Biological Papers. 183 



the timber they seemed to grow more numerous. Presently 

 a pair was found in copula, and then another pair, and soon 

 I realized that here at last I had found the home of Cicindela 

 transversa. Not a single limbalis was found with them, and 

 only one transversa sustained the humeral and posthumeral 

 dots to show any affinity to limbalis. On the other hand, a 

 number of the specimens had green or blue head and thorax, 

 agreeing exactly with our eastern forms of splendida. Speci- 

 mens of this last were frequently found in copula with typical 

 ti^ansversa, thus establishing splendida as a variety of trans- 

 versa, and so of purpurea. But why had these two species, in 

 this particular locality, abandoned the sun-baked clay-banks 

 and retired to the woods? And why were there no signs here 

 present of the closely associated forms limbalis and amoena? 

 These two questions remain a puzzle to me. 



May 14 was devoted to the capture of transversa and splen- 

 dida at Kimmswick, south of St, Louis, and over thirty speci- 

 mens were taken. They were found along a shady, winding 

 road that ran among the wooded hills, and were more abun- 

 dant at high elevations. The proportion of the two species was 

 about eight transversa to one splendida. Fewer pairs were 

 found copulating than on the previous week. Sexguttata as- 

 sociated with them, but was much less plentiful. A single 

 purpurea was taken along the open road, and several vulgaris 

 and 12-guttata on the banks of a shallow stream. Another 

 trip to the same locality was made on May 28, but the best 

 time for finding transversa had apparently passed, as only 

 a few were taken, and those largely imperfect. 



The following table attempts to affiliate the numerous vari- 

 eties of purpurea. Forms numbered consecutively are closely 

 related, and each form is derived from the preceding form of 

 higher notation, C. denverensis occurs in two forms, corres- 

 ponding to splendida and amoena in markings, which have not 

 received distinctive names, C. cimar-rona has resulted from a 

 fusion of graminea and audubonii, together with a change of 

 markings, in the high table-lands east of the Rocky Mountains, 

 as shown by a series taken by Doctor Snow in South Park, 

 Colo,, which exhibits every possible stage of transition from 

 graminea and audubonii to cimarrona. 



