270 THE CACTACEAE. 
Figure 242 is from a photograph taken by Mr. Collins in 1902; it is three-fourths 
natural size. 
On page 58, vol. 1, under Cephalocereus hermentianus, add: Illustration: Mollers 
Deutsche Girt. Zeit. 25: 473. f. 5, No. 10, as Prlocereus hermentianus. 
On page 58, vol. 1, under Pilocereus albisetosus, add the synonyms: Cactus albisetosus 
Sprengel, Syst. 2: 496. 1825; Cactus albisetus Steudel, Nom. ed. 2. 1: 245. 1840. 
On page 61, vol. II, under Espostoa lanata, add to illustrations: Schelle, Handb. 
Kakteenk. 105. f. 41, as Pilocereus lanatus; Schelle, Handb. Kakteenk. 105. f. 42, as 
P. lanatus cristatus; Wiener Ill. Gart. Zeit. 11: pl. 3, in part, as P. dautwitzit. 
On page 64, vol. 11, under Stetsonia coryne, insert: W. B. Alexander wrote, under date 
of March 7, 1921, as follows: 
“Noticing your statement that the fruit of Stetsonia coryne is unknown, I obtained a ripe specimen 
at La Rioja for you and am sending it by parcel post.”’ 
This we describe as follows: 
Oblong, 6 cm. long, glabrous, bearing scattered scales, these 5 mm. broad, 1 mm. high, each 
with a cartaceous tip and a denticulate margin; seeds numerous, small, 1.5 mm. long, flattened, 
pitted; hilum large, basal. 
On page 65, vol. 1, under Stetsonia coryne, add to illustrations: Thomas, Zimmerkultur 
Kakteen 11, as Cereus coryne. 
On page 66, vol. 11, under Escontria 
chiotilla, add to illustrations: Mollers 
Deutsche Gart. Zeit. 29: 438. f. 13; 
Floralia 42: 389, as Cereus chiotilla. 
On page 69, vol. u, under Pachy- 
cereus pringlei, insert: The distribution 
of Pachycereus pringlei in northern So- 
nora is not well defined. Dr. MacDougal 
has recently visited northwestern Sonora 
and states that he saw it along the route 
between Altar and Port Libertad to 
within a hundred miles of the United 
States boundary. Prospectors and 
ranchers also speak of it as being abun- 
dant in the valley of the Asuncion or 
Altar River some miles to the north- 
ward. He writes of it as follows: 
‘On the whole, however, my chief inter- 
est was centered on the sowesa or Pachycereus 
pringlei. We began to get into this about 85 
miles from the Gulf, and in the region below 
a thousand feet it attains perfectly tremend- 
ous size, as you will see from some photo- 
graphic prints.” 
Figure 243 is from a photograph Fic. 242.—Cephalocereus collinsii. 
obtained by Dr. MacDougal at Port Libertad, Sonora, May 4, 1923. 
