iA 



Ayinah Entomological Society of America [Vol. XII, 



Army Worm: Upon examining the head capsules of lepidop- 

 terous larvae under a low-power lens, several minute circular 

 light spots were seen; these spots resemble hair sockets from 

 which the hairs have been removed, but former studies dealing 

 with similar spots at once suggested that they might be the 

 olfactory pores, so common to adult insects and coleopterous 

 larvae. Upon examining them under a high-power lens, it was 

 soon observed that their external anatomy is different from 

 that of hair sockets and sections through them proved that they 

 are really olfactory pores. 



Figs. 1 and 2. — Disposition of the pores or punctures and setae on the head of a 

 small army worm {Cirphis nnipuncta Haw.), only the pores being here named, 

 X 20. Fig. 1, dorsal view and Fig. 2, ventral view. Frontal pore {Fa); 

 adfrontal pore {Adfa)\ anterior pore (.4a); posterior pores a (Pa) and b (Pb); 

 lateral pore (La); ultraposterior pores a {UPa) and b (UPb); labral pore 

 (Lra); mandibular pores a {Mda) and 6 (Mdb); maxillary pores a (Mxa), c {Mxc), 

 d (Mxd), e (Mxe), and/ to 7 (Mxf to j); labial pores a to c (Lba to c); antennal 

 pore (Anta); genal pore (Ga); ocellar pore (Oa); subocellar pores a (SOa), 

 b {SOb) and c (SOc); secondary setae {Ai and A2); and Nagel's so-called 

 olfactory pegs on antennae (THr). 



Referring to Figures 1 and 2, it is seen that they are always 

 paired and they are located and named as follows : On the front : 

 the frontal pore (Fa); on the adfrontal piece: the adfrontal 

 pore (Adfa); on the dorsal sureface of the epicranium: the 

 anterior pore (Aa), posterior pores a (Pa) and b (Pb), lateral 

 pore (La), and ultraposterior pores a (UPa) and b (UPb); on 

 the ventral surface of the epicranium: the genal pore (Ga), 



