302 Annals Entomological Society of America [Vol. XV, 



EXPLANATION OF PLATES.* 



Plate XIX. 



Fig. L Paeromopus lysiopetalinus. Right mandibula, ventral aspect. 



Fig. 2. Paeromopus lysiopetalinus. First pair of limbs, cephalic aspect. 



Fig. 3. Paeromopus lysiopetalinus. Second pair of legs, vestibulum (V), and 



right vulvar invagination (/), caudal aspect. l-5 = Folds of aperture 



of vestibulum. 

 Fig. 4. Paeromopus lysiopetalinus. Left vulva, caudal aspect. 

 Fig. 5. Paeromopus lysiopetalinus. Left vulva, outer profile. 

 Fig. 6. Paeromopus Chamberlini. Cardo and stipe of left mandibula, ventral 



aspect. 

 Fig. 7. Paeromopus Chamberlini. Coxae of second pair of legs of adult female, 



caudal aspect. -v=paramesal projection of coxag; 1-5= folds of 



aperture of vestibulum. 

 Fig. 8. Paeromopus Chamberlini. Right adult vulva, caudal aspect. 

 Fig. 9. Paeromopus Chamberlini. Mound and shield of right adult vulva, 



oblique caudal aspect. 



Plate XX. 



Fig. 10. Paraiulus tiganns. Anterior end of adult female. 



Fig. 11. Paraiulus tiganus. Ventral aspect of segments 1-3 of same. 



Fig. 12. Paraiulus tiganus. Cephalic aspect of second segment (A) and ventral 

 region of third (B). m = ventral ridge, and w = ventral dimple of 

 2d segment. 



Fig. 13. Paraiulus tiganus. Cardo and stipe of left mandibula, ventral aspect. 



Fig. 14. Paraiulus tiganus. Legs of second pair of adult female, cephalic aspect. 



Fig. 15. Paraiulus tiganus. Mound of left adult vulva, outer aspect. = mem- 

 branous fold replacing the operculum. 



Fig. 16. f<iraiulus tiganus. Left vulva from above. = membranous fold 

 replacing the operculum. 



Fig. 17. Paraiulus tiganus. Anterior truncation of left vulva, the opercular 

 fold of which has been removed. 



Fig. 18. Paraiulus tiganus. Left vulva of another adult female, outer aspect, 

 showing individual variations in the diverticulum, d. 



Plate XXI. 



Fig. 19. Paraiulus tiganus. Legs of second pair of larva and immature vulvae, 



caudal aspect. 

 Fig. 20. Paraiulus tiganus. Base of legs of second pair of larva, cephalic aspect. 

 Fig. 21. Paraiulus tiganus. Immature vulvae of Fig. 19, enlarged. 

 Fig. 22. Paraiulus pennsylvanicus. Anterior end of adult female. 

 Fig. 23. Paraiulus pennsylvanicus. Ventral aspect of segments 1-3 of same. 

 Fig. 24. Paraiulus pennsylvanicus. Cardo and stipe of left mandibula, ventral 



aspect. 

 Fig. 25. Paraiulus pennsylvanicus. Cephalic aspect of ventral region of second 



segment (A) and of third (B). ;v= membrane connecting the ventral 



margins of 3d segment and bearing the atrophied stemite of 2d 



legs, P2. 

 Fig. 26. Paraiulus pennsylvanicus. Right adult vulva, inner profile. 

 Fig. 27. Paraiulus pennsylvanicus. Right adult vulva, caudal aspect. 

 Fig. 28. Paraiulus immaculatus. Anterior end of adult female. 

 Fig. 29. Paraiulus immaculatus. Ventral aspect of segments 1-3 of same. 



P^ = chitinised bridge with symmetrical thickenings homologous 



to stemite of second pair of legs. 



*Camera drawings from the author. 



