Smithsonian miscellaneous collections . On the other hand,Fraser (1944) stated that IR3 never originated from a basal sourcebut extended inwards from a peripherial one. The media (MA) is a simple vein extending from the arculus tothe apical third or fourth of the posterior margin of the wing. It iscalled by Lameere (1922) and Tillyard (1926) anterior median(MA). Its basal portion forms the anterior border of the hyper-triangle (h). The posterior cubitus (CuP) is a crooked vein. It extends fromthe base of the wing to a point beyond the arculus and then bendsabruptly posteriorly almost at a righ
Smithsonian miscellaneous collections . On the other hand,Fraser (1944) stated that IR3 never originated from a basal sourcebut extended inwards from a peripherial one. The media (MA) is a simple vein extending from the arculus tothe apical third or fourth of the posterior margin of the wing. It iscalled by Lameere (1922) and Tillyard (1926) anterior median(MA). Its basal portion forms the anterior border of the hyper-triangle (h). The posterior cubitus (CuP) is a crooked vein. It extends fromthe base of the wing to a point beyond the arculus and then bendsabruptly posteriorly almost at a right angle, forming the common sideof the triangle (t) and the subtriangle (s). From the posterior apexof the triangle CuP extends to a point slightly beyond or basal to themiddle of the posterior margin of the fore and hind wings respec-tively. Lameere called this vein the posterior branch of cubitus (CuP),and in this has been generally followed by subsequent authors on NO. 6 MORPHOLOGY OF THE DRAGONFLY—CHAO 33 ^ Ax, arc A*2 p-fc. IR31IND WING,c? tmmX M r STERNITE II, 9 „ PTC SUTC S7*P — T SUTC 1 \ T 33 BASAL SEGMENTS - DORSAL VIEW,9 STN SUTC PTC ?UTC 37
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
