Synthetic long-range (high-frequency) Pn phases that fit both the arrival times and, more importantly, the characteristic long coda duration of this phase are generated using a velocity-depth model consistent with long-range refraction and surface wave observations. These synthetics show that a crustal guided-wave plays an important part in the character of ''typical'' long-range Pn coda; in particular, the largest amplitude arrivals at ranges greater than about 8¿ propagate through the crustal wave guide. Comparison of a synthetic long-range Pn signal with an observation of this phase at 8¿ range suggests that any P-velocity inversion at the base of the lithosphere must be small. This result is consistent with the anomalously high Q values for Sn reported by Walker et al. [1978> since a P-velocity inversion much smaller than the associated S-velocity inversion means that tuneling would extract much more low-frequency energy from long-range Sn than it would from long-range Pn.