. Smithsonian miscellaneous collections. ble which may be called serratus epistomalus(fig. 7, SE) and which corresponds to Hopkins median the serratus epistomalus the acciculation of the front epistoma is without sculpture and bears a row of bristles on itsposterior margin. The mandibles articulate with the underside of theepistoma. NO. TO MORPHOLOGY OF GNATriOTRICHUS SCTIEDL 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. a-. La / Md b- —, v-^^p* ^^w 0— —- i^ „--Mx Hy- 7 ^4^^ •
. Smithsonian miscellaneous collections. ble which may be called serratus epistomalus(fig. 7, SE) and which corresponds to Hopkins median the serratus epistomalus the acciculation of the front epistoma is without sculpture and bears a row of bristles on itsposterior margin. The mandibles articulate with the underside of theepistoma. NO. TO MORPHOLOGY OF GNATriOTRICHUS SCTIEDL 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. a-. La / Md b- —, v-^^p* ^^w 0— —- i^ „--Mx Hy- 7 ^4^^ •-; Any- Ey ^C±l l Hi I Ge Ge Pr- Oct--- Cos --Oca Fig. 6.—Gnathotrichus sulcatiis Lee.: Head, ventral aspect. An, antenna; Cos, coronal suture; £v, compound eye; Ge, gena; Gus, gular sutures; Hy,hypostoma; La, labium; Md, mandible; Mx, maxilla; Oc, occipital area; Oca, occipitalapodeme; Oct, occipital foramen; Pr, pregula; a, dorsal articulation of the mandible; b,ventral articulation of the mandible; c, antennal B Fig. 7.—A, Gnathotrichus snlcatus Lee.: Head, oral aspeet. B, Gnathotrichusretustis Lee.: Pregula. An, antenna; Ef>, epistoma; Gc, gena; Gus, gular sutures; Fr, frons; Hy, hypostoma;La, labium; Mx, maxilla; Pr, pregula; SE, serratus epistomalus; a, dorsal articulation ofmandibles; b, Ientral articulation of mandibles; c, antennal groove. These two distinct sutures appear to be exceptional in this apparently did not find any double sutures in his investi-gations. 22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 82 In Gnathotriclius, the pregula (figs. 6, 7, Ir) is always withoutsculpture or hairs. The very distinct specific modifications are de-scribed in the following key: A—Pregula flat, triangular, not produced anteriorly, its anterior mar-gin continuous with those of the gena. Gn. sulcatus —Pregula convex, produced anteriorly, its anterior not continuouswith those of the gena. B—Pregula very convex, extending f
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