550 The University Science Bulletin. 



by the pronotum. On its anterior margin it bears the anterior 

 phragma (pi. LVII, fig. 7), a semimembranous, bilobed, narrow 

 structm-e which is connected to the pronotmn by a membrane. 



The scutum (pL LVII, fig. 7) of the mesothorax is an irregular 

 sclerite, occupying the entire lateral regions of the notum. It ap- 

 pears to consist of two sclerites, since the anterior point of the 

 scutellum almost reaches the caudal boundary of the prescutum. 

 At its laterocaudal angles the scutum is deeply incised to allow for 

 the wing processes. 



The scutellum (pi. LVII, fig. 7) is composed of a large shield- 

 shaped piece, which is visible externally and two narrow lateral 

 portions which connect with the anal margins of the wing and are 

 not visible externally. The large median part is separated from 

 each lateral part by a narrow groove into which the deflexed claval 

 portion of the wing fits. 



There are several small sclerites to be found connecting the base 

 of the wing with that of the notum. On the anterolateral corner of 

 the scutum is a small piece, called by Taylor (1918) the suralare. 

 It is marked by a cleft which extends forward. As in the Cicada, 

 another cleft extending backward marks off a similar piece. Just in 

 front of the incision made by these clefts is a small triangular, free 

 plate, the notopterale. Caudad of this plate, imbedded in the mem- 

 brane, is a larger, subrectangular plate called the adanal pterale. 

 There is no indication of the presence of the tegula, which agrees 

 with the conclusion of Taylor that the tegula is not present in the 

 families of Homoptera outside of the Fulgoridae and Cicadidse. 



Cephalad of the wing the notum is connected to the pleuron by a 

 narrow prealare bridge (pi. LVII, fig. 7). The postscutellum is con- 

 nected to the epimeron by a similar postalare bridge (pi. LVII, 

 fig. 6). 



The postscutellum is a narrow sclerite, entirely hidden by the 

 scutellum and is membranous in structure. 



The pleuron (pi. LVII, fig. 6) is somewhat more complicated than 

 that of the prothorax. The pleuron, in fact, forms a major part of 

 the ventral body wall, so that the shape of the episternum and epi- 

 meron can best be seen from a ventral view (pi. LVII, fig. 10.) The 

 pleural suture (pi. LVII, fig. 6), is ciuite distinct, consisting of an 

 almost straight line extending from the base of the prealare bridge 

 to the base of the coxae. 



The epistermnn (pi. LVII, fig. 10) is a single sclerite, which is not 

 divided into an anepisternum and katepisternum unless a diagonal 

 elevated ridge is an indication of this division. The episternum 



