Bees from New Mewico. 127 
the bluish lustre on the abdomen, in the shorter metathoracic 
enclosure, &c. H. semiceruleus, however, has the first two 
abdominal segments nearly as in anomalus, not as im 
perdifficilis. 
Halictus armaticeps, Cresson. 
Las Vegas, June 17, at flowers of Convolvulus arvensis, 9 
(Ckil.) ; July 29, at flowers of Verbesina encelioides, ? (Ckil.) ; 
Beulah, May 30, at flowers of Salix, 2 (W. Porter). This 
is the insect heretofore reported from New Mexico as 
IT, ligatus, but Mr. Ashmead believes it is not the true igatus 
of Say, aud I must agree with him, after comparing Say’s 
description. 
Halictus bardus, Cresson. 
Beulah, May 30, at flowers of Salix, 2 (W. Porter). 
Halictus coriaceus, Smith. 
Beulah, May 30, at flowers of Salix, 9 (W. Porter). 
Halictus Lerouxti, Lep. 
Las Vegas Hot Springs, at flowers of Saliva, 2 (W. Porter): 
New to New Mexico. 
Halictus mesillensis (Ckll.), var. @. 
?. Head and thorax olive-green. Las Vegas, Aug. 5, at 
flowers of Aplopappus spinulosus, 9 (Ckil.). This differs 
from H. nymphalis (received from Mr. Robertson) by the 
distinctly punctured first abdominal segment, the rather 
smaller size, and the darker, less brightly coloured tegulie. 
The original mesillensis, described as a variety of nymphalis, 
has also the punctured first abdominal segment. 
Halictus pruinosus, Rob. 
Las Vegas, July 5, at flowers of Verbesina encelioides, 
(S. L. Mize); July 11, at flowers of Cleome serrulata, 9 
(Ckil.) ; July 31, at flowers of Grindelia, 2 (Ckil.). 
Halictus ruidosensis, Ckll. 
Beulah, July 26, five females (IV. Porter). 
Halictus sisymbrii, Ckll. 
Las Vegas, June 17, at flowers of Convolvulus arvensis, @ 
(Ckil.) ; July 31, at flowers of Cleome serrulata, 2 (Ckil.) ; 
July 2, at flowers of Szdalcea neomexicana, 2 (M. Holzman), 
