(Hi in '•/■■ ' /// EOPTERA. 





8 rdi /• I . Rhynchophora. 



Beginning with the lowesl family and ending with the 

 highest, we take up firsl the weevils or Rhynchophora, the 

 definitions being taken from LeConte aud Horn's • > 

 fication of thi l >ptera of North America." 



Family Authribida? Beak broad, flat; antennaB straight, 11- jointed; 

 labrum distinct; last spiracle uncovered Say. 



Family Scolytidae. — Bod] thick, cylindrical; beak short, often not 

 apparent ; \>\ gidium surrounded al the edge by th<- elytra; tibia; 

 ii ually serrate. The family of bark-borers or timber-beetles i- an 

 extensive one. They burrow sometimes by thousands under the 

 bark of trees, especially spruce and pine, causing the death and rapid 

 , of the tree by arresting the flow i Their galleries, bur- 



or " mines " usually branch <>ut at righl angles from a single 

 gallery ; the female in this single gal- 

 lerj lays her eggs in notches at quite 

 regular intervals along < n« li Bide; the 

 larvae, <>n batching, mine in a direction 

 at riLfhi angles t" the original gallery. 

 In some cases the mine resembles a 

 bird's track, the galleries radiating 

 from a smgle |Kiint. The larva; are 

 r\ lindrical and foot less. Dt ndroctonus 

 terebrans Oliv., Tomicus pint Say. 

 Dryocostesaffaber. The most injurious 

 Bpecies to the spruce are .\ " ; '•" '"■ °« 



1 , , ■,■ \- i ' larva : l>, inn 



r>i lot iis i/nnin i. A. xylograph us Say), 

 and Xylott rtu bivittatut (Kirl 

 Family Calandrid;p. Beak never narrowed behind th 



Fio. 91 —Calanara oryaos. e,rice weevil: a, larva: ■■'■. pu] j» n - 



