a 9 o 



111 



1 2 S 



9 9 * 



"11 



Feb., 'o6] ENTOMOLOGICAL NEWS. 47 



of the green races and their probable late development. It 

 will be noticed by those who have plenty of material, that the 

 bright green San Bernardino specimens tend to complete mark- 

 ings, without the interruption of the 

 humeral lunule that should really 

 characterize vibex. The discovery of 

 a variable green form in the Great 

 Basin is of much interest, the remark- 

 able influence upon the beetles colo- 

 nized within its limits having already 1 2 s 

 been touched upon elsewhere. The 

 small lakes, now rapidly drying up, 

 evidently obtained their littoral faunae 

 from some common source, as I have 

 shown.* Minor modifications of color 

 and pattern, resulting in the formation 



of more or less important local races are commonly noticed 

 among the faunae of the various lake shores and Cirindela 

 tranquebarica is, in this respect, no exception. 



The type of this species found most abundantly in the 

 Great Basin is the form obliquata in some of its manifestations 

 — that is to say, a rather widely marked insect of large size, 

 more or less metallic above. There is, however, in Utah 

 specimens, a strong tendency to disappearance of the sub-basal 

 portion of the humeral lunule and the marginal part of the 

 median band, producing an elytral pattern like that of typical 

 vibex. Several of my specimens from Provo are almost identical 

 in this respect with others from British Columbia, sent me by 

 Mr. Harris. At Great Salt Lake, Sevier Lake and Humboldt 

 Lake, there seems to be a larger proportion of blackish, almost 

 non-metallic specimens (the ground color of the upper surface 

 being referred to) with moderately wide complete patterns, 

 while at Bridgeport, California (still within the Basin), occurs 

 a form almost dead black above, fully and widely marked, very 

 different in appearance from those of the more eastern portions 

 of the Basin. 



I have not seen C. plutonica Casey, which is classed by Dr. 



♦American Naturalist, Sept., 1904. Report Entom. Soc. Ontario, 1904. 



