114 PROCEEDINGS OF THE ACADEMY OF [Feb., 



grasses at the junction of two of the glades, and another specimen was 

 taken on a steep hillside in open conifer forest. In the latter situa- 

 tion Acrydium crassum was also taken. Search in many pine and fir 

 logs disclosed only a few Ceuthophilus, valgus and uniformis being taken. 



The nights were very chilly and no katydids were heard. The 

 effect of the cool evenings was apparent in the scarcity of Melanoplus 

 calidus and Gomphocerus clavatus before ten in the mornings, both 

 species occurring in numbers in the afternoon. 



Aden, Donna Ana County, New Mexico. Altitude, 4,382 to 5,000 

 feet. July 21, 1907. 



The plain about this station differs from the greater part of the 

 southern New Mexican desert plains in that it is covered in most 

 places by low grasses, giving it some slight resemblance to the Great 

 Plains. Over this plain small mesquite bushes are scattered at greater 

 distances than usual. Near the railroad track the grasses grow in 

 great profusion, reaching in many places a height of nearly a foot. 

 In this location Orthoptera were found in very great numbers, among 

 the series taken being several plains species not found on the surround- 

 ing deserts. 



About a quarter of a mile from the station a rounded hill rises directly 

 from the prairie. This hill is very rocky and covered by a scattered 

 growth of grease wood (Covillea tridentata), and in spite of its elevation 

 of not more than 600 feet above the surrounding plain several 

 mountain-loving species, such as Eritettix variabilis and Arphia teporata, 

 were found on it. It is interesting to note that such forms of Orthop- 

 tera were to be found on this solitary little knob, in spite of its small 

 size, low altitude and the fact that it is several miles distant from 

 the nearest hills. 



Deming, Luna County, New Mexico. Altitude about 4,350 feet. 

 July 18-21, 1907. 



About the town of Deming stretches a typical desert plain, covered 

 with groves of medium-sized mesquite (Prosopis velutina) and large 

 areas of rabbit-weed (Isocoma heterophylla) , broken on the north by 

 the bed of the Mimbres River. On both sides of this stream-bed are 

 extensive flats of white sand closely dotted with tall yuccas. These 

 flats average about half a mile to a mile in width and are hard to 

 cross, owing to the loose and yielding sand. No low vegetation is 

 present on these areas, and but two species of Orthoptera, Tri- 

 merotropis texana and laticincta, were taken in the section. On the 

 north side of the sand and yucca belt, in extensive rabbit-weed tracts, 

 collecting was very productive, Hesperotettix viridis being found in 



