LIST OF ILLUSTKATIONS. XI 



Page. 



Trichostrongylus calcaratus. Region of vulva of female viewed from right side. . 367 



Sphyradium hasta 373 



Sphymdium alticolum 373 



Animal of Sphyradium edentulum Draparnaud with the shell removed, show- 

 ing the kidney 375 



Genitalia of Sphyradium edentulum 375 



Wings of Conocoxa chalicipoda 380 



Radial venation of Nithulea nigrata 381 



Sheaths of Lycaota. a, of coloradensis Rohwer; b, of spissipes (Cresson) 384 



Apex of the sheath of Ametastegia (Emphytina) pulchella Rohwer. Figure to 



the left of the type ; to the right of the paratype 400 



Apex of the sheath of Ametastegia (Emphytina) virginica Rohwer 401 



Apex of the sheath of Ametastegia (Emphytina) pallidiscapa Rohwer 401 



Apex of the sheath and the lower gonapophyses of Ametastegia (Emphytina) cana- 

 densis (Kirby) 402 



Apex of the sheath and saw of Ametastegia (Emphytina) canadensis (Kirby) 402 



Apex of the sheath and saw of Ametastegia (Emphytina) aperta (Norton) 402 



Apex of the saw and sheath of Ametastegia (Emphytina) inornata (Say) 402 



The stigmal venation and sheath of Pseudosiobla robusta (Kirby) 403 



The stigmal venation and sheath of Pseudosiobla cxcavata (Norton) 404 



The stigmal venation and sheath of Pseudosiobla cephalanthi Rohwer 404 



Figures of the apices of the sheaths and species of Allantus. a, b, of A. cinctus 

 cinctipes (Norton); c, d, of A. cinctus nigritibialis Rohwer; c, is from the speci- 

 men from Japan; d, of the specimen from China; e, of A. gillettei (Mac- 



Gillivray) ; /, of A. cinctus cinctus (Linnaeus); g, of A. mellipes (Norton).. 407 



Variscite crystal, showing regular grouping of small particles 418 



Variscite crystal 423 



Propodeal enclosure of Tiphia canamexica 453 



Propodeal enclosure of Tiphia mexiana 453 



Apex of genitalia stipes of Bembyx primaestate 466 



Apical joints of the fiagellum of Bembyx cameroni 467 



Apex of genitalia stipes of Bembyx cameroni 467 



Apical joints of the fiagellum of Bembyx obsoleta 468 



Apical ventral plate of Bembyx obsoleta 468 



Apex of -genitalia stipes of Bembyx obsoleta 468 



Emargination of the apical ventral plate of Cerceris gandarai 470 



Emargination of the apical ventral plate of Cerceris fiavotrochanterica 471 



Antennae of Trypoxylon politiforme. Male 473 



Lateral view of the lower part of the head of Trypoxylon politum 474 



Lateral view of the basal abdominal segments of Trypoxylon politum. Female. 474 



Pygidium of female of Trypoxylon politum 474 



Lateral view of the basal abdominal segments of Trypoxylon politum . Male.. 474 



Lateral view of the basal abdominal segments of Trypoxylon basale. Male 475 



Lateral view of the basal abdominal segments of Try poocy Ion basale. Female.. 475 



Pygidium of the female of Trypoxylon politiforme 476 



Apical margin of the produced portion of the clypeus of Trypoxylon mexicanum.. 



Female seen from above obliquely 476 



Lateral view of the basal segment of Trypoxylon mexicanum. Male 476 



Head of Trypoxylon leucotrichium. Male 477 



Lateral view of the lower part of the head of Trypoxylon leucotrichium. Male. . . 477 



Lateral view of the basal segment of Trypoxylon leucotrichium.. Male 477 



Top view of frontal of Globidens alabamaensis. a, anterior end ; p, posterior end . 482 

 Inner view of posterior part of right presplenial Globidens alabamaensis. a, 



posterior or articular end 483 



