DESCRIPTIONS OF PLATES. 635 



tube (Swaimn.). Fig. 4, Pupa of Culex. a a, Air tube (ib.). Fig. 5, Larva 

 of Chironomus. a. a, Air tubes at tail, b, Air tubes at breast (Reaumur). 

 Fig. 6, Pupa of Chironomus. a a, Branchial fasciculus on the thorax (ib.). 

 Fig. 7, Larva of Corethra. a, Branchial fasciculus at tail. 6, First, and c, 

 Second pair of bladders, which stand in connexion with the intestine/, d, 

 Mandible, e, Antennae. Fig. 8, Pupa of Corethra. a a, Air tubes, b 6, Anal 

 leaves (ib.). Fig. 9, Larva of Simulia. a a, Fasciculi on the head, which are 

 perhaps palpi, b b, Antenna, c, Air tube in the thorax, d d, Indicated spi- 

 racles, e e, Anal air tubes (Verdet). Fig. 10, Pupa of Simulia. a a, Branchial 

 fasciculi, b 6, Wing sheaths, c, Head, d, Thorax from the back, e, Ab- 

 domen (ib.). Fig. 11, View from above of the head of Carabus glabratus. 

 A, Skull, c, vertex. B, Frons. b, Sinciput, c, Clypeus. I, Labrum. 

 O O, Mandibles, y y, First joints of the antennae, a a, Eyes. Fig. 12, 

 Under view of the same. D, Gula. d, Swollen margin of the same. G, 

 Occiput. Q,, Mentum. O O, Mandibles. P P, Maxillae, a a, Eyes. Fig. 13, 

 Lateral view. S, Facies. E, Cheek. F, Temples, y, Socket of the antennse. 

 The other letters as before. Fig. 14, Lateral view of the head of Myopa 

 testacea. B, Frons. a, Vertex. E, Cheek. F, Temples. G, Occiput. M, 

 Mouth, c, clypeus (hypostoma, Meig.). d, proboscis, e, Whisker, y, 

 Antennae. Fig. 15, Labium of Vespa vulgaris. a a, Glandular points of the 

 four-lobed tongue, b, Chin, c e, Palpi (Treviranus). Fig. 16, Maxilla of 

 Cychrus restrains, from above. l,Cardo. 2, Stipes. 3, Squama. 4, Mando. 

 5, Palpus maxillae internus, or galea. a,Basaljoint. b, Apical joint. A, palpus 

 maxillaris. e, The groove. Fig. 17, The same from beneath. Fig. 18, 

 Maxilla of Spondyla buprestoides, with the same lettering. Fig. 19, Maxilla 

 of Melolontha vulgaris, with the same lettering. 



PI. IV. Fig. 1, Anterior view of the head of Myopa testacea. a a, Eyes. 

 y y, Antennas, c c, Hypostoma. d, Proboscis. Fig. 2, Maxilla of Copris 

 lunaris, with the lettering as in fig. 16 of preceding plate. Fig. 3, Labium of 

 Cychrus rostratus. A, Mentum. B, Ligula. C C, Palpi. Fig. 4, The same 

 from within. A, Mentum. B, The bilobed tongue. Fig. 5, Lateral view of 

 the labium of Locusta viridissima. a, Superior lobe of the mentum, forming 

 the true mentum. b, Basal joint of the left palpus, c, Basal portion of the 

 mentum. d, The loose tongue. Fig. 6, Head of Ateuchus sacer. a a, The 

 eyes (Sturm). Fig. 7, Head of Truxalis nasutus. a, Root of antenna, b, Eye. 

 c, Labrum. d d, Maxillary palpi, e e, Labial palpi. /, Labium. Fig. 8, 

 Mandible of Hydrophilus piceus. a, Incisor teeth, b, Molar process, c, Lower 

 joint ball, d, Superior bent joint ball, e, Situation of the third internal 

 process, where the flexor muscle is inserted. Fig. 9, Maxilla of Lucanus cervus. 

 1, Cardo. 2, Stipes. 3, Squama. 4, Mando. 5, Peuicillate lobe. A, 

 Palpus (Sturm). Fig. 10, Maxilla of Cicindela campestris. As far as 4 the 

 same as above, the latter internally beset with teeth, and with a superior move- 



