304 



as many as 30,000 female moths caught on the band. Experiments 

 with substances that would act as repellents to the female moths, or 

 as insecticides to prevent them crossing the bands, were tried without 

 success. 



McCoNNELL (W. R.). Eupelminus saltator, Lindm., as a Parasite of 

 the Hessian Fly. — Jl. Econ. Entom.,Concord,N.H., xi, no. 2, April 

 1918, pp. 168-175. 



Another parasite, hitherto unrecorded in America, has recently 

 been reared from the Hessian fly [Mayetiola destructor]. It has been 

 identified as Eupelminus saltator, Lindm., and is probably identical 

 with the parasite reared from the galls of various species of Isosoma. 

 The facts concerning the life-history of this parasite are not yet 

 fully known, the biological data collected being based on laboratory 

 experiments during the season of 1916. ^ 



The species is probably wide- spread in Europe and was undoubtedly 

 introduced into America at an early date in infested straw. It has 

 been reared from Pennsylvania, Maryland, and Virginia, and from 

 Isosoma material in several other States. During these investigations 

 it has not been an abundant parasite of M. destructor, only 6'67 per 

 cent of the pupafia, at the most, being parasitised by it. 



E. saltator is a primary parasite of M. destructor, which it attacks 

 externally in both the larval and pupal stages. It may however 

 become a secondary parasite, since a puparium from which an indi- 

 vidual had emerged was opened and found to contain cocoons of 

 Polygnot'us, from one of which it had issued. It has also been reared 

 from the galls of several species of Isosoma {Harmolita), including 

 /. tritici, I. vaginicola, I. maculatum and /. alhomaculatum. 



The males are as yet unknown. The females, after emergence, 

 rest and feed for about 3 days before beginning oviposition, which may 

 extend over a period of about 24 days. One individual may lay 

 as many as 5 eggs a day to the aggregate number of at least 100, 

 oviposition occurring only during daylight and preferably in bright 

 weather. In two cascb, this species has been reared through 5 and 

 6 parthenogenetic generations. The eggs hatch in about 3 days and 

 the A^oung larvae attach themselves to the host by means of the 

 mandibles. The host dies within 2 or 3 days and the parasites slowly 

 absorbs the body contents, leaving nothing but the empty skin. The 

 larval and pupal stages occupy 8 to 12 days each, and it w^as found 

 possible to rear six generations in about a year, but in a comparatively 

 cool summer probably not more than three generations are produced. 

 It will be necessary to keep this parasite under observation for a series 

 of years before its real value can be correctly estimated. 



MoERiLL (A. W.). Experiments with Grasshopper Baits with Incidental 

 Observations on the Habits and Destructiveness of the Differential 

 Grasshopper {Melanoplus different ialis). — Jl. Econ. Entom., 

 Concord, N.H., xi, no. 2, April 1918, pp. 175-186. 



The poisoned bait experiments described in this paper on Mela- 

 noplus differentialis were carried out in lucerne fields where the grass- 

 hoppers were fairly evenly distributed, and at a time when practically 



