270 Annals Entomological Society of America [Vol. X, 



Figure 14 is the curve of Eriococcus missourii species novo. It is further 

 characterized by the peculiar striped, dermal, color markings of the females. The 

 antennal formula for the mean curve is 437256. The first segment is not consid- 

 ered, because of the difficulty in measuring its length. 



Figure 15 is the graph of a variation of Eriococcus missourii species novo. It 

 apparently is a six segmented form, the third joint being the longest and about 

 equal to segments Nos. 3 and 4 of the seven segmented form. The antennal formula 

 for the mean curve of the six-segmented form is 36254. The first antennal 

 segments are not plotted. 



Figure 16 is the curve of Pseudococcus nipa (Mask.) a very pretty, sedentary 

 mealy bug. The antennal formula for the mean curve of this species is 72(13)645. 



Figure 17 is the graph of Gossyparia spuria (Modeer) collected on elm in 

 Michigan. It is not indigenous to Missouri so far as the writer knows. The anten- 

 nal formula for the mean curve of this species is 342756. 



Figure 18 is the graph of Lecanium spp. non det. fovmd in large numbers upon 

 ash. The antennal formula for the mean curve is 3471265. 



Figure 19 shows the curves of another Lecatmim, L. spp. non det. found 

 abundantly upon elm. The antennal formula for the mean curve is 3472165. 



Plate XXI 



Figure 20 represents the antennal segments of Pseudococcus shaferi species 

 novo, found upon annuals and perennials, and also hibernating under the rough, 

 exfoliating bark of wild grape. This particular curve was formerly thought, by 

 the writer, to belong to a distinct species, but subsequent examination and com- 

 parison of the material with that which was used to produce the curves in the 

 next figure, showed conclusively that it was the same species. No mean curve is 

 shown in this figure, because that of Figure 21 applies to this, as well. 



Figure 21 is the graph of Pseudococcus shaferi species novo. It is further 

 characterized by the cerarii, etc. The antennal formula for the mean curve of the 

 adults of this species is 82137(56)4. Figure 23 is the graph of the nymphs' anten- 

 nae. The antennal formula for the mean curve of the antennae of the nymphs 

 is 632154. 



Figure 22 is the graph of the antennal segments of Pseudococcus Jessica Hol- 

 linger. Descriptions and figures of this species are given in the Canadian Ento- 

 mologist for December, 1916, and for January, 1917. The antennal formula for 

 the mean curve of this species is 8(12)37564. 



Figure 23 (See legend as given under Figure 21). 



Figure 24 is the graph of Pseudococcus morrisonii species novo, collected from 

 white hickory. It is further characterized by the cerarii. The antennal formula 

 for the mean curve of this species is 81237654. 



Figure 25 is the graph of Pseudococcus mcdanieli species novo. This species 

 is further characterized by forming an ovisac of white, fluffy filaments which often 

 completely cover the body of the adult female; also by the seven segmented 

 antennae, by the cerarii, etc. Ragweed, Ambrosia trifida, seems to be its most 

 preferred food plant. The antennal formula for the mean curve is 713(24)65. 



Figure 26 is graph of the nymphal stage of Trionymus americanus (Ckll.). 

 This species is a grass feeding coccid. The antennal formula for the mean curve 

 of the nymphal antennae is 7126435. 



Figure 27 is the graph of the adults' antennae of the species, Trionymus 

 americanus (Ckll.). This species is further characterized by having cerarical 

 spines only on the ultimate and penultimate segments. The antennal formula for 

 the mean curve of the adults' antennal measurements is 81273564. 



