Chorthippus (Glyptobothrus) jacobsi Harz, 1975

The male calling song and taxonomic measurements were presented by Ragge & Reynolds (1988), showing that the species is closely related to C. (G.) brunneus which is distributed in central europe beyond the pyr- enees and in italy, as a special form. fig. 10 presents some echemes of the portuguese males. The male calling song is a sequence of usually 5-8 short echemes, each lasting for about 0.5s. The echemes usually consist of 5 syllables without recognisable intervals, but a short gap appears before the ending of the downstroke. up- and downstrokes are not clearly sepa- rated ( g. 10), as found in indivuals from Sierra Nevada (Schmidt 1999).
similarly to what happens between the related species, C. (G.) brun- neus, and C. (G.) jacobsi, which are sympatric in the Pyrenees, rival- ry singing between two males often takes place, as shown in  g. 11. In such songs the echemes are shorter than in the male calling songs. in the present case, the males alternatedf at intervals of 1 s. [1]

References