584 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57, 



ward. The Tibia (tib) is about as long as femur; dorsally convexly 

 curved; directed forward. The Tarsus (ta) is clawshaped, probably 

 fused with a claw, slightly curved and pointed, of medium size, except 

 in Hydnocera, where it is small. 



The Abdomen is straight and fleshy, varying in general appear- 

 ance. It may be subclaviform as in Tkaneroderus and Orthopleura, 

 or digitiform as in Enoclei'us and Oymafodera, or vermiform as in 

 Monophylla and Neichnea^ this variation mainly due to whether 

 most of the abdominal segments have the same size or not, whether 

 postscutellum is large or small, and whether the areas which con- 

 stitute the intersegmental membranes form an expanded or narrow 

 band. The number of the abdominal segments is 10; the first to 

 eighth segments have laterally placed spiracles; the ninth is with- 

 out any spiracles and usually carries cerci; the tenth is pierced by 

 the anal opening. 



Notches {Nodi). — The abdominal notches are located between 

 the segments as described between the metathorax and the first 

 abdominal segment; as here the sternal notch is predominant to 

 the ventral notch, which latter is faintly indicated and fused with 

 the sternal notch or totally absent; the pleural notch is much closer 

 to the lateral notch than in the thoracic segments and not so pro- 

 nounced; in genera with long abdomen and large intersegmental 

 membranes the dorsal and lateral notches are developed as short 

 longitudinal lines and not as pits. 



Sutures. — The dorso-lateral sutures between the dorsal notches 

 and below the spiracles are well defined in all forms except Ortho- 

 pleura., where all sutures are very faint. Anteriorly, behind the 

 pre-epipleural arm, and posteriorly, in front of the post-epipleural 

 arm, the suture is nearly perpendicular; medianly, between the 

 alar area and the epipleurum, horizontal and straight. The ven- 

 tro-lateral sutures between the lateral notches are horizontal and 

 straight; anteriorly, between a lateral and pleural notch and above 

 presternum, the ventro-lateral suture is faintly indicated or even 

 evanishing, as described in thorax, but posteriorly, above hypo- 

 pleurum, deeply marked. The scuto-scutellar suture is well de- 

 veloped and provided with an anterior and posterior oblique branch ; 

 in Necrohia and other forms even a ventrally directed branch is 

 present in direct continuation of the main suture. That suture 

 which defines postscutellum anteriorly is straight, rather perpen- 

 dicular, and the suture which marks the dorsal boundary of the 

 alar area branches out from it in an oblique forward and ventral 

 direction. In Necrohia a deep, transverse suture separates a large 

 preeusternal area from the eustemal area; this suture is not, or 

 only faintly, developed in the other genera. Another transversal 

 suture separates eusternum from mediosternellum. Two oblique 



