186 



these two hosts at regular intervals ; for example, Rhopalosiphum 

 nympheae, L., lives in winter and spring on the plum and in summer 

 on various water plants. 



Certain individuals among plants appear to be immune to attack, 

 although growing by the side of heavily infested plants. Owing to 

 the great variability in the behaviour of the migrants, repeated tests 

 are necessary before data can be definitely established. As a rule, it is 

 simpler to work with the progeny of the spring migrants than with 

 the autumn return forms, since the proof of the validity of a tested 

 food-plant rests on the ability of the offspring of the migrants to develop 

 on it. 



Whitmarsh (E,. D.), Life-History Notes on Apateticus cymcus and 

 maculiventris.^Jl. Econ. Entom., Concord, ix, no. 1, February 

 1916, pp. 51-53. 



The Pentatomid, Apateticus cynicus, Say, the most common of the 

 predaceous brown stink-bugs, is single-brooded. Eggs are deposited 

 in late autumn in masses containing about 45 eggs. Young emerge 

 between the middle of April and the middle of May, and under favour- 

 able conditions reach maturity in about six weeks. Pairing occurs 

 about three weeks after the adult stage is reached and is continued at 

 intervals throughout the summer. Males begin to die off at the 

 beginning of September, while the females live for some weeks longer 

 .and deposit eggs. From the time the second instar is reached, the 

 insect is predaceous upon unprotected individuals of its own species 

 and upon Lepidopterous larvae, such as those of Datana integerrima, 

 D. ministra, D. angusi, Halisidota caryae and Callosamia promethea. 



A. maculiventris, Say, begins to oviposit during the latter part of 

 May or early June ; each egg-mass contains from 20 to 30 eggs. 

 Larvae hatch out in three days and feed during early life on Aphids 

 and newly-hatched larvae of beetles, moths and butterflies. They 

 exhibit a marked dislike for hairy caterpillars. Later, the food consists 

 of the larval forms of the elm leaf beetle [Galerucella luteola], the potato 

 beetle [Leptinotarsa decetnlineata], etc. The winter is passed in the 

 adult stage in a sheltered place. 



[Gossaed (H. a.). The Distribution of the Periodical Cicada in Ohio. 

 ■ — Jl. Econ. Entom., Concord, ix, no. 1, February 1916, pp. 53-59, 

 4 figs., 1 table. 

 The distribution of the periodical cicada [Tibicen septemdecim] in 

 Ohio in 1906, 1914 and 1915 is illustrated by maps. In the 1914 

 report the first records were as early from the northern as from the 

 southern parts of the State, but the dates of disappearance were 

 progressively later, going towards the north. It is probable chat the 

 insects are thinly distributed in the western counties, outside the 

 territory hitherto regarded as inhabited by the brood. Pupae were 

 collected at Wooster during the last 10 days in April and adults were 

 recorded on 25th May. Oviposition began on 5th or 6th June. The 

 map for 1915 was constructed from 227 reports, of which 38 affirmed 

 the presence of the insect in small numbers. In Mahoning county 

 larvae were numerous in the upper layers of the soil in April and May, 

 but did not appear in large numbers as adults. 



