. The Australian zoologist. Zoology; Zoology; Zoology. FRASER. 159 Genera:—Mecistogaster Pseudostigma Selys, Microstigma Ramb., Anomisma McLach., Megaloprepus Ramb. (xi). Annectent form:—The family Pseudostigmatidae would appear as a very isolated group in any scheme of classification were it not for the exist- ence of the genus Thaumatoneura McLach., here placed in the family Megapodagriidae, but undoubtedly an annectent form connecting the latter with the Pseudostigmatidae. Calvert (1915) has shown that the larva of this genus is a waterfall dweller, and it seems possible that the cha
. The Australian zoologist. Zoology; Zoology; Zoology. FRASER. 159 Genera:—Mecistogaster Pseudostigma Selys, Microstigma Ramb., Anomisma McLach., Megaloprepus Ramb. (xi). Annectent form:—The family Pseudostigmatidae would appear as a very isolated group in any scheme of classification were it not for the exist- ence of the genus Thaumatoneura McLach., here placed in the family Megapodagriidae, but undoubtedly an annectent form connecting the latter with the Pseudostigmatidae. Calvert (1915) has shown that the larva of this genus is a waterfall dweller, and it seems possible that the change from a normal aquatic existence to one in water collected at the base of the leaves of epiphytic Bromeliads, may originally have been accomplished by way of waterfall dwelling? Thaumatoneura agrees with the Pseudostig- matidae in the proximity of the nodus to the wing-base and the correlated immense development of postnodals and of the cross-veins in general, dis- tal to the level of the arculus; it agrees with the Megapodagriidae in pos- sessing a well formed, normal pterostigma and in the strong development of intercalated sectors. While agreeing with Calvert in placing this form definitely within the family Megapodagriidae, I consider it so aberrant in a number of characters that I have no hesitation in forming a separate subfamily for it. Family 6. Megapodagriidae Till. (Figs. 21, 22.).. AlCuP Fig. 21. This family can be recognized at once by the following combination of characters:—Superior appendages of male forcipate; wings held either open widely or partly so when at rest; venation with a greater or less develop- ment of intercalated sectors; R4 + 5 never arising nearer the arculus than to subnodus (equidistant in Rhipidolestes, much nearer the subnodus in all other genera) ; discoidal cell always an elongated quadrilateral, its distal angle varying from acute (Rhinagrion, Megapodagrion) to subacute in most genera, rectangular in Thaumatoneura; 1R2 arising fro
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