352 Afinals Entomological Society of America [Vol. XI, 



which overlaps it, it thus is incorrect to state that the pronotum 

 has crowded out the propleural region and has assumed its 

 functions. 



At the base of the leg is a small articulatory plate "tn" of 

 Figs. 1 and 2. This represents a portion of the trochantiii, which 

 is much reduced in the Orthoptera. 



The Leg. 



Only the basal segments of the leg are shown in the accom- 

 panying figures, the femur being shortened in each case. As 

 shown in Fig. 2, the prothoracic coxa, "cxi," is divided into 

 several subdivisions, but these have no especial significance. 

 One of these subdivisions bears a coxal spine "cs." The coxa is 

 broader than long. The trochanter "tr", is small and is quite 

 closely united with the. femur. 



The Prosterniim. 



The pleural region of the thorax is connected with the 

 prosternal region by a pre-coxal bridge extending in front of the 

 sclerite "tn" (Fig. 2). This pre-coxal bridge is largely made up 

 of a lateral wing of the sternal region, although a small portion 

 of the pleural region is also involved in its make-up. 



The anteriormost sclerite of the prosternal region is the 

 small plate "ps" (Fig. 2), which is homologous with the so-called 

 presternum of lower insects. Immediately back of the pre- 

 sternum "ps" is a narrow anterior marginal region "pri," 

 homologous with a similar anterior marginal region "pr^" in 

 the mesosternal region. The term prepectiis has been very 

 appropriately applied to this region in the Hymenoptera by 

 Snodgrass, 1910, although Snodgrass does not think that the 

 sclerite of the Hymenoptera is homolgous with this sclerite in 

 the Orthoptera. Just behind the region "pr" is the basisternum 

 "bsi," whose lateral wings form the precoxal bridges connecting 

 it with the pleural region on either side. In some grasshoppers, 

 this region (the basisternum) bears a prominent spine, the 

 prosternal spine (Text Fig. 1, "sp") projecting backward 

 between the front coxae. The presence or absence of this spine 

 is a feature used in classification. Behind the region "bsi" 

 (Fig. 2) is an area largely composed of the spinasterniim, or 

 fourth chief sternal subdivision which has united with the 

 third to form a region sometimes called the sternellum. In this 



