NEW YORK STATE MUSEUM 77 



about 3 mm. and apically with about ten rather long, radiating 

 hairs. Mouth structures apparently represented by six long, Par- 

 ticulate fleshy processes. First segment small, the second moder- 

 ately large and with a suggestion of a rounded ventral sclerite, the 

 third to sixth segments with distinct prolegs on the ventral surface. 

 The other segments apodous, the posterior extremity broadly 

 rounded. 



SHADE TREE INSECTS 



Elm ribbed cocoon-maker ( Bucculatrix species, not 

 ul m e 1 1 a Zell.). Larvae and pseudococoons of this species, kindly 

 passed upon by Mr Busck through the courtesy of Doctor How- 

 ard, were received under date of July 8, 1919, from John Dunbar, 

 assistant superintendent of parks, Rochester, accompanied by the 

 statement that the insect was rather seriously injuring European 

 elms. The young larvae eat away irregular, somewhat angular 

 areas on the under side of the leaves, never crossing the principal 

 veins. The boundaries of the work were also invariably determined 

 by the veinlets. The larvae very frequently fed along one of the 

 lateral veins for a distance of one-fourth or nearly one-half of an 

 inch, the width of the skeletonized area being about one-eighth of 

 an inch. The characteristic small whitish pseudococoons, presum- 

 ably molting cocoons, were found here and there upon the foliage. 

 These were approximately oval or circular in outline and had a 

 diameter of two to 2.5 mm. 



A description of the presumably partly grown larva is as follows : 



Larva. Probably partly grown. Length 4 mm, rather slender, 

 a pale grayish green, the head light brown, the thoracic shield pale 

 yellowish, it and the body with sparse, moderately long, dark setae, 

 those on the thoracic segments forming a nearly transverse row, 

 with two submedian ones near the posterior third of the segment. 

 True legs and prolegs pale yellowish. 



The full-grown larvae constructed the characteristic ribbed 

 cocoons of Bucculatrix, they differing from those of our native 

 apple and birch species by being grayish black. Adults were reared 

 July 14th. 



This is probably another introduced species. It may become 

 extremely abundant here and there though the rearing at Washing- 

 ton of parasites, namely Copidosoma sp. and C i r r o - 

 s p i 1 u s sp., indicates that natural enemies either native or foreign 

 are preying upon this insect and may serve to keep it under control 

 fairly well. 



Should the elm Bucculatrix become exceedingly abundant we 

 would advise spraying with a poison early in July, taking special 



