1170 



FAMILY LIII. 



■CHRTSOMELIDJE. 



2167 (6907). Galerucella decora Say, Long's Second Exped., II, 1S24, 



294 ; ibid. I, 195. 



Oblong, scarcely wider behind, subdepressed. Dull yellow or dusky 

 brown clothed with fine, short, yellow, silken pubescence; antennae wholly 

 piceous or with the basal joints partly dull yellow; legs pale. Thorax twice 

 as wide as long, narrower in front, sides curved, hind angles slightly promi- 

 nent, base oblique each side ; disk with a vague median impression and a 

 large, shallow one each side, marked with piceous. Elytra scarcely widened 

 behind, surface coarsely, deeply and rather closely punctate. Length 4.5- 

 5.5 mm. 



Lake County ; scarce. May 2 j -June 30. Occurs on willow. Has 

 the same range as cacicollis and, like it, probably confined to the 

 northern third of the State. 



2168 (6912). Galerucella luteola 'Mull., Melanges Soc. Roy. Turin, 1766, 



Oblong, subdepressed. Dull olive or 

 greenish-yellow, finely pubescent ; h e a d 

 with a black spot on vertex and another 

 between the eyes ; thorax with three black 

 spots ; elytra with a stripe on sides and a 

 narrow, short line on middle of base, 

 black; abdomen piceous. Thorax more than 

 twice as wide as long, slightly narrowed 

 in front ; disk with an oblique depression 

 each side and a shallow pit on median line 

 near apex ; surface rather sparsely punc- 

 tate. Elytra with sides nearly parallel, 

 margins flattened, surface rather finely 

 and evenly punctate. Length 5-7 mm. (Fig. 

 510.) 



This is the injurious "elm-leaf 

 beetle/' introduced from Europe into 

 the United States near Baltimore 

 about 1837. Since then it has gradu- 

 ally spread southward and westward 

 and reached Harrison County, Indiana, about 1905, probably by 

 way of the Ohio River. It is abundant on the elms of Laconia, 

 Elizabeth and Corydon in that county, from which the specimens in 

 the collection were obtained. The beetle hibernates as imago be- 

 neath bark, in cracks of wood and other shelter, and emerges to 

 feed on the first opening buds in spring. The eggs are laid in 

 clusters of five to 20 or more on the lower side of the elm leaves and 

 hatch in about a week. The larva? feed on the under side of the 

 leaf, gradually skeletonizing it. They reach full growth in 15 to 20 

 days, and then crawl or fall to the ground and change to pupae, 



