NO. 10 



MORPPIOLOGY OF GNATIIOTRICHUS SCHEDL 



21 



Gtila. — The gula is bounded by the two very closely placed gular- 

 sutures (figs. 6, 7, Gus) and widens anteriorly to form the pregula. 



La .Md 



Gus 



Fig. 6. — Gnathotrichus siilcatus Lee. : Head, ventral aspect. 



An, antenna; Cos. coronal suture; Ev, compound eye; Ge, gena; Gus, gular sutures; Hy, 

 hypostoma; La, labium; Md, mandible; Mx, maxilla; Oc, occipital area; Oca, occipital 

 apodeme; Oct, occipital foramen; Pr, pregula; a, dorsal articulation of the mandible; b, 

 ventral articulation of the mandible; c, antennal groove. 



B 



Fig. 7. — A, Gimthotrichus sidcatus Lee. : Head, oral aspect. B, GnatholricJins 

 retusiis Lee. : Pregula. 



An, antenna; Ep, epistoma; Ge, gena; Giis, gular sutures; Fr, frons; Hy, hypostoma; 

 La, labium; Mx, maxilla; Pr, pregula; SE, serratus epistomalus; a, dorsal articulation of 

 mandibles; b, ventral articulation of mandibles; c, antennal groove. 



These two distinct sutures appear to be exceptional in this family. 

 Hopkins apparently did not find any double sutures in his investi- 

 gations. 



