222 THE CANADIAN ENTOMOLOGIST. 



The specimens from either Jamaica or Ceylon differ as much in 

 size and colour among themselves as they differ from those of the other 

 locality. 



The Jamaica specimens agree quite closely with Mr. Newstead's 

 description, and vice versa. 



To form an idea of the variability of this species one has only to 

 note the fact that Mr. Cockerell distinguished four varieties in addition 

 to the typical species growing on various plants in Jamaica. 



The most prominent characters, which are constant, are, first, the 

 elongated shape, tapering posteriorly, and second, the presence of the 

 peculiar waxy filaments which are quite distinct from the ordinary white 

 filamentous secretion of the genus. 



The antennas are quite variable, as may be seen from the following 

 measurements of the type material from Jamaica: First joint, 45-60/^3 

 second, 55-80//.; third, 85-95 /x j fourth, 45-55/^; fifth, 50-65 /x ; 

 sixth, 55-60 /x; seventh, 53 /^ ; eighth, 1 15-120 /x. 



Measurements of the Ceylon material vary as follows : First 

 joint, 59-65 /x ; second, 67-76 /x; third, 90-104 /x; fourth, 53-57/'; fifth, 

 53-65 /x; sixth, 51-62 /x; seventh, 56-62 /x ; eighth, i20-r27/x. I have 

 also recently examined specimens from Mexico, and find them to fall 

 between the Jamaica and Ceylon specimens in size. It will be noticed 

 that the Ceylon specimens are longer than those from Jamaica. 



The variations in relative length are well shown in the following 

 antennal formula : 



Jamaica specimens. Ceylon specimens. Mexico specimens. 



(83)(24)(567) 382(4567) 832(45)(i6)7 



83267(45) 83216745 8324(16)57 



83(26)157)14 8321(67)54 



832(156)47 83245716 



812(4567) 



Joint 3 of the antenna is, however, always quite long, always appre- 

 ciably longer than 2, 



Legs agree perfectly with the published descriptions. 



After this careful examination, I am convinced that these are all one 

 species, and since Mr. Cockerell published his virgatns, about a year 

 previous to Mr. Newstead's publication oi cerifenis, D. cerif erics, Newst., 

 will stand as a synonym for D. virgatus, Ckll. 



The Mexican specimens were collected on coffee at Cuantla, Morelos, 



