Pomona ColIjEge Journal of Entomoi-ogy 767 



spur ().()() mm.) ; tdtal O.fidl mm. I iuid Tl arc usually ciiual in Icufjtli, tliout,'li 

 the latter is more often longest, ITI is ecjual to TV and V together, and VI with 

 the S])ur is longer then either TV or V. Rostnan — Reaches nearly to or slightly 

 beyond the second eox:i', transparently white with extreme tip dusky. Thorax 

 — Very pale green or yellow with two darker green dorsal spots. Abdomen — 

 Deeply segmented, and very rough, due to the large glandular tuhereles, pale 

 yellow with darker green dorsal hand across the base and a small green patch 

 just in front of the base of the style. Anal plate (Figure II) as in the winged 

 female. Cornicles — (Figure 7). Same as in winged form except that they 

 are yellow throughout. Legs — Very light yellow or transparently white 

 throughout. Style — (Figure 12). As in winged form, but slightly larger, 

 yellow, length 0.08 mm. 



Young — Are very light in color, varying from a pale whitish or yellow to 

 light faded green. The entire body is covered with long glandular hairs, each 

 of which is situated on quite a large body tubercle. 



Host — This species is not plentiful, except in a very few instances. On 

 nearly every Alder tree (Alviis rhoiiihi folia Nutt) there may be found a few 

 individuals on the under sides of the leaves. On one small tree in the Santa 

 Paula Canyon there were to be found thousands, the entire lower surfaces of 

 the leaves being covered, but even here the winged individuals Mere very 

 scarce. The presence of the insect is easily told by the smutting of the foliage 

 of all infested trees. 



Locality — On the trees growing along all of the streams in the vicinity of 

 Santa Paula, California. 



Date of Collection — August 16, 1911. Serial number 27. 



MONELLIA californicus n. sp. 

 (Wild-walnut Plant-louse) 



wnsTGED viviPAEOTTs FEMALE (Figure 244, A) 



Length of the body including the style, 2 mm., width of the mesothorax 

 O.f) mm., width of the abdomen at widest place near the middle 0.85 mm., wing 

 expansion 5.5 mm. A medium-sized plant louse. Prevailing color — Rich saf- 

 fron yellow varying to a much lighter shade, with dark appendages. Head — 

 Rounded anteriorly and base straight, nearly the shape of a half circle, yellow 

 with a black longitudinal stripe ventrally at the base of each antenna (Figure 

 D) and two short black stripes extending from the front backwards between 

 the bases of the antenuiP. Eyes — Large, light with red centers. Antennae — 

 (Figures D, G, H) considerably longer than the body, slightly imbricated: 

 article I lemon yellow with inner apical margin dark, IT lemon yellow with 

 dark 'nner margin and dark apical tip : remaining articles dark (almost black) 

 throughout ; lengths : I, 0.12 mm. ; II, 0.09 mm. ; III, 0.68 mm. ; IV, 0.5 mm. ; V, 

 0.45 mm. ; VI, 0.45 mm. (spur 0.18 mm.") : total 2.29 mm. From these measure- 

 ments it will be seen that I is longer than IT, ITI much the longest, IV a little 

 longer than V, V and VI sub-equal (IV, V and VT nearly all equal), the spur 



