64 NEW YORK STATE MUSEUM 



vations of Dr Britton 1 , are deposited about the first week in May at 

 the distal end of the leaf stem or at the base of the blade at the point 

 where the chief veins branch from the stem. This leaf -stem borer 

 has been recorded as attacking sugar, Norway and Sycamore maples. 



The restriction of this leaf -stem borer to the lower branches would 

 make it comparatively easy to pick off the infested leaf stems about 

 mid- June and burn them; this might well be supplemented in the 

 case of trees standing on closely clipped lawns, by picking up the 

 infested stems as soon as they begin to fair in numbers and burning 

 them with the contained larvae. This work can be done to the 

 best advantage about the middle of June. It has also been suggested 

 that spraying the ground under infested trees at about this time 

 with a contact insecticide, such as kerosene emulsion, would doubtless 

 destroy many of the borers. The tobacco-soap preparation used 

 so generally against plant lice might be equally effective and less 

 injurious to lawns. 



Bleeding tree maggot (Mycetobia diver gens Walk.). 

 The exudation of sap and an accompanying discoloration of the 

 bark below, the latter caused in part probably by precipitates, 

 is more or less familiar to all conversant with trees, and is particularly 

 likely to occur on sugar maples and American elms, though the 

 Norway maple, birches and poplars are by no means exempt. Prof. 

 O. A. Johannsen 2 informs us that he has reared the above-named 

 species from peach gum as well as from bleeding elms and poplars, 

 and an earlier account of work by presumably the same species, 

 was given by the writer in 19 13 in the Journal of Economic Ento- 

 mology, 6:285-86, the species being provisionally referred to the 

 genus Ceratopogon. There may be a number of causes for this 

 trouble and yet, in an experience covering several years, we have 

 been able in most cases carefully examined, to find slender, white 

 maggots about one-fourth of an inch long and with brown heads, 

 in the deepest portions of the wounds. These maggots have well- 

 developed jaws and in "several instances they were observed at work 

 on the tender, bleeding tissues. It is our opinion that many of 

 these wounds with their unsightly effluent moistening the bark 

 below, are caused by the maggots of this species. 



A technical description of the larva, the pupa and a brief character- 

 ization of the adult is given below. 



1 Ent. News, 17:313-21,' 1906. 



2 See also Me. Agri. Exp. Stat. Bui. 172, p. 223-24, 1909; Bui. 177, p. 31-32, 

 1910; 111. State Lab. Nat. Hist. Bui. 11, art. 4, p. 321, 1915. 



