1909.] The Insect and Allied Pests of the Hop. 565 



Linn.), and earlier in the season those of the Gold Tail Moth 

 (Porthesia similis, Fues). 



The Snout Moth (Hypena rostralis, Linn.) also occurs 

 in small numbers. I have only once been able to find it 

 on hops in Kent, but Miss Ormerod includes it amongst the 

 hop pests in her Manual of Injurious Insects, saying, "The 

 caterpillars of this moth injure the hop by feeding on the 

 leaves." They are pale green in colour, with clearer spots, 

 and a whitish line on the sides and back ; slender in shape, 

 and gradually smaller towards the head, and have only- 

 three pairs of sucker feet. 



The Strig Maggot. 

 (Diplosis humuli, nov. sp.) 



In Kent, Hampshire, and Worcester hops are sometimes 

 attacked by the larvae of a small midge, a Diplosis — related 

 to the Pear Midge. It occurs, or has been recorded, near 

 Canterbury, Maidstone, Gravesend, Sevenoaks, various 

 places in the Weald, Selling, at Alton in Hampshire, and at 

 Tenbury in Worcestershire. 



These maggots do a considerable amount of harm, and,, 

 although the attack is not general, it is usually very severe 

 where it does occur. Generally isolated patches are attacked 

 in a garden at first, but if left the midge will spread over 

 the whole garden. The damage is done by the small white 

 footless maggots tunnelling up the stem or strig of the 

 hop cone, which is destroyed, and the central area of the 

 cone becomes a dark mass, and the bracts fall off or turn, 

 brown. The injury is shown in PI. III., Figs. 1, 3, and 4,. 

 normal cones being shown for comparison in Fig. 2. 

 As many as fifty of these maggots may sometimes be 

 found in one cone. Specimens received on August 31st 

 of this year showed the maggots in all stages, some yery 

 small, some nearly full grown. Miss Ormerod records them 

 from Wateringbury as late as September 10th. It is probable 

 that they mature between the last week in August and the 

 middle of September. Miss Ormerod records that in 1883 

 all had gone by September 27th at Sevenoaks. 



Like all maggots of the genus Diplosis, they have the 

 power of jumping into the air, and in this way, as the cones 



