35 



raost catalpa trees to dislodge the nearly grown worms 

 by jarring. By suddenly shaking a limb they could be 

 made to drop like ripened fruit, and could then be 

 quickly destroyed. In a few moments on one occasion I 

 removed in this way every worm from a tree, to the 

 number of not less than a hundred and fifty. 



A CATALPA SPHINX PARASITE. 



The worms are parasitized by a fly which places its eggs on their 

 skins giving rise to grubs which bore into and live upon their tissues. 

 The adult flies emerge after the catalpa sphinx has pupated in the 

 g round. 



The fly measures .31-. 37 inch in length, is gray, with black mark- 

 ings, of which the more conspicuous are four narrow longitudinal 

 lines on the thorax, and cross bands occupying the hind portion of 

 the divisions of the abdomen. The face is silvery, the eyes reddish 

 .brown, the legs black, excepting the outside of the front thighs which 

 .are whitish. The whole body is protected by numerous strong black 

 hairs these being especially well developed on the head above, and at 

 the tip of the abdomen where they form a sort of brush. It does not 

 seem to be common enough^ to help greatly in keeping the worms 

 from mischief, but like other parasites may serve a useful purpose 

 ■when its hosts become extraordinarily abundant. From more than a 

 hundred worms kept at the Station during the summer of 1893 only 

 four examples of the parasitic fly were obtained. Two of these 

 emerged July 17, another on July 18, and the other, July 20. 



The Walnut Caterpillar. 



{Datana integerrima) . 

 Walnut trees while not making the best of shade are 

 frequently spared when growing about sites selected for 

 dwellings. Their value in this situation is greatly 

 diminished here in Kentucky by the attacks of a cater- 

 pillar on the leaves. It is no uncommon thing to see 

 large trees 50-60 feet in height almost completely de- 

 prived of foliage in the latter part of summer by these 

 -caterpillars. In addition to destroying the leaves they 

 make themselves very annoying by throwing down refuse 

 and by overrunning walks and buildings in the neighbor- 



