THK CANADIAN ENTOMOLOGIST. 311 



a transverse band back of clavus and a few spots on disc ; legs and 

 beneath pale. 



Described from two males from Arizona. This is a very distinct form, 

 resembling crataegi and dolosus in colour marking, but belonging to the 

 alternatus group in structural characters. 



Idiocerus suturalis, Fitch. 



This is either a very variable species in colour markings, and 

 somewhat so in structural characters, or else two or more specific types 

 are commonly referred to under this name. In the material before 

 me there are four forms represented, all agreeing in general form and 

 size, but possessing slight structural differences, and marked coloration 

 characters. In general these forms have not been found associated in 

 such a way as to indicate specific identity, but, on the other hand, 

 in no case has the life-history been sufficiently worked out or enough 

 specimens collected to enable one to accurately define specific limits, and 

 it has been thought best to characterize them, for the present at least, as 

 varieties. 



Variety suturalis, Fitch (typical form). 



The typical form is of a yellowish-green colour, becoming lighter 

 towards the margin, with the basal angles of the scutellum and the 

 scutellar and sutural margins of elytra included in a confluent stripe of a 

 rich brown. This stripe narrows down at apex of clavus and then 

 widens and gives way to a smoky area on the membrane. The 

 outer anteapical cell is usually present in this form, and. the antennal 

 disc of the male is moderately large, oval, and about half longer than wide. 



This form was described from N. Y., and is at hand from various 

 points in the mountains of Colo., and has been examined from N. Mex. 

 The other references to this species either refer to this form or the next. 



Variety lunaris, n. var. 



Size and form of typical suturalis, the outer anteapical cell wanting 

 or rarely present as a small triangle in the apex of the costal nervure. 

 Male antennae with the filament slightly swollen on the apical half and 

 dark coloured, scarcely to be called a disc. 



Colour : pale green, a dorsal stripe wider than in suturalis, covering 

 the entire scutellum and extending forward to the posterior margin of 

 pronotum, deep fuscous. This stripe is interrupted on the middle of the 

 clavus by a broad, light crescent, and marked at the apex by a line, 



