. Biological series. Biology. 12 Walker: North American Species of Aeshna hamular processes assume highly speciaUzed forms and be- come partly or entirely separate from the folds, which are in such cases more or less reduced (fig. 2, B). Both of these structures differ greatly in form in different species and are of great systematic importance. Immediately in front of the anterior hamuli is the an- terior lamina {al), a large plate, deeply but broadly cleft in the line, the cleft forming the anterior termination of the genital fossa. The anterior lamJna bears on each side at or near th
. Biological series. Biology. 12 Walker: North American Species of Aeshna hamular processes assume highly speciaUzed forms and be- come partly or entirely separate from the folds, which are in such cases more or less reduced (fig. 2, B). Both of these structures differ greatly in form in different species and are of great systematic importance. Immediately in front of the anterior hamuli is the an- terior lamina {al), a large plate, deeply but broadly cleft in the line, the cleft forming the anterior termination of the genital fossa. The anterior lamJna bears on each side at or near the margin a more or less acute process, the spiite of the anterior lamina (sp), which is directed more or less caudad and either ventrad or dorsad according to the species. In form and size it exhibits great variation within the limits of the genus, but offers excellent group and some- times specific characters. (b). The genitalia of the female—These are situated on the ventral side of segment 9. Under this term are included the ovipositor, genital valves, styli and lateral genital plates. FiG. },—At~shna cUhsydra fcnnle perital''a anH appenJsircs, vehtni v ;ew : bt< haaal plate ip lateral plate ; orv ovipositor : g^ genital valve : 5/ 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 University of Toronto; Toronto, Ont. University. University of Toronto studies. Biological series. Toronto University Press [etc. ]
Size: 1107px × 2256px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1898
