i6o 



ECONOMIC ENTOMOLOGY 



Nymphs. — Also show bright red markings of adult. Very young 

 forms are bright red; mature in less than 2 weeks. 



Control. — Collect bugs in sunny days in winter from trunks of trees; 



spray young forms with tobacco- 

 soap solution. 



Squash Bug (Anasa tristis 

 DeG.). — (Consult Cir. 39, Div. 

 Ent., U. S. Dept. Agr.) Infests 

 pumpkins and squashes. A suck- 

 ing insect which should not be 

 confused with the cucumber or 

 squash beetle. 



Adult. — Dirty blackish-brown 

 above and mottled-yellowish be- 

 neath; ^ inch long; wings folded 

 diagonally across the back; beak 

 4-jointed; ill-smelling (Fig. 102). 

 Eggs. — ^Laid in clusters on the 

 underside of leaves; red or bronze, 

 smooth and shining; slightly flat- 

 tened on two sides; j^^s inch long. Hatching in 8-13 days. 



Nymphs. — When newly hatched they are red and green but later 

 they become black like the adults but without wings and with propor- 



PiG. 102. — Squash bug {Anasa tris- 

 tis): a, mature female; b, side view of 

 head showing beak; c, abdominal seg- 

 ment of male; d, same of female. (After 

 Chittenden.) 



Pig. i03.^Nymphs of squash bug, showing five stages. (After Chittenden, U. S. 



Bur. Ent.) 



tionately longer legs and antennae, later developing wing pads and 

 becoming more and more like the adult. Five moults occur (Fig. 103). 



