286 



Journal New York Entomological Society, t^'oi- xxii. 



with many other occupations, in making known the Coleoptera of 

 West Point and Virginia, and may be described as follows: 

 Arthromacra robinsoni new species. 



Vivid green above, dark cupreous beneath ; pronotum smooth, shining, 

 distantly punctate ; antennse, mouth parts, tibiae and tarsi fuscous ; the an- 

 tennal joints, except the tenth, scarcely serrate, the eleventh joint very long 

 in the male, 2.12 mm. in actual length, much longer than in A. anea, and 

 equal to at least six preceding joints combined, shorter in the female, equal 

 to about four preceding joints. A little smaller, but otherwise similar to 

 A. a-nea, the elytra similarly rugosely punctate with faint indications of longi- 

 tudinal costse, and the tarsi similarly hairy beneath. Length, male, 8.0-8.5 

 mm. ; female, 1 1 mm. 



Occurs in Nelson Co., Va. Type male and female in my collection. 



A. (male) B. (female) antenna; of A. robinsoni. 

 C. (male) D. (female) antenna of A. ccnea. 



The proportions of the antennal joints are shown in the drawings, 

 herewith reproduced, of Mr. C. E. Olsen. He detached the antennae 

 from the specimens and mounted them on slides, so that they could 

 be drawn with the precise accuracy of microscopic measurements. 



In A. robinsoni, being a smaller insect, the entire antenna is shorter 

 than in A. crnca; but in both sexes the last joint is actually longer, and 

 proportionately very much longer, as shown by the figures and meas- 

 urements of Mr. Olsen, viz.: 



A. robinsoni, male, entire antenna = 5.25 mm., last joint = 2.12 mm. 



A. robinsoni, female, entire antenna = 4.75 mm., last joint =1.5 mm. 



A. ccnea, male, entire antenna = 6.00 mm., last joint =1.75 mm. 



A. anea, female, entire antenna = 5.50 mm., last joint =1.3 mm. 



In A. robinsoni the last joint of the male equals at least six preced- 

 ing joints, the last joint of the female about four; in ccnea the last 



