1204 FAMILY LIII. CHRYSOM ELIDE. 



pleume yellow ; antennfe usually fuscous, the basal joints pale. Thorax 

 nearly twice as wide at middle as long; surface finely alutaceous, minutely 

 and sparsely punctured. Elytra one-half wider at base than thorax, um- 

 bone distinct ; surface rather closely and irregularly punctate. Last ven- 

 tral of male flattened, truncate at ai)ex and with a short, acute process at 

 middle. Length 3.5-4 mm. 



Putnam County; scarce. July 25. Swept from flowers of the 

 darkey-head, EudbecMa triloha L. Occurs from Pennsylvania to 

 Illinois. 



LIX. Lactica Er. 1847. (L., ''milk.") 



Small oval yellow or blue and yellow species having the head 

 inserted in the thorax as far as the eyes ; antenna^ longer than half 

 the body, third joint shorter than fourth, joints 4 to 10 equal, 11th 

 very little longer. Thorax with a deep, transverse impression near 

 the base, which is bent at each end abruptly toward the base ; front 

 coxal cavities open behind ; tarsi more than half the length of the 

 tibiae, the claM^s appendiculate. 



2229 (6976). Lactica iris Oliv., Ent., VI. 180S. 702. 



Oval, slightly oblong, moderately convex. Head and thorax yellow ; 

 elytra deep violet blue, shining ; antennae piceous, three basal joints pale ; 

 thorax beneath and front and middle legs pale yellow ; metasternum, abdo- 

 men and hind legs piceous. Thorax about twice as wide as long, margins 

 narrow ; disk convex, not visibly punctate. Elytra not wider at base than 

 thorax, umbone rather prominent, surface very finely punctate. Length 3.5- 

 4 mm. 



Posey County ; rare. September 5. One of the prettiest of our 

 small Chrysomelids. 



Diphavlaca bicolornta Horn, head, thorax and legs reddish-yel- 

 low, elytra and abdomen piceous-purple, length 2 mm., is known 

 from Michigan, Georgia. Kansas and Louisiana. 



LX. Trichaltica Harold. ISIG. ('Gr., "hair 4- leap.") 



This genus comprises one small, ol)long reddish-yellowy and blue 

 species, differing from Lactica mainly by the elytral punctures 

 being much coarser and arranged in ten distinct rows. Front of 

 head with two distinct tubercles; outer joints of antenniB slightly 

 thicker, joints ]. 4, 5 and 11 longer than tlie others, which are equal. 



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