INTRODUCTION. 



detachment of the side pieces (fig. 8, a. a) from the notum and 

 their great development. In many species these side pieces 

 completely overlie the presternum. The mesothornx consists of a 

 broad, generally convex plate, the viesonotum (fig. 6, t-, & fig. 7, h) ; 

 a posterior portion, the scutum or scutellum (tig. 6, h,& fig. 7,/); 



Fig. 6. —Stiliitx aureo.icricens. Side view of alitrimk or thorax and median 

 segment, much enlarged, a. prosternuui ; b, pronotiim ; c, niesouotum ; 

 d, parapside of mesonotum ; e, tegula ; ./', site of articulation of fore wing ; 

 ff, site of articulation of hind wing ; h, scutellum ; /, episternum ; _/, 

 epiuieron (i&J united form the mesopleuron); k, postscutellum or anterior 

 portion of metanotura; w\ posterior portion of nietanotum; /, episternum; 

 m, epimeron (/ & m united form the metapleuron) ; n, 1st true abdominal 

 segment, the median segment or propodeum ; o, false stigmata; p,p^,]i'^, 

 coxae of legs ; q, funiculus. 



Fig. 7. — Thorax seen from above, a, pronotum ; b, mesonotum ; c, c, parapeides 

 of mesonotum ; d, d, tegulse of lore wings; /, scutellum ; (/, postscutellum ; 

 h}, /«', posterior portion of melanotum ; h, median segment; y, /, false 

 stigmata; A*, funiculus. 



Fig. 8. — Thorax from below, a, a, side pieces of prothorax oyerlying the 

 presternum; b b, d d, g g, sites of articulation of the legs; c,c, meso- 

 sternum ; f,f, metasternum ; h, ventral plate of median segment. 



side pieces, the episternum (fig. 6, i) and epimeron (fig. 6,^), these 

 two united making up the mesopleiiron ; and lastly the meso- 

 siernum (fig. 8, c, c). The mesonotum is frequently divided by 

 oblique longitudinal grooves, the side pieces being called the 

 parapsides (tig. 6, d, & fig. 7, c, c). The metathorax similarly has 



