144 INSECTS ATTACKING WEEDS IN MINNESOTA. 



and the adult emerged July 17. The larxae are peculiar in that 

 they carry their excrement on the l)ack of their abdomen. There 

 I're probably two broods. The adult is about 3 inches long, of a 

 yellowish color, head and thorax red, and three l)lack stripes on the 

 elytra. 



MULLEIN (rcrbasciiiii fhapsits L. ) Insects. 



The Mullein Weevil ( Gyiiiiicfroii tclnnii Fab.j. 



This species can be found swarming on the ])lant during the 

 summer. On August 11. the larvae were nearly full grown in the 

 seed pods. The adult beetles are black, robust and measure about 

 3 mm. in length. 



GOLDF.X ROD (Solidago canadensis Lj Insects. 



The Goldenrod Leaf Beetle (Trirhahda canadensis, Kirbyj. 



These steel-blue larxae occur very abundantly on this plant 

 during June. Pupation took place July 4, about one-half inch below 

 the soil in the breeding cage. On July 13, adults emerged. 



Larva — Length, about 10.5 nun. (ieneral color, steel-blue, with 

 ventral surface lighter. Head black. 



The Goldenrod Leaf Miner (Agromyza posit icata \Ig.) 



The tips of the lea\es are blackened by this little dipterous 

 leaf-miner. ( )n June 23, lar\ae pupated and on Jvily 16, an adult 

 emerged. Others collected on June 2'>, emerged on July 23. 



Larva. — Length, al)Out 4 mm. The two mouth-hooks are black, 

 in frr)nt of which is a black, T-shaped structure. The horizontal 

 portion of the T is curved. 14ie spiracles are situated on rather 

 long pr( ijections. 



Gnorimoscheina arfiniisiella Kear. 



The larva of this little moth was also found mining in the tips 

 of the leaves of the golden rod, on June 29, making an elongated 

 iildtch mine. ( )ne adult emerged on July 30. This species was 

 also reared from .Irfiniesia ahrofaniint. not, however, as a leaf miner, 

 but as a web-worm. 



(Bidtonia asteroidcs (L) L'llerj . Inthononuis .Sp. 



Seeds of this plant were also collected b\- Air. Oswald and con- 

 tained ])oth larvae and adult weevils. 



