18709. | Mold as an Insect Destroyer. 681 
Cnicus edulus Nutt.(?). A single plant collected near Veta 
Pass; whilst agreeing tolerably well with the description of this 
species, the specimen is not in a condition to be satisfactorily de- 
termined. T. Meehan, who collected it, says he has not seen 
this plant from Colorado before. 
Troximon glaucum. On the roadside between Bellevue moun- 
tain and Central City ; quite scarce. 
Phacelia glandulosa Nutt. Southern Colorado. 
Physalis hederefolia Gray (?). On the plains before reaching 
Denver; plant prostrate and very viscid, leaves small and short 
petioled. 
Mimulus floribundus Dougl. The specimens collected at Boul- 
der Falls have all the pedicels shorter than the leaves. 
Herpestis rotundifolia Pursh. Collected at Cahokia, Illinois; 
with the leaves having punctate dots. 
Salix flavescens Nutt. (?) On the trail to Pike’s Peak through 
Engelmann’s Cañon. M. S. Bebb says: “It has been frequently 
collected and is most likely allied to S. flavescens Nutt. of the 
Pacific coast, somewhat as S. Fendleriana is allied to S. /asiandra, 
that is, it may prove a hybrid between that and S. discolor.” 
Populus monilifera Aiton. On the low lands near Pueblo. 
Abies concolor Lindley and Funiperus occidentalis Hook. In 
Engelmann’s Cañon and Queens Cañon. 
Smilax herbacea Linn. Plant more robust than the eastern 
form, leaves larger, more rounded ; one specimen, only, collected 
in Glen Eyrie, with no evidence of the odor that usually accom- 
panies the plant. 
Lycurus phleoides H. & B. Collected in the Garden of the Gods, 
probably introduced from Mexico by traveling teamsters. 
Muhlenbergia glomerata Trin. A form of this species near 
Manitou, not common. | 
——.0; 
MOLD AS AN INSECT DESTROYER. 
BY C. G. SIEWERS. 
T perplexing problem: How shall we check the excessive 
increase of noxious insects that imperil our crops ? has been 
put in a fair way of solution by the researches of Dr. Bain, a 
Prussian savant, as recorded by Dr. Hagen, of Cambridge, Mass., 
in the June number of the Canadian Entomologist. 
