SCLERITES OF PROTHORAX 



19 



(the sella of Lowne). Two lobes at its anterior end are covered 

 with small processes, probably sensory in function. A pair of small 

 sclerites is situated in front of these lobes; these sclerites with 

 the interclavicle no doubt belong to the prostemnm. The inter- 

 clavicle is ventral to the cephalothoracic foramen. The ju^ulares 



^P ^' mts 

 cp. 



Fig. 6. The thorax seen from the left side. The in.sertions of the larger setiie are 

 shown; for the sake of clearness the sclerites of the wing-base .are omitted. 



a.th. Anterior thoracic spiracle. ca. Costa. cp. Intermediate coxal plates. 

 ep'., ep". Epimera of the meso- and meta-thoracic segments, eps'., eps"., 

 eps'" . Episteraa of the pro-, meso-, and meta-thoracic segments, hal. Haltere. 

 hu. Humerus. Ip. Lateral plate of mesostemum. Ip.^c. Lateral plate of 

 postscutellum. mph. Mesophragma. mp^c. Median plate of postscutellum. 

 mn. Metanotum. mx. Mesostemum. /»fx. Metasternum. p.th. Posterior 

 thoracic spiracle, pt. Parapteron. pr.n. Pronotum. prs. Preseutum of meso- 

 thorax. sc. Scutum, sctl. Scutellum. 



(3me jiigulaires of Kunckel d'Herculais) are two prominent 

 pocket-shaped sclerites lying one on each side of the cephalo- 

 thoracic foramen, and having their convex faces external. Lying 

 immediately belov*^ each of the jugulares is a small rod-like 

 sclerite — the clavicle. The dorsal region of the prothorax, the 

 pronotum (fig. 6, pr.n.), is formed by two sclerites united in the 



2—2 



