222 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATES. 



PLATE X. — Fig. 1, Median dorsoventral longitiidinal section of ante- 

 rior half of Menopon titan; h head, t^ prothorax, t., mesothorax, t^ meta- 

 thorax; cij first abdominal segment, a.^ second abdominal segment, biv 

 outer body-wall, 6m basement membrane, m mouth-opening, be buccal 

 cavity, p pharynx, ce cesoi^hagus, cr crop, v anterior end of ventriculus, 

 sg salivary gland, 6 brain, s.ce. g subcesophageal ganglion, </j prothoracic 

 ganglion, g.2 mesothoracic ganglion, g^ metathoracic ganglion, tr trachea, 

 bn longitudinal muscle, im transverse muscle, o anterior end of an egg- 

 tube cut near the surface. Fig. 2, Throat skeleton with attached glands 

 of Eurymetojnis taurus; oe. s oesophageal sclerite, I. g glands, d duct, ch. 

 ped chitinous pedicle. Fig. 3, Left maxilla, ventral aspect, of Goiiiodes 

 cervinicornis. Fig. 4, Labial ior'k oi Ancistrona gigas. Fig. 5, Mandibles, 

 ventral aspect, of Ancistrona gigas. Fig. 6, Mandibles, posterior aspect, 

 of Goniodes cervinicornis. Fig. 7, Oesophageal sclerite, dorsal aspect, of 

 Eurymetopus taurus; d duct, do opening of duct, m median groove, ant. p. 

 anterior process, c. m circumoesophageal process. Fig. 8, Hypopharynx 

 of Ancistrona gigas. Fig. 9, Labium of Nitzschia dubius; sm submentum, 

 m mentum, ^;/palpifer, IjJ labial palpiis, g glossa, pg paraglossa. Fig. 10, 

 Right maxilla, ventral aspect, of a Litmobothrium. Fig. 11, Mandibles, 

 ventral aspect, of Lcemobothrium sp.; c condyles, r right mandible, I left 

 mandible. Fig. 12, Eight mandible, posterior aspect, of Goniodes cervini- 

 cornis; c condyle, ch pis chitinous plates. Fig. 13, Labium, ventral 

 aspect, of Eurymetojnis taurus; sm submentum, m mentum, g glossa, pg 

 paraglossa. 



PLATE XI. — Fig. 1, Salivary glands of Trichodectes geomydis; a outer 

 gland, b inner gland. Fig. 2, Salivary organs of Menopon titan (after 

 Grosse); a salivary gland, b saliva reservoir. Fig. 3, Large-celled salivary 

 gland of Trichodectes geomydis, with the cells in natural position; d duct. 

 Fig. 4, Same as last but with cells spread apart showing branches of duct 

 [d) to individual cells. Fig. 5, Large-celled gland of Eurymetopus taurus; 

 d duct. Fig. 6, Longitudinal section of part of Malpighian tubule of Men- 

 opon titan; mp membraua propria, e;5 epithelium, in intima. Fig. 7, Part 

 of alimentary canal with Malpighian tubules of Colpocephalum osborni; v 

 lower end of ventriculus, i upper end of intestine. Fig. 8, Alimentary 

 canal of Docophorus lari. Fig. 9, Crop (cr) with part of oesophagus and 

 ventriculus of a Trichodectes from a horse. Fig. 10, Alimentary canal of 

 Trichodectes geomydis; g large-celled glands of crop. Fig. 11, Alimentary 

 canal of Eurymetopus taurus, ventral view; r outer salivary glaijd or 

 saliva reservoir, j/j inner gland, g^ large-celled gland. Fig. 12, Alimentary 

 canal of Goniodes cervinicornis. Fig. 13, Alimentarj^ canal of Menopon 

 titan. 



