XIV LIST OF ILLUSTRATIONS. 



Page. 



Forms of the anal loop in the Aiiisoptn-<i 722 



Wings of Nevrolhfmis oeulata Fabricins 724 



Wings of Tetnujoneuria eynosura Say 724 



Diagram illustrating the emergence of strong cross veins 726 



Diagram showing how hexagonal cells become rectangles and how cross veins 



become matched in transverse lines across the wing 727 



Wings of Chalcoj)teryx rutilans Rambur 729 



Wings of Hagenius bretndylus Selys 730 



Wings of Chlorogoinphus magnificus Selys, female 733 



Wings of Cordulrgaster sayi Selys 734 



Wings of PhyUopetaUa apicalis Selys 734 



Wings of Agriogomphus spJ 738 



Bases of wings of Petalura gigantea Leach 739 



Wings of TaeJwpteryx hageni Selys 740 



Wings of an undescribed species of NeocordvUa from Brazil 741 



Base of wings of Isophlepia (fossil) in part after Deichmiiller 743 



Wing of Psexdojihaxi sp.f 744 



Base of fore wing and a bit of hind wing of Rhinocypha sp.f 744 



Calopteryx macnlata Beauvois, fore wing and base of hind wing 745 



Base of wings of Thore gigantea Selys 746 



Hind wing of Cora incana Hagen 747 



Wing of Megaloprepus ceruleatus Drury 748 



Wings of Hemlphlehia mirahilis Selys 749 



Diagram illustrating a typical (hypothetical) arrangement of the areoles in 



one of the wider spaces of the wing 751 



Drawing of parts of'wings, showing the actual cell arrangement: a, Epigom- 



plius paludosns; b, Agrionoptera insignls 752 



Wing of Vestalis amcena, Selys 753 



Diagram (hypothetical) of the evolution of a l)ra(;e for a unilateral fork; 



successive stages 754 



Wings of Xeurobasis katipii Brauer 754 



Wing of Fh'doganga inontaiia Selys 755 



Elkis nikko)i'ts 768 



Orthrias oreas 770 



Pseudoperilampus typas 814 



A cheilognathus cyanostigma 821 



Leucogobio mayedsc 828 



Leucogobio biw.r 830 



Abbottina psegma 836 



Otakia rasborina 842 



Leuciscus phalacrocora.r 846 



Ischikauia steenackeri 858 



Palatal aspect of skull: a, LidreoJamacrodon; b, Lutreolavisvn iiigem; e, Lvtreola 



visoa hittrocephalus 887 



Antennute of Lepidopa )iiy<>p!i 890 



Lcpidopa vemista 892 



Lepidopa tvebsteri 892 



Lepidopa myops 893 



Lepidopa deamie, natural size 893 



Lepidopa scidellata 894 



Lepidopa mearnsi 895 



Lepidopa richmondi 895 



Fluvidraco ransonnetii 905 



