XVI MONTHLY PROCEEDINGS. 



The markings of the elytra are so variable in the specimens I 

 have seen that I have prepared a series of sketches representing in 

 the upper row macukda, and in the lower qaadrmgnata. The hrst 

 figure in each line is the typical form of the two species, and from 

 the series it will be observed that in imtculata the tendency is to 

 become vittate, while in the other the darker ground-color gradually 

 lessens, leaving the elytra simply red, spotted with blue. 



In quadrmgnata the same sexual characters have been observed 

 as in macidata. In the former species the thorax is more nearly 

 ovate, the sides arcuately narrowing to base, while in maculata they 

 are parallel at middle, the disc more convex and shining, and less 

 densely punctured in the former species. The form of the two species 

 is also different, quadrisignata being more slender and cylindrical, 

 resembling Polycaon, while macukda more nearly approaches some 

 Clerides. 



It seems remarkable that Dr. LeConte should have obtained an 

 unique of what seems the rarest species, and that more than thirty 

 years have passed without its recovery. In view of the great vari- 

 ability of the elytral markings of quadrisignata we were disposed to 

 suppress the name proposed by me as a possible variety, but I am 

 noAV confident that we have to deal with two distinct species. 



I have been told that quadrisignata infests grape vines. 



