142 INSKCTS ATTACKING WEEDS IN MINNESOTA. 



Ijristles and two transverse rows of bristles wliicli ari^e from jiromi- 

 nent tubercles on rest of the thorax. Tij) of the abdomen with a 

 large stout spine on each side. 



Larva. — Length, about 5 mm. x 2 mm. \\ ide. White in coUjr 

 except Iiead. which is yellowish. Mandibles with, two teeth the 

 lower one the larger, and dark brown. Labrum somewhat wider 

 at the base with bristles in front and with two longitudinal black 

 lines. Antennae very minute, one-jointed. The following" parts 

 of the head are darkest ; tip and base of mandibles, spots near tipper 

 corners of clypeus and circular spot just laterad of the antennae. 

 Head with a few rows of slender hairs. Body strongly curved and 

 covered with very short sparse hairs. Idie ^■enter c>f the thorax 

 has three fleshy lobes, each of which ])ears several hairs. 



Egg. — Length, 4 5 mm. x 3 5 mm. wide, (ireenish i>v brown- 

 ish ; shai)e elliptical ; chorion Aery dense and smooth. 

 The Evening Primrose Bud Caterpillar i Mouil'Iia stcllela, lluscky. 



This little Tineid lar\a works in. the buds during July and 

 August. The pupal stage lasts about three or four weeks, one 

 adult having emerged on Sei)tember 8. 



A small, legless beetle larva nearly one-quarter inch long is also 

 present in the buds, hut have been unable to rear it. .Icaiithoscelis 

 accplialus Sa\, which ma\' be the ])arent form, was found on the 

 plants earl\- in the summer. It is. however, recorded as breeding 

 in the ])ods. 



The Evening Primrose Leaf Worm i nijli>iiia ornotlivana. Rilevy. 



( )n julv 12, LiU), a small, greenish larAa nearlv one-half inch 

 long was observed in the terminal leaves. The larva built a gray- 

 ish silken ccjcoon in the breeding jar, the adult moth having emerged 

 on July 24. ddie wings are yellowish while the terminal portion 

 is reddish. The species was not common here. 



MILKWEED (Asclcfias syriaca L.) Insects. 



The Milkweed Snout Beetle (Rliyssciiiafiis liitroticollis Say). 



This si)ecies is recorded as breeding in the ])ods of milkweed, 

 l)Ut 1 ha\c not observed them doing so here, llowexer, they were 

 found breeding in the stems here. The adults were observed on the 

 ])lants on June 2*-'. making long, ugly, conspicuous gashes in the 

 stem where they were ovi])ositing. Two or three cuts were made 

 on each stem, inside of which tliree or four eggs were found ])eneath 

 each cut. August 30. the lar\a entered the soil to ])U|)ate, l)Ut 1 did 

 not succeed in rearing the adult. 



