VOL. IL. ] fnsects on Yucca Blooms. 113) 
bloom; /ongifolia was just getting beyond its prime. Gila spicata 
was not found on thistrip, although it was in bloom near by. 
Phacelia circinata, Franklinit, sericea and Menziesti were all in 
bloom though not all found by our party on that excursion. — 
Echinospermum floribundum and Redowskii were in bloom, while 
Omphalodes Howardi was in fruit. Krynitskia glomerata was in 
fine condition. JMertensia oblongifolia had passed into fruit, but 
Stbivica was in prime condition. Lithospermum pilosum and an- 
gustifolium had gone to fruit. Collinsia parviflora was past its 
prime. The Pentstemons in bloom were acuminalus, cristatus, con- 
fertus var. ceruleo-purpureus, and one as yet unidentified. Syz- 
thyris rubra had gone to seed. Castilleia mineataand pallida were 
sparingly found. antago eriopeda was plentiful on the plains. 
Eriogonum umbellatum was just coming into bloom, and Skepherdia — 
Canadensis going out of bloom. Betula occidentalis, Alnus viridis, 
Salix longifolia, flavescens, rostrata and Populus tremuloides lined 
the brook sides. 
Cypripedium parviflorum, Iris Missourtensis, Sisyrinchium mu- 
cronatum, Camassia esculenta, Smilacina amplexicaulis and stellata, 
Fritillaria atropurpurea, Erythronium grandiflorum var. minor, 
Streplopus amplexifolius, Prosartes trachycarpa, Zygadenus elegans 
were the liliaceous flowers in bloom. Leucocrinum montanum and 
Fritillavia pudica had long disappeared. 
Of Conifers we met Juniper communis, Pseudotsuga ‘Douglasiz, 
Pinus flexilis var. albicaulis, Pinus ponderosa var. scopulorum, and 
Pinus contorta var. Murrayana. 
INSECTS FREQUENTING YUCCA BLOOMS. 
BY C. H. TYLER TOWNSEND. 
Any obsevations, however imperfect, relating to insects found fre- 
quenting the flowers of the various species of Yucca, are of much 
_ interest and value, in view of the attention which is being giver: to 
this subject by Dr. Riley, Prof. Trelease, and others. 
It is believed by many persons now, since Dr. Riley first advanced 
the idea some years ago, that certain species of Pronuba, a genus of — Be 
of small moths, are more or less indispensable to the fertilization of — 
the Yucca flowers. Moreover, the benefit between the moth and > 
the plant is believed to be mutual, inasmuch as the moth deposits 
