434 



THE CANADIAN ENTOMOLOGIST. 



with lighter coloured setae. The general colour is green, owing 

 to the chlorophyll of the leaf on which it feeds. 



The pupa is yellow and is found in a small cell in the soil 

 around the affected plants. 



The adult is an elongate oval beetle, piceous. Elytron with 

 narrow yellow sinuate vitta. Head punctulate, thorax and elytron 

 punctate. Antennae not quite half as long as body, joint 4 in the 

 male equal in length but much wider than joint 2 or 3, joint 5 

 longer than the preceding two and much dilated. Except for the 

 broad post-humeral branch, the vitta is almost uniform in width 

 throughout; the distal portion is usually very slightly wider than 

 the middle portion, but quite often the width is practically 

 uniform throughout; the proximal portion of the vitta does not 

 bend towards the suture, but is almost parallel to it. 



Length 2.5 mm. 



Fig. 37 — Phyllolreta sinuata 

 Steph., male. 



Fig. 38 — Phyllotreta vitlala 

 Fab., male. 



The following are the chief points of difference between 

 P. sinuata and P. vittata. 



1. P. sinuata is larger, measuring 2.5 mm., while P. vittata is 

 2.0 mm. long. 



2. In sinuata the length of the antennae is quite equal to half 

 that of the body, but in vittata it is somewhat greater. 



3. The fifth antennal joint of the male in sinuata is very 

 much broader than the preceding joint and slightly longer than 

 the combined length of joints 3 and 4, while in vittata the corres- 



