516 



mustard {Brassica arvensis), cinquefoil {Poteniilla canadensis), white 

 clover [Trifolium repens), foxtail {Setaria glauca), and in one instance 

 on soy beans {Glycine hispida), the latter having been planted on 

 clover sod. 



A small percentage of the larvae was found to be parasitised. 

 Lead arsenate 2 lb. to 50 U.S. gals, water gave complete control in 

 fields of young sweet clover. 



Frost (S. W.). Ecdysis in Tmetocera ocellana, Schiff. — Ann. Ent. 

 Soc. Amer., Columbus, Ohio, xv, no. 2, June, 1922, pp. 164-168, 

 1 fig. 

 An account is given of the moulting of the larva of Eucosma {Tmeto- 

 cera) ocellana, Schiff., about which very little has been previously 

 published. 



Larrimer (W. H.). U.S. Bur. Ent. An Extreme Case of delayed Fall 

 Emergence of Hessian Fly {Phytophaga destructor. Say). — Ann. 

 Ent. Soc. Amer., Columbus, Ohio, xv, no. 2, June 1922, pp. 177- 

 180, 3 figs. 



Some interesting observations were made on the emergence of the 

 Hessian fly, Mayetiola {Phytophaga) destructor, Say, in the northern 

 part of the east central United States, following an unusual season 

 from June to September, when the mean temperature was from 3- 

 6° below normal, and during September and October, when it was 

 from 6-10° above normal, rainfall being more or less general but 

 varying remarkably. The effect of these conditions is shown by means 

 of graphs. From records made at Indiana and compared with others 

 from Illinois it was determined that the emergence of the " late wave " 

 occurred in the reverse order to the normal, that is, it occurred earlier 

 instead of later to the southward. From the latitude of Cincinnati 

 southward the dates of emergence come within the recommended 

 period for safe sowing and can be considered as normal. 



It was noticed in the course of these observations that about 40 per 

 cent, of the larvae produced at the beginning of the period did not 

 pupate at the normal time {i.e., about 11th October), but passed the 

 winter in old summer stubble. Pupation of these larvae took place 

 in the following spring, while those larvae arising from the normal 

 emergence of the preceding autumn pupated at approximately the 

 same dates, so that emergence of the adults was practically simultaneous 

 in the spring. 



FoLSOM (J. W.). Pollination of Red Clover by Tetralonia and Melis- 

 sodes. — Ann. Ent. Soc. Amer., Columbus, Ohio, xv, no. 2, June 

 1922, pp. 181-184. 



Observations and experiments .are described which prove that the 

 bees, Tetralonia dilecta. Cress., and Melissodes bimaculata, Lep., pollinate 

 red clover to an important extent— the former in late May and June 

 (in Central Illinois) and the latter during July. 



Griswold (G. H.). Are there two Species of the Oyster-shell Scale ?— 



Ann. Ent. Soc. Amer., Columbus, Ohio, xv, no. 2, June 1922, 

 pp. 184-191, 4 figs. 



Lepidosaphes idmi, L. (oyster-shell scale) has been studied for the 

 past three years, with the result that three distinct differences have 



