BIOLOGICAL PAPERS. 259 



specimen of this species in a eugar-beet field near Bent's Fort, Colo.; 

 and Mr. Knaus captured one at the same place the next day. The 

 insects were in the shade of the beet plants, on moist ground. On 

 July 18, 1903, at Glenwood Springs, Colo., I found the species rather 

 common, but the day was too cloudy for collecting, and the insects 

 disappeared as soon as the sun was hidden by clouds, so that I cap- 

 tured only a small number. 



C. punctulata Fab. Found everywhere from June 10 until No- 

 vember. When captured in the net, emits a strong but not disagree- 

 able odor. Some of the other tiger-beetles emit similar odors, but 

 none of them such a strong one as this. 



C. punctulata var. micans Fab. Occurs throughout western Kan- 

 sas and eastern Colorado. It does not differ from punctulata, except 

 in color, and is usually found associated with that form. At Glen- 

 wood Springs I found sijecimens in which the green or blue color 

 extended over the thorax and head. They had none of the bronzed 

 shade seen in specimens from the plains east of the mountains. They 

 had also much more prominent markings, in some cases a complete 

 middle band. They seemed to be abundant, and punctulata were 

 present with them, but much more rare. The latter had also promi- 

 nent elytral markings. 



C. cuprascens Lee. Common along the borders of the Kansas and 

 Arkansas rivers. Specimens taken from Dodge City westward are 

 more uniformly coppery bronze in color, and are more heavily marked 

 than Topeka and Manhattan specimens. Taken during June, July, 

 and August. 



C. macra Lee. This is properly a variety of cuprascens. Mr. Leng 

 dropped it entirely from the list, on the ground that he was unable to 

 separate it from that species, but his action was based on material from 

 east of the Mississippi river. An examination of material sent him 

 from Topeka and other Kansas points convinced him that he was in 

 error, and he will hereafter include it as a variety. This is also in ac- 

 cord with the views of Doctor Horn. The insect is more plentiful in 

 eastern Kansas than cuprascens, but does not extend so far westward. 

 It is usually without the coppery shade and more greenish in color. 

 There is in nearly all specimens a more evident parallelism of the 

 outer edges of the elytra, and a narrowness in proportion to the 

 length, but the ditlerences in the elytral apex are in some cases 

 the only means of their determination. It has the same season as 

 cuprascens. In addition to the river localities given, I have taken 

 both insects on salt marshes. 



C. knaussi Leng. Found on salt marshes and along the borders 

 of alkali ponds and irrigation ditches, always on moist places. It 

 varies much in color, after the manner of C. sperata, with which it is 



