La chicharra, Spanish for ‘‘cicada,’’trills with not one but two rolling r’slike the charlado who won’t stoptalking because he has too much to say. Fallen dead on the sidewalk, though,his song is hushed, a shell emptied out,carapace of silence, once a chorus,lacelike wings enfolded, mute supplicant. Shell fired in terra cotta, ashen undercarriage,pale green wing …