12(5 



Prof. T. D. A. Cockerell on 



Prosapis rudbeckice, subsp. ruidosensis, Ckll. 

 Beulali, July 28, Aug. 18 {Ckll.). 



Prosapis tridens, Ckll. 



Beulab, July 28, 2 ^ , with face-marks light yellow [Ckll.). 

 Xcw to New Mexico. 



Prosapis varifrons, Cress. 



Bculah, July 28, 5 ^ [Ckll.) ; Dailey Cafiou, Aug. 10 

 {T. D. A. ^ W. P. Ckll.). New to New Mexico. 



Halictus amicus, Ckll.j var. a. 



? . Face narrower than type ; possibly a distinct species. 

 Las Vegas, at flowers of Gaura cucciiiea, Juue 18 {Ckll. ^ 

 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, ? 

 {Ckll.) ; July 4, ? {Ckll.) ; July 29, at flowers of Verbesina 

 encelioides, ? {Ckll.) ; Aug. 14, at flowers of Grindelia 

 squurrosu, $ {Martin D. CklL). New to New Mexico. 

 Iloljertson says tlie 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 : — 



1st abdominal 

 segment. 



2nd abdominal 

 sejrment. 



Median line of 

 mesothorax. 

 Mesotborax. 

 Metathorax. 



H. an(mi(tlu.s from Las 

 Vegas (2). 



With sparse minute punc- 

 tures ; not tessellate. 



Stronger punctures ; not 

 tessellate ; anterior and 

 posterior balves punc- 

 tiued alike. 



Not gTooved ; a mere line. 



Bluish green. 

 Same colour 

 thorax. 



us rest of 



H. perdifficilis, type from 

 Santa Fe ( $). 



Distinctly and strongly 

 tessellate; sparsely punc- 

 tured. 



Distinctly transversely 

 lineolate ; rather closely 

 punctured on anterior 

 half, practically impunc- 

 tate on posterior. 



Strongly gi'ooved. 



Brassy green. 



Dark blue, contrasting. 



H. anomalus differs from H, semicaruleus in not having 



