202 THE CANADIAN ENTOMOLOGIST. 



LiNA, Meg. 



Two species are known from within our limits, both of them oblong 

 insects of moderate size, less convex than Chrysomela. The under side 

 bf the body, the head above and a broad dorsal thoracic stripe with 

 small lateral dot are usually black or greenish-black; the elytra, in cabinet 

 specimens yellowish or sometimes slightly reddish with black spots. 

 These spots, in Z. lappoiiica, Linn., are rounded, or when confluent form 

 transverse bands, while in L. script a, Fabr., they are more elongate, even 

 linear on the disc, and tend to form longitudinal vittge. A form of Z. 

 lapponica in which the ground colour of the elytra is red is often found 

 in spring on willows, sometimes mixed with the ordinary yellowish form; 

 sometimes nearly the whole generation may be red, as is the case at Iowa 

 City this year. Z. scripta occurs chiefly on poplars and cottonwoods ; a 

 variety called cotifluens, by Rogers, has the elytra entirely dark except 

 the outer margins ; and a form with green elytra is mentioned by Mr. 

 Crotch ; — they may be distinguished, however, from the varieties of 

 lapponica by having the claw-joint dentate. My specimens of lapponica 

 range from .25 to .32 in., while scripta averages a little longer. 



Plagiodera, Redt. 



Oval insects of small size and green or blue colour, the upper 

 surface convex, shining; elytra punctato-striate. I usually find them 

 under boards in spring. Mr. Crotch thus separates the two from 

 Canada : — 



Elytral interstices finely punctulate, callus visible. .13-. 17 



in cochleariie, Gyll. 



Elytral interstices subrugulose, no callus. .14-16 'm...viridis, Melsh. 



The name cochlearice is replaced, in the third supplement of Hen- 

 shaw's Check List, by artnoracia, Linn. 



Gastroidea, Hope. 



Contains small species of oblong form, easily recognized by their 

 resemblance to the common G. polygoni, Linn., so abundant on knot- 

 grass. Following the arrangement of Mr. Crotch, they may be thus 

 distinguished : — 



Thorax and legs reddish; elytra green or blue polygoni, Linn. 



Elytra golden, suture purple ; thorax golden, usually purplish on 

 edges • .viridula, DeG. 



Blue or green, head flat, puncmation fine cyanea, Mels. 



The name viridula replaces formosa, Say. All of the above are 

 small insects, ranging from .16 to .20 inch in length. 



