220 



Tiger-beetles are generally most abundant in open places, but this 

 beetle seems to be a woodland species like the brilliantly colored C. 

 sexguttata Fabr. Wickham ('99, pp. 210-21 1) records unipitnctata 

 from wooded areas. It is rare and difficult to catch, and is said to 

 be nocturnal in habit. 



Carabid^ 



Calosonia scrutator Fabr. Caterpillar-hunter. 



This common arboreal beetle was taken Aug. 16 (No. 64) in the 

 upland Bates wood (Sta. IV, a), where it attracted attention by the 

 rustling sound it made in crawling among the dry leaves on the 

 ground. Specimens of these beetles I could easily secure by remain- 

 ing quiet and listening for this rustling of the leaves. One specimen 

 was seen to crawl up the trunk of a small oak-tree, three or four inches 

 in diameter, for about seven feet. Another individual I took from 

 my neck. It may have fallen upon me from a tree, but more prob- 

 ably it climbed upon me as it does a tree. In woods adjacent to the 

 Bates forest, a caterpillar-hunter (No. 97) was found Aug. 20 with 

 what appeared to be the damp cast skin of some large bombycid larva, 

 which was also claimed by an ant, Camponotns herculeanus Linn., 

 subsp. pciinsylvanicns DeG., var. ferrugineus Fabr. On the ravine 

 slope (Sta. IV, b) Aug. 20 T. L. Hankinson captured one of these 

 beetles (No. 100) with a caterpillar about an inch long, which it had 

 partly mangled in the thoracic region with its formidable jaws. On 

 the upper slopes of the ravine (Sta. IV, h) Aug. 23 another beetle 

 (No. 149) was found on the ground under a hickory tree, eating a 

 Datana larva. Along this same rather open forested slope another 

 individual was observed to run from the ground up the trunk of a 

 small white oak (six or seven inches in diameter) for three or four 

 feet, and then to return to the ground. The climbing individuals ob- 

 served took a relatively straight course up the trunk, making no ef- 

 fort to climb in a spiral direction, and made the descent head fore- 

 most. 



At Bloomington, 111., while picking cherries I have taken the 

 beetle in trees. Although the arboreal habit is evidently very well 

 developed in this species, it is also very much at home on the ground. 

 The rapidity and apparent ease with which it ran over dry oak leaves 

 in the upland Bates woods surprised me. 



The active foraging habits of this beetle are well shown by Her- 

 man's observations (Journ. Cincinnati Soc. Nat. Hist., Vol. 21, p. 

 80. 1910) on its killing nestlings of the cardinal grosbeak (Cardin- 

 alis cardinalis) in bushes three feet from the ground. Harris (In- 



