282 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



tion, and therefore only control measures were put into effect. These 

 consisted of a careful inspection in summer and collecting all larvae 

 found; thoroughly spraying with lead arsenate all trees infested; 

 another careful inspection in late fall and early winter to gather all 

 cocoons from the twigs. 



The insectary records were kept by my assistant, Mr. M. P. Zappe, 

 to whom I am indebted for some of the data included in this paper. 



During 1915, two complete generations were reared and a number 

 of males of the third generation emerged late in the fall. Possibly 

 another year we may be able to obtain three complete broods, because 

 on account of an accident some of the first second-brood larvse died. 

 The broods overlap and are rather irregular. Some of the over- 

 wintering pupae did not produce adults until after the first generation 

 of larvse had matured. If the needles became dry, as is sometimes 

 the case with cut twigs, the eggs failed to hatch. Unfertilized eggs 

 hatched, and the larvse developed normally to the pupal stage, in 

 which condition they are now passing the winter. 



The average length of the larval stage appears to be about thirty 

 and one-half days. 



In Connecticut Di-prion simile feeds upon the white pine, Pinus 

 strobus; the Austrian pine, P. laricio var. austriaca; the Japanese or 

 Bhotan pine, P. excelsa; the Scotch pine, P. sylvestris; the mugho 

 pine, P. montana; P. flexilis and P. densiflora. All newly-hatched 

 larvse died when fed on Austrian pine, but after the first instar they 

 were able to finish their subsequent development upon this food plant. 

 Probably when in need of food this sawfly may attack almost any 

 kind of pine and possibly other conifers. 



There is some consolation in learning that Diprion simile is highly 

 parasitized, and of the parasites which have been reared up to this 

 time, all are native American species; I am indebted to Mr. S. A. 

 Rohwer of the Bureau of Entomology for their identification. Of 

 152 over-wintering cocoons, 46, or about 31 per cent, were parasitized 

 by the Chalcid fly Pachyneuron (Dihrachys) nigrocyaneus Norton. 

 One specimen each of Hemiteles utilis Norton, and a species of Ceram- 

 hycobius were obtained. Tachinid eggs are not uncommon upon the 

 larvse and Exorista petiolata Coquillett was reared from the cocoons. 



APIARY INVESTIGATIONS IN MISSOURI 



By L. Haseman, Columbia, Mo. 



In the past few years the writer has felt the growing need and 

 demand on the part of farmers and beekeepers for help along beekeep- 

 ing lines. The state agricultural colleges for years have been teaching 



