55 



WorJc of (he season, H. Osborn (pp. 57-02). — Notes on the following,' 

 insects obst'iVLMl in Fowa in IS'JO: Cramhiis c.isiccddt.s, leaf li()p|)ers 

 ('/(tssithr), j^rasslioppcr.s and crickets in j;rass, I'cntpclia liammondii, 

 Papilio tunius, ISclandria cerasi, Datana ministra, Diabrotica longicornis, 

 l>. vittafa, 1). 12i)UHctat(i, Lophyrus abbotii, and Trichobaris trlnotatns. 

 The last two are new to the State. Snccessful tests of arsenite of 

 aniinouia as an insecticide are also rei)orted. 



Some of the insects al]'ectiii(j cereal crops, F. M. Webster (pj). 03-79). — 

 This relates largely to experiments and observations during more than 

 G years, with reference to the nnmboraiid develoi)inent of broods of the 

 Hessian tly, chietiy in Indiana. It was foniul that thronghout Indiana 

 this insect is donble-brooded. The article also contains observations 

 on theelfect of the larva' on the plants, esi)ecially on the color, and on 

 the eflect of the weather in the development of the full brood, together 

 with a rcsum6 of preventive and remedial measures. 



Bulletin No. 25. 



Destructive locusts, C. V. IUley (pp. 02, plates 12, figs. 11). — 

 A popular accouutof the geographical distribution, destructive appear- 

 ances, life history, and habits of the following si)eeies of injurious 

 locusts found in the United States : Rocky Mountain locust {Caloptcnus 

 spretus), lesser migratory locust (C. atlantis), nonniigrating red-legged 

 locust {C./emur-rubrum), California devastating locust (C. devastator), 

 differential locust [C. diU'crcntialis), two-striped locust {C bivittati(s), 

 pellucid locust {Camnula peUucida), and American acridium {Schistocerca 

 americana). The remedies and devices for the destruction of locusts 

 are described and discussed. The bulletin is illustrated with a mafiof 

 the United States, showing the distribution of the Kocky Mountain 

 locust, and various kinds of api)aratus used in the repression of locusts 

 are shown. 



Circular No. 2 (Second Series), June, 1801. 



The nop plant louse (pp. 7, plate 1, figs. 5).— A popular account of 

 the life liistory of Phorodon humuli, with suggestions regarding reme- 

 dies, and descriptions of spraying apparatus, prepared in view of the 

 appearance of this insect in alarming numbers in New York, Oregon, 

 and Washiugtou. Reference is matle to the record of investigations of 

 this insect in the Annual Report of this Department for 1888. The 

 remedies recommended are, (1) spraying with kerosene emulsion or fish- 

 oil soap in the spring, or preferably in the fall after ho[) picking; (2) 

 the destruction of all wild plum trees in the hop-growing regions; (■>) 

 the burning or drenching of the hop vines with kerosene emulsion soon 

 after the crop is harvested. 



