(,J4 (OWA ACADF-MV OF SCIKNCKS. 



Iowa. Tlie more iniportuiit facts orathercd durinof the past 

 siminier IxMrins^ u[)oii this subject were: 



Kcro- lavin."" began about the '2')th of May and practically 

 ceased l)y the last of June. Eijgs began again to be depos- 

 ited in considerable num!)ers about the 20th of July. Un- 

 hatched eggs were found constantly from July 22 to August 

 22. The number of efr<y6 laid after July 20, on trees where 

 counts were made, was over one-fifth as great as the number 

 laid before that date. The beetles reared from early stung 

 plums l>egan appearing in tlu^ breeding cages as early as 

 July 22. l^eetles were seen pairing July 22. The eggs of 

 the late punctures hatch as well as any and the larvii? develojk 

 in the plums. 



ON THE DISTRIBUTION OF CERTAIN HEMIPTERA. 



BY PROF. HERBF.RT (ISHORN. 



The Hennptera present some instructing cases of special 

 distribution, a few of which are considered. The relation of 

 the distribution to distribution of food plants is discussed and 

 cases cited where there is apparently entire independence of 

 climate, latitude, altitude, etc. For several of the species 

 localities are recorded which extend the range of the species 

 as heretofore known. The species mentioned more particu- 

 larly are: Anasa armigera, Alydns jnlosulns, L(qjtocorifi tri- 

 mttatm (recorded for eastern Iowa), Macrocohus coagulatiis, 

 Emhletlds arenarius, Calocoris rapidus. Pygolamjns peetoraUft, 

 Me la iwcoryj) // ?/.<>• h n-rva's . 



ON THE WAX GLANDS OF THE PEMPHIGINiE. 



MY PROF, HKRBKRl OSBORN. 



After considering the accepted ideas concerning the wax 

 ands of the ('occida^ and Aphid(t\ the i)a])er descriljes the 



