114 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



Remarks. — Schott (1894) gives a figure of this variety, which Tull- 

 berg described from Nova Zembla. 



Dr. MacGillivray gave me two cotypes of his variety montana. One 

 of them agrees with cincta in the position of its broad blue bands. 

 The other disagrees; having narrow blue bands along the posterior 

 margins of the segments, such as often occur in the typical form of 

 viridis. 



Distribution. — Recorded as foUows: 

 New Hampshire: Franconia, Mrs. A. T. Slosson (Museum of Comparative 

 Zoology). 



ISOTOMA aSOTOMA) VIRIDIS Boarlet rariety ARCTICA Schott 



Isotoma viridis var. arctica Schott, 1894, p. 61. — von Dalla Torre, 1895, p. 

 10.— MacGillivray, 1896, p. 58.— Schaffer, 1896, p. 185; 1900a, p. 245.— 

 FOLSOM, 1902a, p. 96. 



Description. — Ground color yellow, sometimes shading into pur- 

 plish. Dorsum with dark blue or blackish markings, particularly a 

 deltoid marking on each of the last seven segments, by which the 

 variety may be recognized. The region of the median dorsal line is 

 for the most part unpigmented. Maximum length, 7 mm. 



For a figure of this variety see Folsom, 1902a. 



Remarks. — This variety has seldom been reported. Schott's two 

 types were taken by the Vega Expedition at Port Clarence, on the 

 American side of Bering Strait. SchiifTer gave southern Russia as a 

 second locality. Three specimens (U. S. National Museum) were 

 collected on Popof Island by Prof. T. Kincaid, of the Harriman 

 Expedition. 



ISOTOMA (ISOTOMA) VIRIDIS Bourlet variety DELTA MacGillivray 



Plate 37, Figure 435 



Isotoma viridis var. delta MacGillivray, 1896, p. 58. 



Description. — Yellowish, marked with black. This variety was 

 characterized simply as having "each segment marked with three 

 closed and united deltoid-shaped marks." 



Remarks. — In the cotype from which plate 37, figure 435, was made, 

 the only marks that are evidently deltoid are the median dorsal marks 

 on the mesonotum to the second abdominal segment, inclusive. Two 

 Texas specunens in my collection are less heavily marked than the 

 cotype, but are nevertheless recognizable. 



Type.— U.S.N.M. no. 42970. 



Distribution. — Recorded as follows: 



Mississippi: Agricultural College, H. E. Weed. 



Texas: College Station, December 22, C. A. Hart; March 28, under trash, W. L. 

 Owen, Jr. 



