CONTRIBUTIONS TO WESTERN BOTANY 107 
clouds, There is an Acacia here with white flowers and hooked 
spines that is very annoying and at all elevations, rarely 10 ft. 
high, but have seen little fruit of it, The persimmon isa shrub 
about 15 ft. high, but have seen little fruit of it, also got it at 
Primiera Agua and could not tell what it was till I got the fruit. 
There is a wasp here with nest hanging down horizontally like an 
inverted plate, 4 inches wide, others tongue-like hang from twig 
ends and cliffs, The wasp is narrow and yellow and rests on the 
water like a skipper and does not wet its feet, and flies from it 
easily, have seen hundreds of the neste. There are other wasps 
that make nests on tree trunks like a dirt covering, and 1-3 ft. 
the merest excuse for a home. Will not rain tonight. We are 
on our way back and I am not satisfied with what I got because 
of the dryness, but it will be drier on the western side. There 
are many more flac Opuntias here with yellow spines and big joints 
Asclepias subulata occurs also. Ina gulch gota beautiful mint 
6 ft. high, with many slender stems gray and erect among loose 
rocks at the bottom. Also found a small tree 10 ft. high, Prunus 
ilicifclia without fruit. There is a beautiful amphitheater here « 
mile wide with precipitous face near the top, 500 ft or more high 
and with many liveoaks along the upper slopes and in draws be- 
low cliffs, Strata horizontal but all eruptive in layers 2000 ft. 
thick. Saw 3 people today, on their way to Comondnu. Palmer 
figs very tall. Saw a puddingstone boulder 30 ft. high overbang- 
ing a gulch. Am getting over being sore from riding. | 
Oct. 26 Arroyo Undo, 7.30 a, m. Just began to rain gently, 
sky all overcast by a thin cloud, sun coming up in the east; they 
say it may rain all day. The owner of the ranch came down from 
the waterhole above which he reached yesterday noon and stayed 
all night with us, another man came just after it began to rain 
and so there are 4 of us now under the meager shelter. Got all 
our stuff out of the rain. Mules are tied to the brush on the wa- 
ter trail, Bar. 2100 ft. and indicates little rain, humidity satu- 
