GLAND-ORIFICE. The external opening through which a gland pours 

 its secretions. 



GLAND-SPINES. Spiny appendages each of which is supplied with 

 a single gland whose orifice is at the tip. Other authors have 

 called all appendages of this nature " plates," " squames," 

 " scaly hairs/' without distinguishing between the fimbricated 

 appendages of Aspidiotus, Parlatoria and certain other genera 

 (Plate 4, Figs. 3 and 4) which are not supplied with glands and 

 the spine-like appendages here described. Gland-spines are 

 shown on Plate 4. Fig. 5 H, and also on Plate 6, Figs. 5 and to. 

 For the sake of brevity a formula has been adopted in giving 

 the number of the gland-spines on the pygidium. Thus in the 

 description of Chionaspis salicis^ the formula for the gland-spines 

 is given as i, 1-2, 1-2, 1-2, 3-7, which means that the first group 

 outside of the median lobes contains one, the second, third and 

 fourth one or two each, and the fifth from three to seven. 



LOBES. When lobes are present in the Diaspinae they occur at the 

 extremity of the body and are in pairs, there being one pair to 

 each of the transformed segments. Where one pair is present it 

 occurs on segment twelve ; where two pairs are present, on seg- 

 ments eleven, twelve etc., each additional pair being placed on 

 the next anterior unoccupied segment. The terminal pair (Plate 

 4, Fig. 5 K) is designated as the first or median pair. The 

 others are designated as second, third and fourth pair, etc., 

 according to their position as second, third and fourth from the 

 median pair. See Plate 4, Fig. 5. In the two genera of this 

 paper the second and third pairs, which are the only ones that 

 occur beside the median pair, each lobe is composed of two 

 distinct lobules. See Plate 4, Fig. 5 L and M. 



LOBULE. See lobes. 



MARGINAL GLAND-ORIFICE. Ori the margin of the pygidium are 

 other gland-orifices precisely like the dorsal gland-orifices except 

 for position. These are designated as the marginal gland- 

 orifices and there are two to each of the transformed segments 

 except near the median line where they are less numerous and 

 more variable. These are represented on Plate 4, Fig. 5 E. It 

 will be seen that part are directly on the margin and part are a 

 little back from the edge. 



