NO. 10 



MORPHOLOGY OF GNATHOTRICHUS SCHEDL 



33 



area (Epm). The preepisternal area is flattened, slightly depressed 

 with a surface smooth except for a few minute wrinkles parallel to 

 the 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 transverse 

 wrinkles, may be called the epimeral area. 



St 

 JCP 



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 occupied 

 by the coxal cavities (CxC). The intercoxal process (ICP) be- 

 longing to the intercoxal or sternellar plate is clearly defined and 

 very short so that the coxae touch each other. The sternum proper 

 and 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. 



