126 Prof. T. D. A. Cockerell on 
Prosapis rudbeckia, subsp. ruidosensis, Ckll. 
Beulah, July 28, Aug. 18 (Ck/.). 
Prosapis tridens, Cill. 
Beulah, July 28, 2 ¢, with face-marks light yellow (Ckdl.). 
New to New Mexico. 
Prosapis varifrons, Cress. 
Beulah, July 28, 5 g (Ckil.); Dailey Cahon, Aug. 10 
(T. D. A. & W. P. Ckil.). New to New Mexico, 
Halictus amicus, Ckll., var. a. 
@?. Face narrower than type; possibly a distinct species. 
Las Vegas, at flowers of Gaura coccinea, June 18 (Chil. & 
Porter). The Gaura is properly a moth-flower, but is more 
or less visited by bees when it first opens. 
Halictus anomalus, Rob. 
Las Vegas, at flowers of Convolvulus arvensis, June 17, 3 
(Ckil.); July 4, 9 (Ckil.) ; July 29, at flowers of Verbesina 
encelioides, 9 (Chil.); Aug. 14, at flowers of Grindelia 
squarrosa, 2 (Martin D. Ckli.). New to New Mexico, 
Robertson says the abdomen of anomalus is impunctate, but 
the punctures can be seen with a compound microscope. 
This species has only two submargiual cells, and as it has 
the size and form of H. perdifficilis, I wondered whether the 
Las Vegas specimens might not merely be aberrant examples 
of that insect. A close examination, however, revealed the 
following important differences :— 
H. anomalus trom Las | H. perdifficilis, type from 
| Vegas (2). | Santa Fé (). 
Ist abdominal With sparse minute punc- | Distinctly and — strongly 
segment. | tures; not tessellate. | tessellate; sparsely punc- 
| | tured. 
2nd abdominal Stronger punctures; not Distinctly — transversely 
seyment,  tessellate; anterior and lineolate ; rather closely 
posterior halves punc-| punctured on anterior 
tured alike. | half, practically impunc- 
| tate on posterior. 
Median line of Not grooved; a mere line. | Strongly grooved. 
mesothorax. 
Mesothorax. | Bluish green. | Brassy green. 
Metathorax. Same colour as rest of | Dark blue, contrasting. 
thorax. | 
H. anomalus differs from H, semiceruleus in not having 
