The characterization of four new transiting extrasolar planets is presented here . KOI-188b and KOI-195b are bloated hot Saturns , with orbital periods of 3.8 and 3.2 days , and masses of 0.25 and 0.34 M _ { \mathrm { Jup } } . They are located in the low-mass range of known transiting , giant planets . KOI-192b has a similar mass ( 0.29 M _ { \mathrm { Jup } } ) but a longer orbital period of 10.3 days . This places it in a domain where only a few planets are known . KOI-830b , finally , with a mass of 1.27 M _ { \mathrm { Jup } }  and a period of 3.5 days , is a typical hot Jupiter . The four planets have radii of 0.98 , 1.09 , 1.2 , and 1.08 R _ { \mathrm { Jup } } , respectively . We detected no significant eccentricity in any of the systems , while the accuracy of our data does not rule out possible moderate eccentricities . The four objects were first identified by the Kepler  Team as promising candidates from the photometry of the Kepler  satellite . We establish here their planetary nature thanks to the radial velocity follow-up we secured with the HARPS-N spectrograph at the Telescopio Nazionale Galileo . The combined analyses of the datasets allow us to fully characterize the four planetary systems . These new objects increase the number of well-characterized exoplanets for statistics , and provide new targets for individual follow-up studies . The pre-screening we performed with the SOPHIE spectrograph at the Observatoire de Haute-Provence as part of that study also allowed us to conclude that a fifth candidate , KOI-219.01 , is not a planet but is instead a false positive Table LABEL : PriorTable is available only in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( 130.79.128.5 ) or via http : //cdsweb.u-strasbg.fr/cgi-bin/qcat ? J/A+A/ . CDS also includes the radial velocities given in Tables LABEL : table_rv_sophie and LABEL : table_rv . .