. Blood-sucking mosquitoes of the subtribe Culisetina (Diptera, Culicidae) in world fauna. Mosquitoes. 98 Even the differentiation of 4th instar larvae poses no difficulty. In all members of the subtribe Culisetina, except A. longiareolata, there is an annular ring completely surrounding the anal segment (Fig. 53 and Table 4). In the 4th instar larvae of Culisetina, all the skeletal structures and such structures as the comb of segment VIII (Fig. 54), siphon crest and others are highly developed (Table 4). The increasing differentiation of the ventral brush in the course of 78 stadium-wise tra
. Blood-sucking mosquitoes of the subtribe Culisetina (Diptera, Culicidae) in world fauna. Mosquitoes. 98 Even the differentiation of 4th instar larvae poses no difficulty. In all members of the subtribe Culisetina, except A. longiareolata, there is an annular ring completely surrounding the anal segment (Fig. 53 and Table 4). In the 4th instar larvae of Culisetina, all the skeletal structures and such structures as the comb of segment VIII (Fig. 54), siphon crest and others are highly developed (Table 4). The increasing differentiation of the ventral brush in the course of 78 stadium-wise transformations is interesting. It is absent in the 1st instar larvae and later an increase in the number of setae set on the common base was apparent from stadium to stadium; simultane- ously, there is a reduction in the number of setae set anteriorly to the common base of the ventral brush (Table 4). The differentiation of the 2nd and 3rd larval instars usually poses the greatest difficulty. For this purpose, the variational series were compared and Fisher's reliability criteria calculated for most morphological factors studied. The results of these investigations (Maslov, 1963) suggest that the absolute body dimensions (head and siphon length) in all six species studied represent a good differential and diagnostic feature permitting the differentiation of the 2nd and. 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 Maslov, A. V; Ward, Ronald A. Washington : Smithsonian Institution Libraries : National Science Foundation
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