DESCRIPTIONS OF PLATES. 637 



margin of the labrum. /, Internal passage for the reception of the maxillary 

 setae. Fig. 15, Head and oral organs of Noctua libatrix (Savigny). AA, Eyes. 



a, Labrum. b b, Mandibles, c, The maxillae partially united and forming 

 the proboscis, d d, Maxillary palpi, e e, Articulating cavities for the labial 

 palpi in the reflexed labium. Fig. 16, Labrum of the same moth separate (ib.). 

 Fig. 17, Both of the mandibles of the same moth (ib.). Fig. 18, Labium 

 of the same moth (ib.). e, Labium. d d t Labial palpi divested of their hair 

 and scales. 



PI. VI. Fig. I, Maxilla of the same moth (ib.). a, The filiform portion. 



b, The palpus. 1, The cardo. 2, The stipes. 3, The squama. 4, The 

 mando. Fig. 2, Section of the proboscis (ib.}. a a, Ridges which close the 

 central canal of the proboscis above, o, The central canal, p p, The canals 

 in each half of the proboscis. Fig. 3, Head of Gcdleria cereana (ib.). A, Eye. 

 B, Antenna, d, Labial palpus, e, Projecting proboscis. Fig. 4, Parts of 

 the mouth of the same moth. /, The proboscis, consisting of two halves. 

 </<7, Palpi of the proboscis, d d, Labial palpi, e, The labium. Fig. 5, Head 

 of a neuter Apis mellifica seen from beneath, a, Mentum. A, Fulcrum. 

 6, Tongue (a pierced sucking tube), g g, Paraglossse. c c, Four-jointed labial 

 palpi attached to the tongue close to the fulcrum, d d, Pergamentaceous 

 maxilla?, h h, One-jointed maxillary palpi, ff, Mandibles, n n, Horny 

 ridges in the articulating membrane of the parts of the mouth, in. Occipital 

 aperture. Fig. 6, Mouth of the same insect similarly marked, e, The valve of 

 the oesophagus, the second tongue according to Treviranus. 1, 2, 3, 4, 5, The 

 several horny bones which lie ill the articulating membrane. Fig. 7, Lower 

 portion of the proboscis (tongue). 5, With the paraglossae a a, (Brandt). 

 Fig. 8, Anterior view of the head of Apis meUifica. A A, Eyes. B, Stemmata. 

 C C, Antenna?. D, Clypeus. E, Labrum. //, Mandibles, d d, Maxillae. 

 c c, Labial palpi, b, Proboscis or tongue. Fig. 9, Head of Pktyganea graudis 

 seen in front. A A, Eyes, a a, Mandibles, b, Labrum. c c, Maxilla?. 

 d d, Maxillary palpi, e e, Labial palpi, f, Spoon-shaped Labium. Fig. 10, 

 Labium seen from above. c c, Maxillae. e e, Maxillary palpi, d, The 

 channel of the under lip which leads to the orifice, g, of the oesophagus. 

 Fig. 30, Labium from beneath, f J\ Labial palpi, ee, Basal joints of the 

 maxillary palpi, y, Fulcrum. 



PI. VII. Fig. 1, Setiform antenna of Locusta. Fig. 2, Ditto ditto of Cicada. 

 Fig. 3, Bodkin-shaped ditto of Lcptis. Fig. 4, Filiform ditto of Carabus. 

 Fig. 5, Moniliform ditto of Tenebrio. Fig. 6, Sword-shaped ditto of Truxalis. 

 Fig. 7, Sickle-shaped ditto (Kirby and Spence). Fig. 8, Dentate ditto of Ste- 

 nochorus. Fig. 9, Serrate ditto of Elalcr. Fig. 10, Imbricate ditto of Prionus 

 coriarius,mn\e. Fig. 11, Pectinated ditto of Ctenocerus. Fig. 12, Doubly- 

 pectinated ditto of Ctenophora. (Meigen). Fig. 13, Curled antenna (Kirby 



