THE CANADIAN ENTOMOLOGIST. 61 



dark spaces. Under surface variable in colour, thorax coloured 



like the elytra. .24-. 26 in rubra, Web. 



AA. Elytral punctures in eight rows, costai acute. Colour variable, 

 usually with head dark, thorax and elytra pale with dark spots of 

 irregular shape. .15 in nervosa, Panz. 



Tribe XI. — Cassidini. 



These are the '' tortoise beetles " or " helmet beetles " found on morn- 

 ing glories and other convolvulacea?. They are easily recognized on 

 account of the peculiar form, which is circular or elliptical in outline, the 

 upper surface convex, the margins of elytra and thorax explanate (to a 

 varying degree), the head concealed. Some of them, notable Coptocycla 

 aurichalcea, which, with its larva, is often abundant on the morning 

 glory, are of most brilliant golden and greenish tints when alive ; these, 

 however, being lost at or after death. The three genera found in Canada 

 are as follows : 



Size large (.38-.46 in.), form more elliptical. 



Head partially exposed, thorax and elytra spotted . . Chelyinorpha. 



Head entirely covered, thorax spotted, elytra plain .... Physonota. 



Size small (.20-. 30 in.), head entirely covered, antennae longer than 



thorax Coptocycla. 



Coptocycla, Chevr. 



Three species are recorded, one of which, C. clavata, Fabr,, is easily 

 known by its size (.30 in.), the brown elytra, which are roughened and 

 gibbous, and the transparent spot on the middle of the outer margin. It 

 occurs on the " ground cherry." The others have the elytra nearly even 

 without gibbosities, and are closely allied. Mr. Crotch separates them 

 by the fact that in aurichalcea, Fabr., the body beneath and the last four 

 joints of the antennpe are black, while in guttata, Oliv., the sides of the 

 body beneath are reddish and the last two joints of the antenui^ are 

 black. Both are of about the same size, a trifle under a quarter of an 

 inch in length. 



Physonota, P>oh. 



A rather large insect of a greenish or pale yellow colour, the thorax 

 spotted, the principal and most constant spot being a large one near the 

 middle. Two others are usually present near the base. Elytra not 

 maculate. It is described by Say as P. unipuuctata. 



