78 



Annals Entomological Society oj America [Vol. XII, 



same author (1918) continued this study using the genus 

 Opostega. 



Busck (1917) mapped most of the punctures present on the 

 head capsules of the pink bollworm {Pectinophora gossypiella 

 Saund.) and the scavenger bollworm {Pyroderces rileyi Wals.). 

 He found 22 punctures on each capsule, while the present 

 writer found 20 on the former capsule; in all probability there 

 are 26 on each capsule. 



21 22 



Figs. 8 to 28. — Disposition and external view of pores or punctures on same army 

 worm as repre.sented in Figs. 1 to 7. Figs. 8 and 9, disposition of pores on 

 dorsal and ventral surfaces, respectively, of left maxilla, X 50. Maxillary 

 pores a to ; {Mxa to j). Figs. 10 to 28, external structures of pores and setae, 

 X 320. Fig. 10, ventral surface of second and third segments of maxillary 

 palpus, showing maxillary pores/ to 7 {Mxf to j) and tactile hairs (THr) at 

 tip of palpus. Fig. 11, tibial pore; Fig. 12, thoracic pore c; Fig. 13, abdominal 

 pore; Fig. 14, anal-proleg pore b; Figs. 15 and 16, maxillary pores d and b, 

 respectively; Fig. 17, labral pore; Fig. 18, mandibular pore a; Figs. 19 and 20, 

 labial pores a to c, drawn in proper relation to each other; Fig. 21, frontal 

 pore; Fig. 22, adfrontal pore; Fig. 23, lateral pore; Fig. 24, subocellar pore c; 

 Fig. 25, ultraposterior pore b; Fig. 26, antennal pore; Fig. 27, secondary seta 

 (Fig. 5, ^3) on prothorax; and Fig. 28, secondary seta (Fig. 1, .42) on head. 

 Pore aperture (Ap); pore border (5); and pore wall (W). 



2. External Anatomy of Pores or Punctures. 



Under a high-power lens it is observed that a pore usually 

 has a dark border (Fig. 2\, B) which may be round, oblong or 

 occasionally almost diamond-shaped, and it may show indica- 

 tions of radial streaks. Inside the border lies the wall {W) 

 which is usually dark and heavy; it is the most conspicuous 

 part of the organ and may be round or oblong. Inside the wall 

 the chitin is lighter in color and at the center may be seen an 



