NEW MALLOPHAGA. 547 



aspect, of Eurymetopus taurus; ant h anterior horn, bs "bonnet string." 

 Fig. 4, Eight maxilla, ventral aspect, of Eurymetopus taurvs. Fig. 5, Man- 

 dibles, ventral aspect of Eurymetopus taurus; c condyles, r right mandible, 

 I left mandible. Fig. 6, Labium, ventral aspect, of Eurymetopus taurus; 

 sm submentum, m mentum, g glossa, pg paraglossa. Fig. 7, "Lingual 

 gland," ventral aspect, of Eurymetopus taurus; d duct, m s oesophageal 

 sclerite, ch ped chitinous pedicle. Fig. S, Left "lingual gland," ventral 

 aspect, of Eurymetopus taurus; d duct, ch ped chitinous pedicle, mus 

 muscle, Ig the gland. 



PLATE LXIIL— Fig. 1, Labium of Colpocephalum sp.; sm sub- 

 mentum, m mentum, pf palpifer, Ip labial palpus, g glossa, pg para- 

 glossa. Fig. 2, Labium of Trinolon luridum; sm submentum, m mentum, 

 p/ palpifer, Ip labial palpus, g glossa, pg paraglossa. Fig. 3, Labium of 

 Nirmus sp. ; sm submentum, m mentum, g glossa, pg paraglossa. Fig. 

 4, Mandibles, ventral aspect, of Menopon titan; c condyles, r right mandible, 

 I left mandible. Fig. 5, Labium of Physostomum angulatum; sm sub- 

 mentum, m mentum, pf palpifer, Ip labial palpus, g glossa, pg paraglossa. 

 Fig. 6, Labium oiNitzschia dubius; sm submentum, m mentum, pf palpifer, 

 Ip labial palpus, g glossa, pg paraglossa. 



PLATE LXIV. — Fig. 1, Labium of Termopds angusticollis ; sm sub- 

 mentum, m mentum, Ip labial palpus, g glossa, pg paraglossa. Fig. 2, 

 Maxilla of Termopsis angusticollis; cd cardo, st stipes, pf palpifer, lac 

 lacinia, gal galea, mx p maxillary palpus. Fig 3, Labium of nymph of 

 Perla; sm submentum, m mentum, Ip labial palpus, g glossa, pg para- 

 glossa. Fig. 4, Maxilla of nymph of Perla; cd cardo, st stipes, lac 

 lacinia, gal galea, mx p maxillary palpus. Fig. 5, Head, ventral aspect, 

 of Atropos sp.; sm submentum, m mentum, mx maxilla, mx p maxillary 

 palpus, md mandible, clyp clypeus, lb labrum, g glossa, pg paraglossa, 

 fk fork. Fig. 6, Mandibles of Atropos sp.; c condyles, r right mandible, 

 I left mandible. Fig. 7, Head, dorsal aspect, of Atropos sp.; clyp clypeus, 

 ant antenna, ces oesophageal sclerite. Fig. 8, Mandible and mandibular 

 muscles of Psocus sp.;/m flexor muscle, em extensor muscle, m molar 

 face of mandible (after Burgess). Fig. 9, Longitudinal section through 

 middle of head of Psocus sp.; " el clypeus, I labrum, mand mandible, 

 the dotted line ending on the ribbed molar surface which tapers beneath 

 into the sharp cutting edge; mx maxilla, t tongue, /fork, lb labium and 

 Ip its palpus, to mentum, I g lingual gland and g m its suspensory muscle, 

 ce oesophagus opening below into the oral cavity at the base of which is 

 the oesophageal bone, a b; fm flexor muscle of the mandible and I m the 

 muscle of the labrum, c m muscles of the clypeus, gl supra-cesophageal 

 ganglion" (after Burgess). Fig. 10, Labium, posterior aspect, of Psocus 

 sp.; "to mentum, lb labium, Ip one-jointed labial palpus, behind which 

 one sees the tip of the fork, /; c cardo, p stipes having the four-jointed 



