. The Australian zoologist. Zoology; Zoology; Zoology. 158 A RECLASSIFICATION OF THE ORDER ODONATA. third of 1R3 and the greater portion of MA. The pterostigma is consider- ably longer than wide; discoidal cell an elongate rectangle. The superior anal appendages of the male are forcipate. Only a single genus, Lestoidea Till. This peculiar form combines the characters found in three different families. The great reduction of the main veins CuP and 1A is reminiscent of the Protoneuridae, the positions of the origins of 1R3 and R4 + 5 re- semble those in the Lestidae, and the presence of straight
. The Australian zoologist. Zoology; Zoology; Zoology. 158 A RECLASSIFICATION OF THE ORDER ODONATA. third of 1R3 and the greater portion of MA. The pterostigma is consider- ably longer than wide; discoidal cell an elongate rectangle. The superior anal appendages of the male are forcipate. Only a single genus, Lestoidea Till. This peculiar form combines the characters found in three different families. The great reduction of the main veins CuP and 1A is reminiscent of the Protoneuridae, the positions of the origins of 1R3 and R4 + 5 re- semble those in the Lestidae, and the presence of straight intercalated sectors between R2, 1R2 and R3 reminds one of the Megapodagriidae. Lestoidea, however, differs from all known Megapodagriidae, and indeed, from all other Zygoptera, in that these intercalated sectors are carried right through from the wing border to the main stem of R2, so that they exactly resemble in their structure, the vein 1R2 itself. Family 5. Pseudostigmatidae no v. fam. (Fig. 20.).. Fig. 20. AtduP HA Division Pseudostigmatina Kirby, 1890, p. 119. Subfamily Pseudostigmatinae Munz, 1919, Mem. Amer. Ent. Soc. 3: 20. This peculiar and, in some respects, aberrant group can be easily re- cognized by three important venational characters, viz. (1) the nodus is placed very close to the wing base, , from one-fifth to one-sixth of the total length of the wing (, however Thaumatoneura, an annectent genus between this family and the Megapodagriidae), (2) there is an enormous increase in the number of postnodals and generally in the cross-vein system of the whole wing distally from the nodus, and (3) the pterostigma is either absent or extremely aberrant in form, ranging from a group of darkened but not particularly chitinized cells (Mecistog aster, Megaloprepus) down to a single minute cell in Microstigma, and a complete loss of the structure in Anomisma. Other venational characters are:—1R3 arising at the subnodus, R4 + 5 a little before it; 1R2 arising fro
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