. Annals of the Entomological Society of America. Entomology. 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 21 22 Figs. 8 to 28.—Disposition and external view of pores or punctures on same army worm a
. Annals of the Entomological Society of America. Entomology. 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 21 22 Figs. 8 to 28.—Disposition and external view of pores or punctures on same army worm as 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
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