Dec, I9I4-] Leng: New Species of Arthromacra. 287 



joint of the male equals about three and one third precerling joints, 

 the last joint of the female about two and three quarters preceding 

 joints. 



The following details of the capture of this species have been 

 supplied b}' Col. Robinson. " While collecting beetles near my home 

 in Nelson County, Virginia, in the latter part of June, 191 1, I noticed 

 in the wood road that I was following numerous droppings of toads 

 and, in all of these, brilliant golden green elytra of a beetle unknown 

 to me. On June 30 I took one of these beetles crawling over dead 

 leaves on the road side. On June 30, 1913, I went to the same locality 

 with the hope of taking others but for some hours my search was 

 unavailing. I finally came to a small opening in the woods where 

 the timber had been cut down several years before and shoots, mainly 

 of oak, had sprouted up around the stumps and reached a height of 

 eight or ten feet. The clumps of these sprouts were very thick. At 

 almost the first stroke of my beating stick there poured into my 

 umbrella a shower of golden green beetles. In a few minutes I took 

 over sixty. They were mating and I took many pairs in copulation. 

 When fresh, the males are brilliant green, the females a red gold with 

 greenish tinge; but after a while the females change to green like 

 the males. To clinch my conclusion that I had a new species, the 

 common form (A. ccnea) was taken abundantly with the green one 

 and the sexes were also mating; but in no case was there any pairing 

 between individuals of different color." 



This species has been compared with A. glabricoUis Blatchley, of 

 which the types were kindly loaned by the author; and no close re- 

 semblance was found. The antennae in A. glabricoUis are similar to 

 those of A. ccnca, the last joint being as long in the male as the three 

 or four preceding joints combined. The thorax of A. glabricoUis is 

 also different from that of A. robinsoni, for while smooth as compared 

 with that of A. ccnea, the tendency to form transverse rugae is still 

 traceable, though reduced to a minimum, while that of A. robinsoni is 

 absolutely smooth and shining, interrupted only by the distant punctua- 

 tion. That A. ccnca is variable in the degree of thoracic sculpture is 

 well shown in a specimen I collected in the mountains of northern 

 Georgia, in which the thorax is strongly transversely rugose, being in 

 that respect exactly opposite to A. glabricoUis, as well as the largest 

 and most southern example known to me. This may be known 

 as ccnea var. rugosccoUis. It is possible that A. glabricoUis should 



