148 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



Table 3. — (Continued) 



3. Preorthopteroids 



Less isps-2ils, ssps-sils; convert 2sps-3ils to 2sps-Iils 



Blattoid-Orthopteroid-Psocopteroid composite (4) 



4. Blattoid-Orthopteroid-Psocopteroid composite 



Less 2sps-fui Preblattids (5) 



Less 2sps-Iils, 2sps-3sps, 3sps-Isps, ^sps-cxs 



Orthopteroid-Psocopteroid composite (8) 



5. Preblattids 



Modify 3sps-cx3 to fus-cx, Blattar iae 



Less isps-2sps, 3sps-Isps 



Isoptera-Grylloblattodea-Mantodea composite (6) 



6. Isoptera-Grylloblattodea-Mantodea composite 



Less 2sps-iils, 2sps-Iils, 2sps-3sps, icv-cxiX Isoptera 



Less isps-cxi Mantodea-Grylloblattodea composite (7) 



7. Mantodea-Grylloblattodea composite 



Less isps-jui, 2sps-2Us, 2sps-cxs, 2sps-Iils, 2sps-jiii Mantodea 



Less isps-cpsz, 2sps-cx2, 2sps-3sps, 3sps-jii3, 3sps-Iils Grylloblattodea 



8. Orthopteroid-Psocopteroid composite 



Less isps-iils Orthoptera 



Less isps-epSi, 2sps-cx2 Psocoptera-Plecoptera complex (9) 



9. Psocoptera-Plecoptera complex 



Less 2sps-2ils Psocoptera 



Less isps-ssps, 2sps-fut, 2sps-cpS3, 3sps-fus, 3sps-Iils Plecoptera 



10. Preneuropteroids 



Less icv-cxjX Megalopteroid-Coleopteroid complex (11) 



Less ISpS-CXi, ISpS-CpSz, ISpS-CXt ISpS-2iIs, ISpS-jtU 2SpS-CXi, 2sps-2ils, 

 2SpS-epS!, 2SpS-CXs, 2SpS-3ils, 2SpS-lUs, 2SpS-jU,, 3SpS-CXs, 3sps-Iils, 



3sps-Si, 3sps-2ils, 3sps-ju2 Mecoptera 



11. Megalopteroid-Coleopteroid complex 



Less isps-2ils, 2sps-fui, 3sps-2ils, 3sps-fih Megaloptera 



Less isps-cpst, 2sps-cpss, 2sps-fui, 3sps-Iils, 3sps-Si 



Coleoptera-Neuroptera complex (12) 



12. Coleoptera-Neuroptera complex 



Less 2sps-fuz, 3sps-fti3 Coleoptera 



Less isps-cxt, jsps-fut, 2sps-2ils, 2sps-3ils, 3sps-cxs, 3sps-3ils, 3sps-2ils, 

 3sps-jui Neuroptera 



SUMMARY 



Comparison of the spinaslernal musculature of the Thysanura and 

 24 orders of pterygote insects leads to the following conclusions in 

 regard to their relationships : 



1. The Thysanura are close to the ancestral pattern, but not in the 

 direct line of pterygote descent. 



2. The Pterygota may be divided naturally into two large series 

 that include the orthopteroid and neuropteroid orders respectively, 

 plus a number of orders of uncertain position. 



3. The orthopteroid series includes the Blattariae, Isoptera, Man- 



