238 BOTANY. 



too young, and in doubt placed here (126, 112), were much frequented by 



a large black insect an inch or more long. Attached to these were some 

 flies engaged in Bucking the juices of the larger insect* We found many 

 of the flies still active and adhering to their defunct victims. — Southern 

 Arizona (555,556); Nevada. 



Eurotia lanata, Moq. — Common throughout the West, where it goes 

 among the herdsmen under the name of White Sage and Winter- fat, — a 

 really valuable forage eagerly eaten by stock. 



Corispermum hyssopifolium, L. — Colorado (37, 866, 872). 



Spirostachys occidentalis, Watson (Ilalostachys occidentalis, Watson 

 in King's Report, v, 293). — Nevada, Arizona, and Utah. 



PARONYCHIE.E. 



Paronychia pulvinata, Gray. — South Park, Colorado, at 12-13,000 

 feet elevation (46). 



EL.EAGNE2E. 



Shepherdia Canadensis, Nutt. — Colorado (58, 59). 

 El2Eagnus argentea, Pursh. — Colorado (60). 



URTICE.E. 



Celtis reticulata, Torr. (Ann. N. Y. L} t c 2, 247, and Nutt. Sylva, 

 1, 133, t. 39). — Leaves somewhat acute, obliquely cordate-ovate, and the 

 nearly entire margins somewhat revolute ; veins strongly reticulated on the 

 lower surface and deeply impressed on the upper, papillose-scabrous above, 

 less rough below ; fruiting pedicels longer than the petioles ; the pisiform 

 berry glaucous, with a somewhat reticulate-rugose nucleus. — Nevada. Not 

 having seen a specimen, I have drawn this description largely from 

 Planchon, in DC. Prod. 17, p. 178. 



Number 367, from Camp Grant, Arizona, Mr. Watson regard-; as a new 

 species, for which he has indicated the name of C. curtipes. 1 do not feel 

 like attempting a description from the material at hand. It is a tree 20 

 feet high, with a diameter of 18 inches, and has a smoothish, white bark. 



Urtica gracilis, Ait., San Luis Valley, Colorado (71), and U. gracilis, 



•Since Ibis observation was made in l-Tl the relations existing between insects and flowering 

 plants bave come to be more generally acknowledged, because more fully nnderetood 1 oowsnapeet 



that the case given above lias a deeper history than appears on the surface. 



