. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. The carabid beetles of New Guinea • Darlington 165 CO lij o UJ a. CO. UJ CD z 0-1- 2-3-4-5-6-7- 8-9-1011-12-13-14-15-16-17-18- SIZE CLASSES (EACH N N 95 MM) igure 9. Histogram of size distribution of Carabidae found at Dobodura. Explanotion as for Fig. 8, except hatched portions f columns represent ecologic groups: right-oblique hatching at bases of columns, hydrophiles; no hatching, mesophiles; nd left-oblique hatching at top of columns, arboreal forms. hows a single mode at a larger size—at ir near mm—than th
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. The carabid beetles of New Guinea • Darlington 165 CO lij o UJ a. CO. UJ CD z 0-1- 2-3-4-5-6-7- 8-9-1011-12-13-14-15-16-17-18- SIZE CLASSES (EACH N N 95 MM) igure 9. Histogram of size distribution of Carabidae found at Dobodura. Explanotion as for Fig. 8, except hatched portions f columns represent ecologic groups: right-oblique hatching at bases of columns, hydrophiles; no hatching, mesophiles; nd left-oblique hatching at top of columns, arboreal forms. hows a single mode at a larger size—at ir near mm—than the second mode •f the lowland species. Very few Tachys iccur in the mountains; their place in the listogram is represented by the hatched >art of the first column; and removal if Tachys from this histogram does not •hange it significantly. However, ants too ire relatively few at higher altitudes in 'Jew Guinea, and their fewness may have omething to do with the size distribution )f mountain-living Carabidae. In summary of the size of New Guinean Carabidae: all the characteristic ones are mall. The absence of large forms may )e due to a combination of (1) difficulty )f access, (2) the greater dispersibility of mall as compared with large Carabidae, md (3) the fact that the existing New Guinean carabid fauna is relatively recent n its origins and has not had time to ^volve large forms. Tlie lowland Carabidae of New Guinea have a bimodal size dis- tribution, with modes at and mm; this bimodality is due primarily to the presence of many small species of Tachys, but may also reflect an underlying relation with ants, which may compete with or prey on Carabidae especially in the 3 to 5 mm size classes. Mountain-living New Guinean Carabidae have a unimodal size distribution, with the mode at or near mm; l)oth Tachys and ants are relatively few in the mountains, and their absence may partly account for the dif- ferent size distribution of mountain-living
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