two lots were taken, one of a few large specimens (Pl. XII, 
figs. 7, 8), the other of many smaller ones. Compared with A. rhyssa 
the shells differ in the constantly more depressed last whorl, though the 
spire may be equally high; the umbilicus is wider at its opening, ex- 
posing more of the penultimate whorl; the basal tooth is obsolete or 
very weak, and the parietal tooth is present only as an extremely 
small vestige in less than 5 per cent. of the specimens. Finally, the 
