The Biology of Maine Species of Altica. 183 



Prothorax one-half wider than long; margin comparatively wide; 

 base scarcely wider than apex, regularly arcuate caudad ; sides nearly 

 parallel at the base, convergent at the apex ; basal angles minutely denti- 

 form, prominent ; apical angles obliquely truncate ; surface compara- 

 tively finely but quite densely punctate; ante-basal groove well defined 

 and entire. 



Elytra across umbones one-third wider than the base of the pro- 

 thorax ; each elytron from two and one-half to three times as long as 

 wide, and slightly more than two times as long as the width of the 

 base of the prothorax ; surface alutaceous, comparatively coarsely but 

 densely punctate ; humeral angles obtuse, more or less rounded ; umbo 

 only moderately prominent ; post-humeral depression not strong. 



Scutelhim colored like the elytra, sparsely punctate. 



Body beneath colored like the bod}^ above; abdomen quite densely 

 beset with fine white setae. 



Legs colored like the body above, except the under surfaces of the 

 two proximal segments of the tarsi and both surfaces of the three distal 

 segments, which are brown, and the claws, which are red brown ; the 

 setae of the legs are white. 



Last ventral segment of male sinuate on each side; lateral lobes 

 comparatively large ; median lobe short, semicircular, flat, the extreme 

 edge sometimes slightly reflexed. The last ventral segment of the male 

 is exactly similar to that of A. corni, as shown in figure HE. 



Length 4.5 mm.-5 mm. 



Type locality, Orono, Maine ; male designated as type deposited in 

 the collection of the Maine Agricultural Experiment Station, Orono, 

 Maine. Paratypes (which are also topotypes) deposited in the collec- 

 tions of the Maine Agricultural Experiment Station, Orono, Maine ; of 

 Wesleyan University, Middletown, Connecticut ; of Cornell University, 

 Ithaca, New York; and of the United States National Museum, Wash- 

 ington, D. C. 



Description of the Egg. 



Subcylindrical, irregularly elliptical ; surface minutely punctate and 

 finely sculptured, entirely divided into polygonal areas, although the 

 sculpturing is frequently obscure ; color yellow ; length about 1 mm. 

 The eggs are shown in figure 12C. 



Description of the Larva. 



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

 racic, and anal shields shining black ; general body color almost 

 black, a little lighter ventrally; dorsal and lateral tubercles dull 

 black, ventral tubercles brown ; anal proleg yellow. Length 5.5 

 mm. 



