xxx LIST OF ILLUSTRATIONS 



FIG. PAGE 



513. Podura 616 



514. Locusta 617 



515. An Embiid 617 



516. Psocus f asciatus 617 



517. Mallophaga 617 



518. Ephemera .618 



519. Aphis rosse 618 



520. Cicada 619 



521. Culex and larva . . . . ' 619 



522. Gastrophilus equi 619 



523. Pieris 620 



524. Crioceris 620 



525. Panorpa communis 621 



526. Section of integument of Insect 622 



527. Mouth-parts of Honey-bee 622 



528. Diptera 623 



529. Lepidoptera 624 



530. Digestive organs of Beetle 626 



531. Nervous, tracheal, and digestive systems of the Honey-bee . . 626 



532. Tracheal gills of Ephemerid 628 



533. Heart of Cockchafer 628 



534. Nervous system of Diptera 629 



535. Ocellus of Dytiscus larva 630 



536. Sexual apparatus of Honey-bee 631 



537. Segmentation of ovum of Insect 633 



538. Germinal layers and amnion of Insect 633 



539. Development of Hydrophilus . 634 



540. 635 



541. Apis mellifica, queen, worker, and drone 636 



542. Formica rufa 636 



543. Euscorpio 639 



544. Ventral surface of cephalothorax and pre-abdomen of Scorpion . 639 



545. Endosternite of Scorpion . . . 640 



646. Scorpion, anatomy, lateral view 641 



547. dorsal 642 



548. development .643 



549. Embryo of Scorpion 644 



550. Chelifer bravaisii 646 



551. Phrynus 647 



552. Galeodes dastuguei 647 



553. Epeira diadema 648 



554. ,, ,, chelicerae and pedipalpi of female .... 648 



555. ,, ,, pedipalp of male 648 



556. Sarcoptes scabisei 649 



657. Trombidium fuliginosum 649 



658. Limulus 650 



559. ,, ventral view 651 



560. Eurypterus fischeri 652 



