THE CANADIAN ENTOMOLOGIST. 18^ 



The following alphabetical list sho\YS the genera to which the 

 described species are here referred, with initial bibliographical references: — 

 Anabrus coloradus Thom.. Rep. Hayd. Surv., V., 440 {Afiabrus.) 



n haldemanii Gir., Marcy Expl. Red Riv., 259 [248], pi. 15, 



figs. 5-8 {Orchesticics). 

 „ minutus Thom., Proc. Philad. Acad., 1870, 1875 {Or chest icus). 

 n purpurascens Uhl., Proc. Ent. Soc. Philad., II., 550 {Anabrus). 

 u similis Scudd., Hayd. Rep. Nebr., 249 {Anabrus). 



simplex Hald.. Stansb., Expl. Utah, 372, pi. 10, fig. 4 {Anabrus). 



„ stevensonii Thom., Proc. Philad. Acad., 1870, 1875 {Or chest icus). 



Arytropteris steindachneri Herm., Verh. Zool.-bot. Ges. VVien, XXIV., 



204-205, figs. 98-102 {Tropizaspis). 

 Decticus derogatus Walk., Cat. Derm. Salt. Brit. Mus., II., 260 {Atlan- 



ticus pachymerus). 

 n dorsalis Burm., Handb. Entom., II., 713 {At/anticus). 

 „ pachymerus Burm., Handb. Entom., II., 712 {Atlanticus). 

 ,. pallidipalpusThom., Fin. Rep. Hayd. Surv., V., 442 {Steiroxys). 

 „ sphagnorum Walk., Cat. Derm. Salt. Brit. Mus., II., 258-259 

 (Not a Decticid). 

 Idiostatus californicus Pict., Mem. Soc. Phys. Gen., XXX., vi., 64-65, 



figs. 35, 35a {Idiostatus hermanni). 

 Orchesticus americanus Sauss., Rev. Mag. Zool., 1859, 201 {Orchesticus). 

 Plagiostira albonotata Scudd., Ann. Rep. Wheel. Surv., 1876, 501 {Pla- 



giostira). 

 Steiroxys bilineata Thom., Fin. Rep. Wheel. Surv., V., 905 {Idiostatus). 

 M hermanni Thom., Fin. Rep. Wheel, Surv., V., 904, pi. 44, fig. 



4 {Idiostatus). 

 „ melanopleura Scudd., Ann, Rep. Wheel. Surv., 1876, 500 



{Clinopleura). 

 Thamnotrizon scabricoUis Thom., Fin. Rep. Hayd. Surv., V., 441 



{Peranabrus). 

  , trilineatus Thom., Proc. Philad. Acad., 1870, 1S76 



{Steiroxys). 

 Thyreonotus cragini Brun.. Bull. Washb. Lab., I., 129 {Orchesticus). 



M scudderi Brun., Bull. Washb. Lab., I., 129-130 {Orchesticus). 



All known North American Decticidse are apterous or subapterous, 



their tegmina never extending over more than two abdominal segments or 



thereabouts. But many European species are fully winged, and such 



