455 
The insect is common in Europe and attacks the European 
elms, but much less seldom our native U/mus Americana. Whether 
there is any remarkable significance in the close resemblance of 
the insect larvae to the fruit of certain lichens common to the elm 
Iam not able to say. The close resemblance nevertheless sug- 
gests mimicry. 
MASSACHUSETTS AGRICULTURAL COLLEGE, 
id 
Two Nuttallian Species of Oxalis. 
By Joun K. SMALL. 
? 
a 
In the earlier part of this century Mr. Nuttall collected two 
Species of Oxalis on the Pacific slope; the one he secuted in 
Oregon, the other in California. The collector sent descriptions 
of his two new species to Torrey and Gray while they were pub- 
lishing their Flora of North America. The descriptions were ac- 
companied by specimens which are now preserved in the Her- 
barium of Columbia University. 
Torrey and Gray reduced both the species to Oxalis corniculata* 
and printed Mr. Nuttall’s descriptions in a foot-note and thus the 
two plants for many years, and one to the present time, remained 
without further recognition. 
The first of the two species described was O-xalis pumila.t It 
Was said to occur in “Forests of the Rocky Mountains and Ore- 
gon.” The original specimen I have to refer to is from Oregon, 
and consists of two plants, the one in flower the other in fruit. 
This form was later described by Professor Trelease as Oxalis Suks- 
dorfii,t which name may stand on account of the earlier described 
Oxalis pumila,§ of D’Urville. The ample supply of Oxales Suks- 
? which we now have from Oregon, agrees in all details with 
Mr. Nuttall’s original specimens of Oxalis pumila. In addition to 
ur material from Oregon, I find two specimens from California ; 
they were collected many years ago and sent to Dr. Torrey. The 
*FLN. Ay: 212, 
+ T. and G, Fl. N. A. r: 212, 
¢ Mem. Bost. Soc. Nat. Hist. 4: 89. 
§ Mem. Soc. Linn. Par. 4: 616. 1826. 
