. Bulletin of the Natural History Museum Geology. FOSSIL MAYFLY FROM BURMESE AMBER 27. Fig. 2 Myanmarella rossi gen. nov. sp. nov., holotype, , Burmese amber. Length of right fore wing C strongly arched; R and hind branch of anterior RS fork ending in thin fold not reaching outer margin, between hind branches of RS two very weak interrupted longitudinal veins are visible; between MA and IMA two fine folds are visible, the hind one forked, between IMA and MA2 one weak longitudinal vein; crossvenation restricted to basal and apical parts of wing. On the left forewing, fore margin
. Bulletin of the Natural History Museum Geology. FOSSIL MAYFLY FROM BURMESE AMBER 27. Fig. 2 Myanmarella rossi gen. nov. sp. nov., holotype, , Burmese amber. Length of right fore wing C strongly arched; R and hind branch of anterior RS fork ending in thin fold not reaching outer margin, between hind branches of RS two very weak interrupted longitudinal veins are visible; between MA and IMA two fine folds are visible, the hind one forked, between IMA and MA2 one weak longitudinal vein; crossvenation restricted to basal and apical parts of wing. On the left forewing, fore margin is crumpled at the base, in radial area a fine vein forks two times, one near wing base and another slightly proximal from wing midlength, a fine vein forks near the outer wing margin crosses IRS, between IRS and hind branch of RS no veins are visible; IMA weak, near MA a fine interrupted vein; behind CuP a fine curved vein well visible; crossvenation only at basal half of wing (about 10 veinlets). Hind wings pointed at apex, (right) to (left) times as long as wide, costal angulation widely rounded, longitudinal veins very fine. Venation of hind wings is also different: on the right wing one fork of RS with short intercalary well visible, base of SC not visible, subcostal area wide, R in its apical third attached by one fine crossvein, RS distally forking, MA and MP simple. On the left hind wing apex of SC is not visible, bases of R and M fused, there are several additional fine veins near main longitudi- nal one. Abdomen about twice as long as thorax. Cerci with long segments, the segment is three times as long as wide. Measurements. The length of fore wings: right - mm, left - mm, their width respectively - mm and mm; the length of hind wings: right - mm, left - mm. Discussion. The nymphs of living Prosopistomatidae inhabit ex- clusively running waters where they occur mostly on the underside of stones in rapid flows (Gillies, 1954; Pete
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