April, 'o6] ENTOMOLOGICAL NEWS. 125 



in assemblages of, say, a dozen individuals. None were 

 caught outside an area of about an acre." " In flight these 

 insects allow their hind feet to hang heavily downward, and 

 look as if they were carrying a burden." His single female 

 was one of a pair that were copulating on the wing. 



These enlarged feet naturally suggest those of Dolichopus, a 

 genus of flies somewhat distant from this, in which the males 

 parade their tarsal ornaments assiduously before the females. 

 When the front tarsi are ornamented, the insect stands on the 

 ground to display them, but a case is known in which the 

 middle tarsi are the beautiful ones, and the male of this species 

 hovers over the sitting female so that the tarsi hang before 

 her. In Calotarsa it is not unlikely that both sexes are on the 

 wing while these exhibitions occur, hence it may be very diffi- 

 cult to make close observations of them. 



Before passing to the general description of the new species, 

 I will describe the hind tarsi of the male, as they are ex- 

 tremely interesting and remarkable. 



All the first four joints are compressed, and on the inner 

 surface have a fine brush of close appressed yellow bifurcated 

 hairs, which is best developed on the second and third seg- 

 ments. These joints are all provided with a vertical groove 

 at the distal end, enclosing the proximal part of the succeed- 

 ing joint ; hence the second and third appendages appear in 

 side view as if they arose between two segments. The outer 

 side of the first and second joints has numerous stiff hairs, 

 which end in very slight knobs. 



The first joint has on the upper side near the base a slender, 

 long process, ending in an oval disk ; its basal part is some- 

 what thickened, and has a few of the blunt hairs before men- 

 tioned. 



The second joint has a similar organ arising in a correspond- 

 ing position ; in this case the process is smaller, and at the 

 base is compressed and transparent. 



The third joint has attached to its upper surface, from the 

 base nearly to the apex, a very thin membrane-like expansion, 

 which is of a bright silvery color, and bears a peculiar jet- 

 black pattern. It has somewhat the appearance of a flag, and 



