l8 ENTOMOLOGICAL NEWS [Jan., '14 



vided by sutures (with, or without corresponding internal 

 folds) into a number of subregions, or subdivisions. The 

 foremost of these is a narrow, transverse region, the pre- 

 tergite, Am (Figs. 2, 4, 5 and 6), lateral to which is the pre- 

 alare, Pal (Figs. 2, 4 and 5). Behind the region Am is 

 the prescittum, Psc (Figs. 2. 4, 5 and 6). Following the 

 prescutum is the scutum, Sc (Figs. 2, 4, 5 and 6). Situated 

 somewhat anteriorly and laterally to the scutum is a narrow 

 sclerite, the supraalare, At (Figs. 2, 4, 5 and 6), with which 

 the wing veins articulate by means of a small movable, or ar- 

 ticulatory plate, the notopterale, Npt (Figs. 2, 4, 5 and 6). 

 (These articulatory plates by means of which the wing veins 

 articulate with the tergal plate, have been recently termed the 

 pteralia}. Situated in the incision between the sclerites Pal 

 and At, is the tegula, or parapteron, Tg (Figs. 2, 4, 5 and 

 6). The scutum, Sc, may be divided into subregions by the 

 formation of sutures, or even a transverse fissure. The prin- 

 cipal subdivision is the ju.rtascntellum, Jsl (Fig. 2) situated 

 on either side of the scutellum, SI (Figs. 2, 4, 5 and 6). The 

 sclerite Jsl is not marked off in the insects figured in the series 

 here given, but occurs in the Diptera and Hymenoptera. An 

 articulatory extension of the scutum, termed the anal pterale. 

 Sept (Fig. 2), becomes detached in the higher insects, and 

 forms one of the pteralia mentioned above. A narrow, poster- 

 ior, marginal sclerite, the poster git e, Pm (Figs. 2, 4, 5 and 6) 

 is the hindmost of the subdivisions of the tergal plate Scsl. 

 It sometimes occurs as a posteriorly-projecting, fold-like re- 

 gion of this plate. A median dorsal suture (with its corre- 

 sponding internal fold, or "implex") called the mid-dorsal su- 

 ture may partially divide the tergal plate into symmetrical 

 halves. 



The posterior tergal plate, or postscutellum Psl (Figs. 2, 4 

 and 5), is not connected with the wing, but is usually connect- 

 ed with the pleural region in the higher insects, as was men- 

 tioned above. The postscutellum consists of an external re- 

 gion (the "phragmite") and an internal portion, the phragma. 

 The external region of the postscutellum, in some insects is 

 divided into a median region, the "mediophragmite," Mph 



