C. H. TYLER TOWNSEND — BIOGEOGRAPHY OF MEXICO, ETC. 59 
species as occurs on the plains. Professor Cockerell wrote me later con- 
cerning it, as follows: “To my surprise, the species you found on the 
White Sands with the Perdita townsendi proves to he quite distinct and 
new. Probably confined to the White Sands, like the Perdita. I have 
called it Colletes gypsicolens. The fauna of the White Sands must he 
very peculiar. At any rate, both the bees you collected are new, and I 
feel quite sure do not occur elsewhere. Probably there are a dozen bees 
peculiar to the sands, not to speak of other things.” 
Flora and Diptera. — The following plants were collected at the 
White Sands, or near that district, and are determined! by Professor 
Woo ton unless otherwise noted. Of the diptera taken on their flowers, 
the few that have already been determined by the writer are included: 
1. Oenothera 2 spp. — Two species of this genus collected by Professor 
Cockerell on the edge of the White Sands are pronounced by Miss East- 
wood to he new varieties. 
2. Bigelovia graveolens Cray var. appendiculata Eastwood (n. var.). — 
This has been described by Miss Alice Eastwood as a new variety. On 
the White Sands, over the edge from Whitewater Holes, October 6. Some 
interesting diptera, to he determined later, were taken on the flowers of 
this Bigelovia. Also Perdita townsendi Ckll. and Colletes gypsicolens 
Ckll., as above mentioned. 
3. Bigelovia pulchella Cray. — White Sands, over the edge from White- 
water Holes, October 6. 
4. Aster parviflorus Cray. — Whitewater Holes, at edge of White 
Sands, October 6. About 4000 feet. On its flowers were: 
1. Paragus bicolor var. testaceus Meig. 
2. Paragus tibialis var. dimidiatus Lw. 
3. Melanostoma stegnum Say. 
4. Zodion fulvifrons var. ah dominate Say. 
5. Lcucomelina garrula Cig.-Tos. (coll. Ckll., det. Dept. Agri- 
culture). 
The following bees were also taken on its flowers: 
Perdita townsendi Ckll. 
Perdita fallax Ckll. 
Perdita townsendi Ckll. 
5. Aster canescens Pursh. — Eoad near White Sands, September 30. 
6. Sartwellia flaveriae Cray. : — Road near White Sands, September 30. 
7. Statice limonium Linn. var. californica Cray. — First arroyo south 
of Tularosa, October 5. This is said by Professor Wooton to he probably 
a very good species, instead of a variety. 
As hearing on the San Augustine or Tularosa plains fauna, it should 
he mentioned that a new form of Ceroplastes irregularis Ckll. was found 
