184 Maine Agricultural Experiment Station. 1918. 



All of the other characters, such as the general structure 

 of the body and the arrangement of setae and tubercles, are 

 exactly the same as is described under the larva of A. corni 

 (page 157). 



Description of the newly hatched larva. The arrangement 

 of the setae and tubercles is exactly the same as in the full 

 grown larva. The tubercles are proportionately larger, and 

 crowded more closely together, and the head is proportionately 

 larger. Length, 1 mm. 

 Head measurements of larvae. 



1st instar. Minimum, .29 mm. ; maximum, .33 mm. ; average, .31 

 mm. (Estimated from 30 specimens). 



2nd instar. Minimum, .43 mm. ; maximum, .55 mm. ; average, .48 

 mm. (Estimated from 33 specimens). 



3rd instar. Minimum, .62 mm. ; maximum, .74 mm. ; average, .68 

 mm. (Estimated from 65 specimens). 



Ratio of measurements : 1.5 ; theoretical measurements : .31, .48 

 .72; actual average measurements: .31, .48, .68. 



The Pupa. 



Description of just formed papa. Bright orange yellow 

 (not as orange as A. bimarginata Say) ; setae and spiracles dark 

 brown, caudal spines black, appendages translucent; otherwise 

 exactly like A. corni (see page 169). Length 3.5-4 mm; width 

 2 mm. 



Description of pupa ready to transform. Dorsum of pro- 

 thorax shining gray brown ; metathoracic thickenings brown ; 

 eyes and antennae black ; mandibles dark brown ; wings and the 

 greater part of each femur and tibia, piceous ; tarsi black ; coxae 

 brown ; head, between the eyes, dark brown ; otherwise like the 

 newly formed pupa. (The elytra are colorless although they 

 appear gray as the wings lie underneath them and show 

 through ) . 



Biological History. 

 summary of rearings. 



Length of egg stage. A record which was kept of 46 eggs 

 deposited between June 14 and July 21 inclusive, mav be tabu- 

 lated as follows : 



