142 Journal New York Entomological Society. [Vol. xxv. 



The Curator announced the final meeting of Coleopterists for the season 

 on Saturday, April 7, at 2 P. M., subject Coccinellidse. 



Mr. Olsen showed report in daily press of Mr. E. B. Williamson's return 

 from Columbia, S. A., with an account of his journey. 



Dr. Lutz exhibited about 16,000 insects collected in Arizona and with 

 maps and photographs illustrated his account of the journey made by ^Ir. 

 J. A. G. Rehn and himself in 19 16. He said in part that starting from New 

 York, June 24, the first collecting of interest resulted from the train being 

 stalled in a swamp in Texas about 9 P. M., so that many insects were attracted 

 to the lights at the rear. Tucson was reached July 3 and the Santa Catalina 

 Mts, were visited first with excellent results at the Lowell Ranger Station in 

 spite of a temperature of 106°. On July 8 a trip was made to Mt. Lemon 

 and later the ascent to Bear Wallow at 8,200 ft. was completed. The contrast 

 between the temperature and vegetation at these stations was strongly 

 marked, for the cold and the damp at the greater height caused suffering 

 and, when the clouds obscured the sun, permitted of picking Xylocopa off the 

 flowers by hand, while the vegetation changed from cactus through oak 

 to pine. 



The following approximate elevations for different regions was shown on 

 the blackboard : 



Desert slopes with mesquite and opuntia 2,200-2,500 ft. 



Desert slopes with palo verde and giant cactus... 3,500 ft. 



Desert slopes with yucca and agave 4,500 ft. 



Canons with oak occur at 3,500 feet and beyond that elevation the oaks begin 

 to appear also outside the canons, finally becoming abundant and mixed with 

 trees like our eastern ones, Pinon, Prunus, Robinia, Rhus, Solaniim, etc., at 

 4,000 to 6,000 feet ; pines begin to appear next and become abundant at 6,500 

 feet ; forests of fir occur at 8,500 feet. These figures would, however, vary 

 on the different slopes and are only intended as an approximation. 



The night work at the most elevated stations was unsatisfactory, but 

 elsewhere the results of using a tent of cheesecloth about 9 feet long by 6 

 feet wide and 6 feet high, with a muslin floor provided with shelter strips of 

 cheesecloth, were glorious. Both ends were commonly left open and two 

 lanterns hung within. The outside worked like a sheet and attracted many 

 insects, while others took shelter within or on the floor. Rains were frequent 

 and flowers were abundant in the encinal or oak region from 4,000 to 6,000 

 feet elevation and particularly at Mud Springs good collections were made. 



The object of the trip being largely to compare the encinal regions of 

 isolated mountain ranges in southwest Arizona, a wagon trip, with Frank Cole 

 for guide, was started July 24, on information as to the vegetation obtained 

 from the Desert Laboratory. Sonoita, Black Dike, Prospect, Kitts Peak, 

 Coyote Mts., and other localities in the Baboquivari range were visited in the 

 following three weeks. The results were not equal to expectations owing to 

 the stands of oak and pine being of insufficient extent, the oak associations 



