Insect Enemies of Greenhouse and Ornamental Plants 17 



LARVA. Short, thickened, wrinkled and curled in burrow when 

 at rest; head chestnut brown, lightest in center where it is bisected 

 by two darker lines, arcuate on hind margin; jaws black, antennas and 

 palpi reddish brown. 



PUPA. Pale yellow with black eyes; tip of snout and spines, on 

 abdomen reddish brown, wing-pads dark colored at tips; dorsal surface 

 of head smooth, bearing a few scattered hairs; thorax broad showing 

 a depression on either side and a central suture; abdomen tapering to 

 extremity, each segment furnished with a spine on either side with 

 anal one bearing two and a number of spiny hairs on apex; surface 

 shows several fine hairs upon head with two longer ones above eyes; 

 snout and legs curled downward, wings folded down forming a pad on 

 either side. 



This insect was evidently introduced into New Jersey green- 

 houses in orchids imported from some tropical country of the Eas- 

 tern hemisphere. During the middle of the day the beetles seem 



Fig. 31. Cholus cattleyae Champ. 



to prefer to rest in the curled, basal portion of the leaf, where a 

 considerable part of their feeding takes place. In New Jersey, 

 Dendrobium findlayanum and D. crystallinum seem to be attacked 

 more than other species. 



Cholus Gattleym Champ. (Fig. 31) 



This attractive species, which belongs to the Curculionidce, 

 is about 11 mm. long, 5 mm. wide, black and characteristically 

 marked with white, and has been found as a rule associated only 

 with Cattleya gigas, but other species are sometimes injured. It 

 feeds on the surface of the pseudo-bulb and punctures the leaves 

 with large holes, the tissue surrounding these punctures finally 

 turning black and becoming hard and dead. The larval and pupal 



