88 NATURAL RESOURCES SURVEY 



able in color and the variations have a very definite relation 

 to that of the ground around them, being very light on sandy 

 soil, mottled on pebbly hills and darker among the pines 

 where there is more vegetation. The first adults were seen 

 on April 21st., this year and they are often quite numerous in 

 early December. 



Migrations. During the several evenings in early Sept- 

 ember of this year the city of Albuquerque was invaded by 

 large numbers of this locust. The same phenomenon has 

 been noticed to a less extent during each of the four autumns 

 that I spent in this region. The cause of this movement 

 from the "mesa" into the valleys is this. If the summer 

 rains start in early in July or, as this year, in late June the 

 : grass and herbs on the mesa make an early and vigorous 

 growth to which the locusts quickly respond by rapid in- 

 crease in numbers. When the rains cease these grasses 

 quickly mature and dry, making most excellent hay in situ. 

 This, although very good feed for herbivorous mammals, is 

 apparently useless to the locusts, which migrate to the de- 

 pressions of the mesa and then, as these also dry, out to the 

 valleys. Whenever there occurs an early and brief rainy 

 season the farmers of the valleys may expect, about four to 

 six weeks after its close, a visit in force from these mesa 

 insects. 



COLEOPTERA 



* Anepsius delicatulus, Lee. 



Asida convexicollis. Also Cedar Assn. Estancia Valley. 



A. elata. 



A. marginata. One seen eating a dead Eleodes. 



A. marginata, var. rimata. Only near base of Sandia Mts. 



A. sordida. 



Tylosis maculatus, Lee. 



Cantharis deserticola. Previously reported only from 

 Walnut Creek, Grant Co. 



Canthon ebenus, Say. 



Paria sellatus. 



Cicindela pulchra. Larvae found by Dr. Shelford in hard 

 barren adobe on the edge of the mesa on the border of the 

 Ohrysothemnus Assn. It is more common on the more 

 grassy mesa towards the Rio Puerco (July 1911.) Larvae 



