The Biology of Maine Species of Altica. 195 



Description of the Egg. 



Subcylindrical, irregularly elliptical ; surface minutely punctate and 

 finely sculptured, entirely divided into polygonal areas, though the sculp- 

 turing is frequently obscure ; color orange, length about 1 mm. The 

 eggs are shown in figure 12D. 



Description of the Larva. 



Description of the full grozvn larva. Head, legs, protho- 

 racic and anal shields shining black ; genral aspect dark brown 

 or almost black ; tubercles dull black ; anal proleg orange. Length 

 6 mm. 



All of the other characters, such as the general structure 

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

 exactly the same as is described under the larva of the dogwood 

 flea-beetle, page 



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. The setae are all clearly capitate. Length 1.5 mm. 

 Head measurements of the larvae. 



1st instar. Minimum, .31 mm. ; maximum, .35 mm. ; average, .33 

 mm. (Estimated from 9 specimens.) 



2nd instar. Minimum, .46 mm. ; maximum, .54 mm. ; average, .50 

 mm. (Estimated from 16 specimens.) 



3rd instar. Minimum, .69 mm. ; maximum, .75 mm. ; average, .72 

 mm. (Estimated from 23 specimens.) 



Ratio of measurements: 1.5; theoretical measurements: .33, .50, 

 .75; actual a\erage measurements: .33, .50, .72. 



The Pupa. 



Description of just formed pupa. Bright orange (more 

 orange than that of the alder flea-beetle) ; setae and spiracles 

 dark brown, caudal spines black, appendages translucent ; other- 

 wise exactly like that of the dogwood flea-beetle (see page 160).. 

 Length 4.5 mm. 



Description of the pupa ready to transform. Dorsum of 

 prothorax grayish brown ; metathoracic thickenings brown ; eyes 

 and antennae black ; mandibles dark brown ; wings dark gray ; 

 legs more or less piceous ; otherwise like the newly formed pupa. 

 (The elytra are colorless, although they appear gray as the 

 wings lie underneath them and show through.) 



