THE LEAF BEETLES. 1145 



third joints equal, the fourth as long as fifth. Each elytron has 

 eleven stria 2 , seven of which are between the suture and the um- 

 bone, while two run parallel with the side margin. Between these 

 two sets, that is, just outside the seventh, are two short striae which 

 begin from a common point behind the umbone. These are the so- 

 called "short stria-" of the key. The species resemble the common 

 and variable Ttjpopliornn < unrllns, but are mostly larger and much 

 more constant in color. Five species have been taken in the Stale, 

 while one other perhaps occurs. 



KEY TO INDIANA SPECIES OF METACHKOMA. 



<i. Thoracic punctures, when present, round, not strigose. 



h. Suture between the clypeus and front obliterated, the groove above 



the eye not extending on the front. 

 c. Head and thorax more or less punctate. 

 <1. Form more or less oval ; thorax with very distinct side margins 



which, when viewed from the sides, are convex downward. 

 f. Sixth to eleventh strhe of elytra much confused; thorax one- 

 half wider than long, sides feebly curved; elytra dull yellow. 



2120. ANUUSTULUM. 



ee. Striie of elytra regular except the two short ones; thorax 

 nearly twice as wide as long, its sides strongly curved; ely- 

 tra dull yellow with oblong dark spaces. 



2121. INTERRUPTUM. 



diL Form parallel; thorax very feebly margined on sides, the mar- 

 gins straight ; color mainly piceous. 2122. PARALLELUM. 

 cc. Head and thorax almost entirely smooth; color dull yellow. 



L.KVK'Ol.I.E. 



lih. Suture between clypeus and front distinctly grooved and formed by 

 the oblique extension of the groove above the eye; color dull yel- 

 low; elytral punctures coarse and in regular rows. 



212.".. PALLIDUM. 



mi. Thorax densely and strigosely punctate; color mostly piceous. elytra 

 sometimes with reddish spots; elytral punctures line and more or 

 less irregular. 2124. QTERCATUM. 



212() (<>7r>3). METACHROMA ANGUSTUTATM Crotch, Proc. 1'hil. A cad. Nat. 



Sci., 1ST::, 41. 



Oblong-oval. Upper surface 1 , legs and base of antenna 1 dull yellow; un- 

 der surface piceous; outer six joints of antenna 1 black. Head sparsely punc- 

 tate, more coarsely and closely on clypeus. Thorax one-half wider than 

 long, slightly narrowed in front: disk convex, sparsely and rather finely 

 punctate. Elytra with the tirst three to live rows of punctures regular or 

 nearly so. the others much confused, especially toward the apex: intervals 

 smooth. Length (5-15.5 mm. 



1 ake, Porter, Starke and Posey counties; scarce. June 5-Jnly 

 8. Beaten from dead willow. A species of western range, there- 

 fore probably to be found only in the western portion of the State. 



