ZOOLOGY 85 



Ehus, and Crataegus (in cultivation), from Mar. 31 to April 26. 



Bombus nevadensis, Ores. Especially at Chrysothamnas 

 pucherlimos. 



Hallictus aberrans? At Plum and Eibes. 



H. amicus, Ckll. At Rhus, Salix and a yellow composite. 



H. pectoraloides, Ckll. At Eibes. 



H. sp. perhaps pruinosus, Eol). At Eibes, Ehus, and wild 

 plum. 



Melissodes agilis, Or. At Cleome. 



Perdita zebrata, Or. Jemez Mts. Aug. At Cleome. 



Sphecodes sophiae, Ckll. On Ehus, uncommon. 



Odynerus (Ancistrolrus) "near to sexcingulatus". Around 

 Eibes and wild plum. 



Pepsis formosa. The Tarantula Killer ranges over the 

 entire Upper Sonoran but is particularly abundant here. 



HEMIPTERA. 



Lygaeus bicricis. Widely distributed but especially abund- 

 ant here. 



L. lateralis, Dall. Active until Nov. 1. 



L. turcicus var. reclivatus, Say. Especially common on 

 Asclepias. Common also on the same plant in the arroyos of 

 the "mesa". Collected at Espanola but not at Taos. Pine 

 Assn. in Jemez Mts. During the winter it is very commonly 

 found under yucca rosettes. 



LEPIDOPTERA. 



Litocala sexsiginata. Abundant during Mar. and April 

 about blooms of Ehus, Eibes., and wild plum. 

 Pieris occidentalis. 



OPUNTIA ARBORESCENS SOCIETY 



On the fans at the mouths of the canons there usually 

 develops a dense thicket of this cactus which is found also 

 very abundantly throughout the Cedar and Pifion Associa- 

 tions. It is entirely absent from a large part of the grassy 

 mesa and occurs only sparingly elsewhere until one ap- 

 proaches the Cedar Assn. The following insects are very 

 characteristic of this plant. 



Carpophilus pallipennis. This beetle deserves to be called 

 "The Cactus Nitidulid" as it is almost universally present on 

 cactus flowers especially of this species. Every blossom will 



