The B.ology of Maine Species of Altica. 175 



DESCRIPTION OF THE EGG. 



Subcylindrical, irregularly elliptical, surface minutely punctate and 

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

 turing is frequently obscured ; color varying from yellow to dull orange ; 

 length about 1 mm. The eggs are shown in figure 12B. 



DESCRIPTION OF THE LARVA. 



Description of the full grown larva. Head and legs shin- 

 ing black ; prothoracic and anal shields more or less brown ; 

 general body color greenish yellow above and below ; tubercles 

 brown ; general aspect almost black early .in the instar, and light 

 yellowish late in the instar ; anal proleg light lemon yellow. 

 Length 5-5.5 mm. 



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 the dogwood flea- 

 beetle (page 157), except that tubercle iii is very rarely pres- 

 ent on the mesothorax and if present is merely vestigial, and 

 that tubercle iii is frequently absent on the metathorax as well, 

 and if present is usually more or less vestigial. Both are non- 

 setiferous in any case. There is frequently present an extra 

 non-setiferous mid- ventral chitinization on the anterior edge 

 of the thoracic segments. 



Description of the newly hatched larva. The arrangement 

 of 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, 27 mm. ; maximum, .31 mm. ; average, .30 

 mm. (Estimated from 11 specimens.) 



2nd instar. Minimum, .46 mm. ; maximum, .50 mm. ; average, .47 

 mm. (Estimated from 11 specimens.) 



3rd instar. Minimum, .62 mm. ; maximum, .66 mm. ; average, .64 

 mm. (Estimated from 17 specimens.) 



Ratio of measurements : 1.56. Theoretical measurements : .30, .47, 

 .73 ; actual average measurements : .30, .47, .64. 



