28 Proceedings of the Biological Socieig of Washi/ngton. 
transversely elongated, dirty, brown areoles, 4 nun. apart; fruit small, 
snbglobose, red. 
In some respects the species stands midway between the genera Nopalea 
and Opuntia. Occasionally the jnstil is actually longer than the petals. 
The type is ))reserved under my inventory No. 1)751, and was collected in 
the State of Oaxaca, Mexico. 
Opuntia confusa sp. nov. 
“ Still later, while the jaige ])roof of this i)aper was in hand. Dr. 
Oritiiths’s publication of 0. arizoiiica was received, which jtroved to he 
an antici[)ation of another of my sj^ecit^s. I actiordingly here substitute 
Dr. Oriliitlis’s name, allowing, however, my description to stand as 
already in tyi)e.” —Contr. U. S. Nat. Derh., IS: 402. 1009. 
The facts api)ear to he as follows: 
(1) Opuntia arizonica Grillitlis is from the highlands of northern 
Arizona, and has never been collected in the southern ])art of the State. 
(2) The plant, referred to l)y Doctor Rose grows near Tucson, and so 
far as known, does not occur (tn the San Francisco Highland. 
(o) There is little in common between the two .si)ecies except the mere 
arrangement of the spines. 
(4) It is an error to refer this Tumamoc Hill .si)ecies to Opuntia 
arizonica. 
(5) To this Tumamoc Hill species, I api)ly the above name, the type 
of which is my inventoi’y No. 10,441, and reier to the description associ¬ 
ated with the above reference. Several emendations, however, are neces¬ 
sary. The flowers are only 5 to 8 cm. in diameter. The sjucules are not 
“caducous except on margins of joints.” It is true that they are all ea.sily 
sei)aral)le, hut more so on the edges than on the sides of the joints. The 
fact is that th(^ spicules on the edges and sides of joints are radically 
dift'enmt. In the latter situation, they are short and more closely aggre¬ 
gated, while in the former they measure a centimeter in length, are more 
scatten'd through the areole, and more easily separable. This is a 
characteristic of a very large group of southwestern species, if indeed it 
may not l)e said to he common enough in the Hat-jointed species to he 
considered a group characteristic. The fruit is short-pyriform to suh- 
glohose, red, with abundant bloom which is largely lost at complete 
maturity, when the color becomes dark dull red. The color of the S])ines 
can not he called ” bright red,” hut dark-red to reddish-hrowu. 
