1923 ENTOMOLOGICAL SOCIETY. 75 



To these records we may now add those reared from turnips at Ottawa, 

 which became adult on August 21st and 22nd, 1922, after a puparium stage of 

 approximately seventeen days. 



In Europe, reports of injury from this species apparently are common. 

 Young cucumber vines, beans, asparagus and seed potatoes are recorded as 

 being injured. In America the seed potato seems to be most commonly attacked, 

 hence the name. 



Johanssen, in the former reference, states that the species is "widely dis- 

 tributed," but reports of injury to crops are rare and very little is known of 

 the life-history in America. 



Females of H. cilicrura and H. trichodactyla are difficult to distinguish, but 

 the males may be separated by the armature of the middle tarsus, which in the 

 latter species has a few long bristly hairs on the upper (extensor) side of basal 

 segment. 



The larval characters, of which an account is given by Johanssen, show the 

 close relationship of this species to H. cilicrura, H. brassicce and H. antiqua; 

 but from the structure of the mouth hooks H. trichodactyla is probably more 

 closely allied to H. brassicce than the others. 



