| |(2950 |(116-135)|(0.07 |(0.04 | (396-477) | | -3600)| | -0.09)| -0.07)| ----------------+--+---------+---------+---------+---------+-------------- The two subspecies of _H. microcephala_ agree closely in fundamental frequency. There is considerable overlap, but the difference between the means is significant at the 0.001 level of probability (t = 4.2406). The call of _H. robertmertensi_ does not overlap that of _H. sartori_ or either subspecies of _H. microcephala_ in this parameter; but it does overlap that of _H. phlebodes_, although again the difference between the means is significant at the 0.001 level (t = 9.360). _Hyla phlebodes_ and _sartori_ have the lowest fundamental frequencies, and there is some overlap, but here too the difference between the means is significant at the 0.001 level (t = 4.923). _Dominant frequency._--A dominant band of frequencies cuts across the harmonics of the fundamental, obscuring the harmonic pattern and generally shifting upward in frequency. The midpoint of this band is measured at the terminal border as the dominant frequency. As with the fundamental frequency, only the normal primary notes were utilized in the comparisons (Table 5, Fig 8). [Illustration: Fig. 7. Variation in the fundamental frequency of the normal primary notes in the _Hyla microcephala_ group. The horizontal lines = range of variation, vertical lines = mean, solid bars = twice the standard error of the mean, and open bars = one standard deviation. The number of specimens in each sample is indicated in parentheses after the name of the taxon.] The two subspecies of _H. microcephala_ agree more closely in this parameter than in fundamental frequency. The overlap is great, but the difference between the means is significant at the 0.001 level (t = 3.658). The calls of both subspecies completely overlap that of _robertmertensi_ in this parameter, but the difference between the means is significant at the 0.001 level. The calls of _H. phlebodes_ and _H. sartori_ overlap considerably in this characteristic, although the difference between the means is significant at the 0.001 level (t = 7.504) (Fig. 9). The call of neither species overlaps those of _H. microcephala_ and _robertmertensi_. [Illustration: Fig. 8. Variation in the mid-point of the dominant frequency band of the normal primary notes in the _Hyla microcephala_ group. The horizontal lines = range of variation, vertical lines = mean, solid bars = twice the standard error of the mean, and open bars = one standard deviation. The number of specimens in each sample is indicated in parentheses after the name of the taxon.] [Illustration: Fig. 9. Scatter diagram relating the dominant and fundamental frequencies of the normal primary notes in the _Hyla microcephala_ group. Each symbol represents a different individual.]