The B ology of Maine Species of Altica. 155 



Key to the Larvae. 



(Including "ignita" of Chittenden.) 



1. Lateral setae (on tubercle vii-viii) 3 in number bimarginata. 



1. Lateral setae 2 in number 2. 



2. Tubercle iii setiferous on both mesothorax and metathorax 



"ignita" of Chittenden. 



2. Tubercle iii non-setiferous or absent on mesothorax and metathorax 



3. 



3. Tubercle iii present on mesothorax 4. 



3. Tubercle iii wanting on mesothorax rosae. 



4. Ground color of larva dirty white corni. 



4. Ground color of larva darker chalybea, torquata, ulmi. 



(No characters are known to the writer by which these can be 

 separated in alcholic material.) 



Key to Living Pupae. 



1. 3 setae on apex of each femur 2. 



1. 2 setae on apex of each femur 3. 



2. Length 5 mm. ; yellow-orange bimarginata. 



2. Length less than 5 mm. ; orange torquata. 



3. Color white corni. 



3. Color yellow 4. 



4. Length 4.5 mm. or more chalybea, ulmi. 



4. Length less than 4.5 mm rosae. 



Key to Alcoholic Pupae. 



1. 3 setae on apex of each femur 2. 



1. 2 setae on apex of each femur 3. 



2. Length 5 mm. or more bimarginata. 



2. Length less than 5 mm torquata. 



3. Length 4.5 mm. or more chalybea, ulmi. 



3. Length less than 4.5 mm 4 



4. Length 4 mm corni. 



4. Length less than 4 mm rosae. 



