J ENTOMOLOGICAL NEWS. 7 



humeral and median bands have coalesced into a large pale area 

 enclosing but slight trace of the blue in the form of a spot and 

 two short lines. This is the most extreme form I have yet seen 

 in the direction of the expansion of the yellow bands. 



Fig. 4 represents a contraction of the bands, the humeral 

 breaking up, while the other two do not reach the lateral margin, 

 several specimens from Oregon illustrate this. In fig. 5 the elytra 

 are entirely blue or green, with a small post-median spot of ob- 

 liquely oval form. The spot varies in size and position, and from 

 the indications I have no doubt that specimens will occur with 

 elytra entirely blue. These one-spotted specimens must not be 

 mistaken for bisignatus, which has quite a large spot of red color 

 contiguous to the margin and other specific characters. 



As a rule, the hotter the climate in which the specimens were 

 native, the greater the extent of the yellow color; those repre- 

 sented by fig. 3 are from the extreme southwest of Utah. In 

 colder, and especially damper climates, the blue color predomi- 

 nates; figs. 4 and 5 are from Oregon, although typical forms 

 occur abundantly there also. 



The variety tenellus is from San Diego and Fort Yuma, in 

 California. Its form is more slender than normal, and the mark- 

 ings are as in fig. 2, although a little wider, showing less blue. 



In continuation of the same idea I reproduce the illustrations 



_ 



of the variations of the elytral markings of two species of Psoa 

 published by me in the "Trans. Am. Ent. Soc." 1886, p. xv. 



