. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 34.—Apex of left mandible of : a, Bethalus ; b, Cubaris; showing in the one case a single free penicil, and in the other several penicils. regards the head and mandible, but has an unusually narrow pro- notum. It seems to me that the characters of the head and mandible are likely to be of greater phylogenetic significance than the width of the pronotum, in which there is every gradation from the very narrow, almost " linear " form ( officinalis, formicarum), to the very broad form
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 34.—Apex of left mandible of : a, Bethalus ; b, Cubaris; showing in the one case a single free penicil, and in the other several penicils. regards the head and mandible, but has an unusually narrow pro- notum. It seems to me that the characters of the head and mandible are likely to be of greater phylogenetic significance than the width of the pronotum, in which there is every gradation from the very narrow, almost " linear " form ( officinalis, formicarum), to the very broad form (secutor, aenigma) occupying one-quarter or even one-third of the dorsal length of the segment (see fig. 75, e). In the following key, therefore, the importance of the pronotum is subordinated to the characters of the head and the mandible. The character of the epimeron of the 1st peraeon segment also shows so many transitions from the typical Bethalus type (thin, expanded, with small, more or less rudimentary internal tooth) to that of Diploexochus (more or less thickened, with the outer margin of the internal tooth continued forwards as a raised line or ridge, thus forming a more or less extensive groove between it and the actual margin), that hard and fast divisions are not possible (cf, , the figures of limbatus, barbertoni, macrodens, aenigma, nigricans, orphanus). The subdivision of the old " Cubaris " complex is therefore still. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
