260 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
of herbarium specimens and selecting exhibition specimens of cacti, 
which were shipped to the New York Botanical Garden. From Te- 
huacan side trips were made along the tramway toward Esperanza and 
to Oaxaca city, and from the latter point Mitla was visited, where two 
days were spent in and about Tomellin Cafon. <A short trip was 
made to Vera Cruz and also to Leon, after which I closed up my field 
work and returned to Washington. 
The herbarium material collected contains more than 500 numbers 
(11001-11534), a full set of which has been mounted for the National 
Herbarium. . 
In addition to the herbarium material 236 specimens of seeds, bulbs, 
and succulents (chiefly cacti) were collected and sent to Washington. 
At the same time a nearly full set of the cacti was selected and 
shipped to the New York Botanical Garden. Many of these latter 
specimens were of immense size and form striking exhibition objects. 
The following table will show in detail the places visited, the date 
of each visit, and the number of miles traveled in course of this trip: 
ITINERARY. 
1906, Miles. 
Aug. 10. City of Mexico to Tlalpam, Distrito Federal and return. ........-- 15 
13. City of Mexico to Cuernavaca, by rail.......2.2..2----2--------- 74 
14. Cuernavaca to pedregal and return .......-....------------------ 16 
15, Cuernavaca to City of Mexico and return, by rail......-.---.----- v4 
17. City of Mexico to El Parque and return, by rail......-.-.-------- 114 
20. City of Mexico to Querétaro, by rail......------.----.-----.------- 153 
24. Querétaro to City of Mexico, by rail...-.......------------------ 153 
31. City of Mexico to Tehuacéin, by rail.........2-.--.--------.----- 208 
Sept. 1. El Riego to hills east of Tehuacdin and return...-.......--------- 10 
3. Tehuacin to Oaxaca City, by rail......22....222-------2--------- 148 
5,6. Oaxaca city to Mitla and return, by stage -.........2-2..--.------ 70 
7. Oaxaca city to Santa Catalina, by train ........-.2.2--.----..---- 45 
7. Santa Catalina to Tomellin station........--.------. .------------ 22 
8. Tomellin to Tehuacdn, by rail.....-...--2-2-------------------- $1 
14. Tehuacan toward Esperanza and return, by tramway.........-.-- 30 
17. Tehuacan to Esperanza, by tramway.........---.-.------------- 31 
17. Esperanza to Orizaba, by rail...........2.--.-------------------- 30 
18. Orizaba to Vera Cruz, by rail.......-..-----.-------------------- 30 
20. Vera Cruz to City of Mexico, by rail......2.-.2.------------ _.-- Al 
23. City of Mexico to Pachuca, Hidalgo, by rail..-..-.-..------------ 61 
24. Pachuca to Sierra de Pachuca and return........-.-.------------- 10 
24. Pachuea to City of Mexico.............--..--------------------- 61 
26. City of Mexico to Xochimilco and return............------------ 15 
28. City of Mexico to Leon Guanajuato, by rail......-2...2.222------ 259 
29. Leon to San Luis Potosf, by rail.....---.-.-----.---------------- 244 
CYCADACEAE 
A NEW SPECIES OF DIOON. 
Dioon purpusii Rose, sp. noy. 
Trunk short, crowned by numerous leaves, these often a meter or more long, stiff 
and ascending; petioles somewhat 4-angled; pinnie 5 to 9 cm. long, stiff, pungent, 
towards the base, 1 to 1.5 cm. apart, above closely set, entire on the lower margin, 
