NO. 1687. THE THORAX OF INSECTS— SNODdRAl^S. 5g7 



Fc, furca or entosternum, 



Fr, freiuilUDi. 



(j, median groove of uotum. 



(Ju, gula. 



H, head, or base of head. 



HI, halter. 



IPh, phraguia of first abdominal torgum. 



IS-XS, first to tenth abdominal sterna. 



18i>, JISp, first and second abdominal spiracles. 



IT-XT, first to tenth abdominal terga. 



Ju, jngnm. 



M, media or fourth vein of wing. 



Mb, intersegmental membrane. 



mb, membranous area In prescutum of Ooleoptera. 



MD, muscle disc. 



Mes, mesothorax. 



Met, metathorax. 



Mi, microthorax. 



mi, cervical or microthoracic sclerites. 



A'^, notum. 



A A, notal (psendopleural) internal arm of pronotnm of Melanoplus. 



NCxP, notal (pseudolpleural) coxal process of prothorax of Melanoplus. 



NR, internal notal (pseudopleural) ridge of prothorax of Melanoplus. 



P, parapterum. 



IP, 2P, first and second preparaptera or episternal paraptera. 



3P, postparapterum or epimeral i)arapterum. 



PA, pleural arm of the internal pleural ridge. 



PD, parapteral or pronator muscle disc. 



Peps, preepisternum. 



Ph, phragma. 



PI, plate in pleurum of Chilopoda. 



P2V, pseudonotum or postnotum (postscutellum). 



PNP, posterior notal wing process. 



PNR. posterior notal ridge. 



p n r, line on the surface of notum formed by PNR. 



Pph, posterior phragma or postphragma of each segment. 



PR, pleural ridge (pleural apodeme, entopleurum). 



PS, pleural suture, between episteruum and epimerum forming pleural ridge 



(PR) internally. 

 Ps, presternum, or presternal plates. 

 psc, prescutum. 



R, radius or third vein of wing. 

 Rd, posterior reduplication of edge of notum. 

 8, sternum. 



IS-XS, first to tenth abdominal sterna. 

 Sc, subcosta or second vein of wing. 

 sc-l, scutellnm. 

 set, scutum. 

 SI, sternellum. 

 Sm, submentum. 

 Sp, spii'acle. 



1 Sp, 2 Sp, first and second thoracic spiracles. 

 / Sp, II Sp, first and second abdominal spiracles. 

 2\ tergum. 



