ZOOLOGY 107 



MUD FLATS OF RIO GRANDE. 

 ORTHOPTERA. 



Dissosteiria carolininiana. Scudd. This "Road Duster" 

 which in the East is to be found in the driest of situations 

 with us clings very closely to the moist valleys. It is com- 

 mon here and in the meadows along the mountain streams 

 but is very rare on the mesa and scarcely less so over the 

 Sandias generally. This is by no means an isolated case but 

 on the other hand illustrates a general tendency of eastern 

 forms that occur here. Dr. V. E. Shelford noted the tendency 

 among tiger beetles. The explanation is that the situations 

 is nearer the water here have about the same degre of humi- 

 dity as the drier places in the more moist east. 



Tettix Several as yet undetermined species occur here in 

 considerable abundance. 



COLEOPTERA. 



Bembidium corax, Lee. 

 B. coxendix, Say. 

 B. dolosus 

 B. incurvus 

 B. nubilosum 



B. versicolor. 



Cicindela hirticollis, Say This one breeds nearer the 

 river than any of the other Tiger-beetles. Its larvae are 

 common in the higher parts of these mud banks. 



C. repanda, Dej. comes next. Its larvae are found along 

 the banks of the river which mark the limit of the usual high 

 water, the burrows of the preceeding species being cov- 

 ered at these times. 



Ha^tica obliterata, Horn. Abundant here and as high up 

 as Espanola, especially on young willows which it frequently 

 entirely defoliates. It is uncommon on Pallugia in the valley 

 but has never been collected from this plant either on the 

 mesa or in the mountains. 



Tachys sp. This bright golden colored beetle was very 

 abundant along the Rio Jemez below Jemez Pueblo. They 

 were found along the water's edge buried in the sand, each 

 handful contained from several to a dozen. 



Gelastocoris oculata, fab. Here and along most mountain 



