. Smithsonian miscellaneous collections. g. 14) is represented as onecontinuous plate in the shape of a trapezium of which the base isformed by the remainders of the pleuro-notal suture. Ventrally thepleural area is completely fused with the prosternum (St). Externallyno sufficiently distinct lines are present to justify the distinction ofsubdivisional plates as episternum, epimeron, etc. Nevertheless therecan be distinguished three parts of different structure which one maycall the preepisternal (Peps), the episternal (Eps) and the epimeral NO. 10 MORPHOLOGY OF GNATHOTRICHUS SCHEDL 33 area (E
. Smithsonian miscellaneous collections. g. 14) is represented as onecontinuous plate in the shape of a trapezium of which the base isformed by the remainders of the pleuro-notal suture. Ventrally thepleural area is completely fused with the prosternum (St). Externallyno sufficiently distinct lines are present to justify the distinction ofsubdivisional plates as episternum, epimeron, etc. Nevertheless therecan be distinguished three parts of different structure which one maycall the preepisternal (Peps), the episternal (Eps) and the epimeral NO. 10 MORPHOLOGY OF GNATHOTRICHUS SCHEDL 33 area (Epm). The preepisternal area is flattened, slightly depressedwith a surface smooth except for a few minute wrinkles parallel tothe longer axis. The episternal area is entirely covered by continua-tions of the serrations which occur on the anterior half of the pro-notum. A narrow strip along the posterior margin of the propleuron,quite distinctly limited to the surrounding plates by its transversewrinkles, may be called the epimeral StJCP Ti Fig. 15.—GiiatJwtrichus retusus Lee: Prosternum and fore legs. C, coxa; F, femur; ICP, intercostal process; Pst, poststernal area; St, sternal area; Ta, tarsus; Ti, tibia. Sternal area.—The lateral ill-defined sternal area is largely occupiedby the coxal cavities (CxC). The intercoxal process (ICP) be-longing to the intercoxal or sternellar plate is clearly defined andvery short so that the coxae touch each other. The sternum properand the presternal area are again not limited by sutures but by dif-ferences in sculpture. Prothorax.—The distinguishing characters of the prothorax are: 1. The pronotuni of Gn. materiarius Fitch is a little more slender than that of Gn. retusus Lee. and sulcatus Lee. 2. The punctures of the posterior half of the pronotum of Gn. retusus Lee. are somewhat coarser than in the case of the others. 34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 52 THE MESOTHORAX The mesothorax is the shortest of the three th
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