. African invertebrates : a journal of biodiversity research. Invertebrates -- Africa; Biological diversity -- Africa; Biological diversity. DEVELOFMKNT OF 'I'HP] OF TERMITES. 269 common to the imago. Fig. 6, f, of the series represents the XIX expression of the major soldier. Botli the XVIII [g, h) are derived from the XIX by a (15 + li) union, whilst the XYIII (0 is due to a (III+ 16) union. The XVII (./) is due to two unions, a (15 + 14) accompanied by a (111 + 16). The Homologies.—These are set out in fig. 6, k~t. All the figures employed are from camera-lucida sketches, but are
. African invertebrates : a journal of biodiversity research. Invertebrates -- Africa; Biological diversity -- Africa; Biological diversity. DEVELOFMKNT OF 'I'HP] OF TERMITES. 269 common to the imago. Fig. 6, f, of the series represents the XIX expression of the major soldier. Botli the XVIII [g, h) are derived from the XIX by a (15 + li) union, whilst the XYIII (0 is due to a (III+ 16) union. The XVII (./) is due to two unions, a (15 + 14) accompanied by a (111 + 16). The Homologies.—These are set out in fig. 6, k~t. All the figures employed are from camera-lucida sketches, but are not absolutely in proportion. With the exception of the antennse of the minor workers it), all represent the same degree of development—that is, the flagellum of each con- tains the same quota of joint-elements, namely twenty-one. In the flagellum of the ininor worker there are, however, only 19 elements. The main point of difference between the antennae of the major Avorker and imago is that in one there is a constant (15 + 14) union which is always absent from the latter. The main points of agreement between the organs of the major Avorker and major soldier lie in the frequency of the (15 + 14) union in the soldier organ and the peculiarly attenuate nature of (13) and (12) in both. The XVII expression of the major soldier (fig. 6, r) is quite uncommon, but homologises Avith the constant XVII of the minor soldier (.§), as a compai'ison of the two sketches shoAvs. The antenna3 of the minor woi"kers, as represented by {t), shoAv their curtailment by the absence of (16) and (17). In a feAv cases they must be regarded as XVIII-jointed as (14) and (15) are practically independent joints. Development.—The natal condition of the antenna is as represented by stage C (PI. XV), in which III is in a bilocular phase. This seems common to all undifferentiated larvas at the beginning of the first instar. Imago.—The antennte developing along the main route C to M become XlX-jo
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