188 KANSAS UNIVERSITY SCIENCE BULLETIN. 



the Cicadidse, under legs, this sclerite is called the "meracan- 

 thus" ("A la base des hanches et specialement aux posterieures, 

 nait, visible chez les Fulgorides et remarquablement developpee 

 chez Cicada, une epine subulee, au lobe triangulaire, lanceolee, 

 cornee, qui est encore assez distincte aux hanches intermedi- 

 aires, Le Dr. Hagen [Die europ. Cicaden, Stett. ent. zeit. 1886] 

 appelle trochanter [Klappe] cet appendice corne qui doit etre 

 designe sons le nom vrai de Meracanthus, pi. 10, fig. 9, b, car 

 le trochanter n'a pas d'apendice"). 



Focusing upward with the high power, the next sclerite, also 

 crescent-shaped, with parallel edges, which is seen to be the 

 next extad, comes into view (fig. 8, em 3). It is this sclerite 

 which articulates at x and y (figs. 7, 8). This I believe to 

 represent the metaepimeron. Cephalad and laterad of these 

 sclerites is a platelike piece, the cephalic end of which bends 

 dorsad and entad, and forms a ring. This structure is seen in 

 figure 8, cox. On this ring, the trochanter articulates (also 

 upon the end of the episternum), and since this sclerite is the 

 only one which in any degree approaches the typical cylindrical 

 coxal form, being in this case a sort of ring at its end, I take it 

 to be the coxa. Entad (dorsad) of this, and slightly cephalad, 

 is an accessory sclerite (55-8 and 9, scl), a rod whose caudal 

 end is flattened out into a plate to which are attached muscles 

 that arise from the inner surface of the meracanthus, or epi- 

 meron (which of these two, I am as yet unable to state) . The 

 cephalic end is connected to the cephalic edge of the trochanter 

 and serves to pull it towards the body. Its position is shown in 

 figure 8, plate XXXV. 



Turning now to the internal structure of the metathorax, 

 which is best seen from the front, when this segment is severed 

 from the others the metafurca {30-%; 31-7; 27-5, mf) are 

 the most prominent features. The two large forks which pro- 

 ceed dorsad and caudad are connected with the lower surface 

 of the tergum. The whole endoskeleton is so closely fused with 

 the sclerites o'f the metathorax that it cannot always be sepa- 

 rated from them. This internal structure is large and heavy, 

 and by bracing all parts makes the segment exceedingly strong 

 and rigid. 



The structure of the pleural sclerites in a species of Aleuro- 

 did which I examined was also found to be very complex, there 

 being a large number of sclerites homologous to those found in 



