18 Annals Entomological Society of America [Vol. XIII, 



The Prothorax (Fig. 1, Ti). A lateral entosternite or 

 furca (es) arises from each of the posterior ends of the inverted 

 V-shaped furcasternite (Fs) and extends across the opening of 

 the fore-leg. The flattened distal portion is closely appressed 

 to the inner face of the epimeron and entopleurite. The small 

 spina or median entosternite (es. m) is a flattened three-lobed 

 plate arising from the posterior edge of the spinasternite (Ss). 

 The greater portion of the pleuron is overgrown by the pronotum 

 and lies on the inner side of this sclerite (see DuPorte, '19). 

 The contiguous edges of the episternum (Ep) and epimeron 

 (Em) are infolded to form a deep entopleurite (ep) which 

 projects ventrally to form a ball and socket articulation with 

 the outer angle of the coxa. 



The Mesothorax (Fig. 1, T2). The median entosternite 

 (esm) or spina is a three-lobed disk attached by a short stalk 

 which projects inwards from the furcasternite between the 

 bases of the lateral entosternite (es). The proximal section 

 of the lateral entosternites is more or less cylindrical, while 

 the distal section is expanded and folded to form a pocket into 

 which fits a process from the entopleurite. The entopleurite 

 (ep) is formed from the infiexed contiguous edges of the epi- 

 sternum and epimeron. Its dorsal extremity projects beyond 

 the edges of the episternum and epimeron, forming the pleural 

 wing process. At its ventral end it gives off a spur-shaped pleural 

 process which fits into the pocket of the entosternite. The 

 two are connected by a pair of short muscles, one originating 

 from either side of the spur and inserted on the inner sides of 

 the pocket. Thus a strong arch is formed above the leg opening. 

 From this arch certain of the leg muscles originate. 



A pair of intersegmental sclerites (in), probably the pre-' 

 tergite, lies transversely in the sutural membrane between 

 the pronotum and mesonotum, the inner ends are attached to 

 the anterior edge of the mesoscutum and the outer ends extend 

 to the anterior edge of the base of the wing near the anterior 

 piece of the first axillary. There is a large basalar sclerite 

 (b.s.) and a small subalar plate (s.a.p.) 



The Metathorax (Fig. 1, T3). The endosclerites in this 

 segment are similar to those of the mesothorax, except that 

 there is no median entosternite. The intersegmental sclerite 

 (ina) comes in close contact with the posterior process at the 

 lateral end of the meso-postscutellum. There are one large and 



