160 Maine Agricultural Experiment Station. 1918. 



tinuous, and articulates slightly with tubercle xi, which is chitinized and 

 non-setiferous except on the prothorax ; tubercle xii is contiguous to 

 this segment caudad ; the second segment which is chitinized proximally 

 is barely visible ectad, but is much larger entad ; the third segment, 

 strongly chitinized ectad, is about equal in size to the second ; the strong- 

 ly chitinized fourth segment is the longest of the leg segments ; the short, 

 strongly chitinized distal segment bears a single pulvillus, and a single 

 inward-curved claw. The setae are the same on all of the legs, except 

 that the proximal segment of the prothoracic leg lacks the anterior seta 

 borne on the ectal surface of the other legs. There is no homology 

 between the segments of the larval legs and those of the adults, as has 

 already been explained in the case of the alder flea-beetle. (Woods 1917. 

 Me. Agr. Exp. Sta. Bui. 265, p. 265.) 



Figures. The arrangement of the setae and tubercles of the full 

 grown larva is shown in the following figures ; dorsal aspect, figure 10A 

 (prothorax, mesothorax, metathorax, abdominal segments 1, 8 and 9) ; 

 ventral aspect, figure 11A (prothorax, mesothorax, metathorax, abdomi- 

 nal segments 1, 8, 9 and 10) ; lateral aspect, figure IOC (prothorax, meso- 

 thorax, metathorax, abdominal segments 1, 8, 9 and 10) ; the numbering 

 of the tubercles according to the writer's scheme in corresponding dia- 

 grams, figures 10B, 10D, and 11B respectively; third instar larva, lateral 

 aspect, figure 12E. The structure of the legs, head and mouth parts is 

 exactly the same as in A. bimarginata, and has already been figured for 

 that species (Woods. 1917. Me. Agr. Exp. Sta. Bui. 265, figs. 19-20). 



Description of the newly hatched larva. The arrangement 

 of setae and tubercles on a just hatched larva is the same as 

 that described for the full grown larva. The tubercles are pro- 

 portionately larger and crowded more closely together, and the 

 head is proportionately larger. The setae are all clearly capi- 

 tate. Length, i mm. 



Head measurements of larvae. 



1st instar. Minimum, .29 mm. ; maximum, .36 mm. ; average, .31 

 mm. (Estimated from 35 specimens.) 



2nd instar. Minimum, .43 mm. ; maximum, .52 mm. ; average, .45 

 mm. (Estimated from 17 specimens.) 



3rd instar. Minimum, .62 mm. ; maximum, .71 mm. ; average, .67 

 mm. (Estimated from 31 specimens.) 



Ratio of measurements: 1.45; theoretical measurements: .31; .45; 

 .65 ; actual average measurements : .31 ; .45 ; .67. 



DESCRIPTION OF THE PUPA. 



Description of just formed pupa. Pure creamy white, cau- 

 dal spines black, spiracles and setae dark brown. Length 3-3.5 

 mm.; width 1.5 mm. 



