452 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



borings and other debris. When growth is completed the larva bores 

 out to the surface, retreats for several inches, plugging the mine with 

 shredded borings and forming a pupal cell in the pith. The larval stage 

 lasts for about two years. Pupation takes place from January to April. 

 The pupal stage lasts for about one month and the young adult rem.ains 

 in the cell for several weeks before emerging. The first adult was found 

 in the pupal cell on February 20 and in the field on April 12th. The 

 egg stage lasts from thirty to forty days. In the laboratory the female 

 lays from, eight to twenty eggs. The last beetle collected in the field was 

 taken on May 19th. 



D. piperi Webb. — Idaho, Washington, Oregon; m.ale elytra entirely 

 orange, female elytra bluish green with narrow orange margins, sm.aller 

 species, 15 to 20mjii. long; mines stem.s of black berried elder (S. melan- 

 ocarpa). At Bourne, Baker County, Oregon, on June 29, 1910, males 

 and females were common on the foliage of shrubs which had just blos- 

 somed. Many pairs were copulating. 



D. auripennis Chev.-— California; male elytra entirely orange, female 

 elytra with broad orange margins but always with a darker blue green 

 or purple discal area which may vary in size from a mere spot to one half 

 the area of the elytra ; larger species, 23 to 28 mm,, long ; mines stems of 

 the blue berried elder (S. glauca) at higher elevations in the Sierras. Medium 

 and large larvae were taken in the pithof the bases of stems of bushes near 

 Ellis Meadows, Sierra National Forest, on May 16, 1921, at an elevation 

 of about 5500 feet. One of the large larva pupated May 31 but failed to 

 transform. Adults were taken in ntimbers on the flowers and foliage 

 during July and August, 1914 and 1915, along the Lincoln Highway in 

 El Dorado County, at an elevation of from 5000 to 5500 feet. Plants 

 at lower elevations did not appear to be infested. The life cycle is two 

 years, half grown larvae being found in July. 



In case of damage the trunks of the trees to be protected should be 

 sprayed the first of June with the Craighead arsenate of lead-miscible 

 oil emulsion or some other good ovicide. 



