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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 94 



treme sclerites (B, o, q) extend forward in the walls of the phallo- 

 treme cleft from the bases of their respective processes {n, p). 

 Anterior to the phallotreme a tubular meatus (A) leads into the cavity 

 of the endophallus, and the ejaculatory sac {ejs) opens between large 

 gonopore processes {y) into the small spermatophore sac {sps). The 

 phallotreme cleft in the proximal part of the dorsal lobe of the aedeagus 

 has its lateral walls strengthened by a pair of thin oval plates (fig. 

 41A, B,t/). 



The foregoing studies of three species of Melanoplus suggest that 

 the phallic structures will be found to be more variable and more spe- 

 cialized among the Melanopli than in the other acridid groups. 



ABBREVIATIONS USED ON THE FIGURES 



aAp, anterior sternal apodeme. 



iied, aedeagus. 



AcGl, accessory genital gland. 



acs, antecostal suture. 



aiv, anterior intervalvula. 



AN, alinotum. 



An, anus. 



Ap, apodeme. 



Apa, apodeme of aedeagus. 



a^t, acrosternite (precostal lip of 



sternum). 

 atg, acrotergite (precostal lip of 



tergum). 



bf, basal phallic fold. 

 Bs, basisternum. 



Cer, cercus. 



Cln, colon. 



CpCls, cap cells of sense organ. 



CxC, coxal cavity. 



C.vpd, coxopodite (limb basis). 



Dej, ductus ejaculatorius. 



dil, lateral internal dorsal muscles. 



dim, median internal dorsal muscles. 



dl, dorsal lobe of aedeagus. 



DMcl, longitudinal dorsal muscles. 



DS, dorsal sinus. 



DV , dorsal blood vessel. 



eg, egg guide. 

 cjs, ejaculatory sac. 

 Enph, endophallus. 

 Epm, epimeron. 



Epph, epiphallus. 

 Eppt, epiproct. 

 Eps, episternum. 



GC, genital chamber. 

 Gpr, gonopore. 



//, ileum. 



IXSL, genital lobe of ninth abdominal 



sternum. 

 lAp, lateral sternal apodeme. 

 Ic, external lateral muscles. 

 //, internal lateral muscles. 

 1st, lalterosternite. 

 Itg, laterotergite. 



Nv, nerve. 



Ode, oviductus communis. 



OdI, oviductus lateralis. 



Ovp, ovipositor. 



Pa, postalar arm of postnotum. 



Pal, pallium. 



Pal' , inner fold of pallium. 



Papt, paraproct. 



paptl, lobe of paraproct. 



Ph, phragma. 



Phi, phallus. 



Phtr, phallotreme. 



piv, posterior intervalvula. 



PI, pleuron. 



PIS, pleural suture. 



PlVlv, pallial valve. 



PN, postnotum. 



