Pomona College .Journal of Entomology 741 



so loiij; as all of \' I . hut is loiijrcr than the spur; I \' is slifrlitly shorter than \', 

 hut tlifsi- arc a|)|)r()xiMiatcly suhf(|u;il ; \'I is not so lonj; as IV' and V together, 

 though nnich longer than either; the sjjur is not (juite twice so long as tlie base 

 and is not so long as the base and V together. On .irtiele III there is usually 

 a single row of circular sensoria, usually from four to five, hut often with hut 

 two and again with seven, as shown in the drawing; V has large sensoriuni near 

 a))ical end and several (one large and six small) in the i)rocess of VI. Uoslruin — - 

 Nearly as long as the body, and in the younger forms longer, color of the body 

 or lighter with dark hairy ti)>. Prothorajc — With rounded lateral tubercle ( I'igure 

 liJ.'U), !•), nuich wider than the head and about as wide, with light anterior portion 

 and dull gray basal two-thirds, with lateral dark spot on each basal side. Meso- 

 Ihorcrv — Light .at anterior end, one-third with dark l.atcr.il spot on each m.irgin, 

 with also a basal lateral dark blotch which extends on to the nietathorax, and a 

 large dark median basal blotch covering nearly the entire dorsum. Metathorax — 

 With a continuation of the bl.iek blotch from the mesothorax and two median 

 transverse dark bands near the basal border which do not touch in the middle. 

 Abdomen — With a uniform ])ale color of from almost transparent white to .-i flesh, 

 rose, gray or lead color, with .1 row of later.il dark siwts at the union of the seg- 

 ments and a median d.irk band on the last segment and a dark-tipped style. 

 V^'ntral surface of .1 uniform color such as the ground color of the dorsum, it is 

 more liable to be pruinose. With large semi-globular lateral tubercles (Figure 

 ^.'i(i, (i) as described in the winged form. Anal plate well rounded, dusky, hairy, 

 Cornicles — Entirely wanting. Legs — Rather stout and hairy; cox* light yellow, 

 |)ruinose; femora yellow with dusky ti|)s ; tibiie amber brown with dark brown 

 ti|is; tarsi dark brown. Sti/le — Short, rounded, dull grayish-brown, hairy. 



Young — The young resemble the adult apterous females in color, being some- 

 what lighter. 



Both the winged and apterous forms are rather slow and sluggish in their 

 movements, hut dro]) from the roots as soon as they .are disturbed. 



Host — Taken from the roots of the common \\'illow (SalLr laeingata Bebb.), 

 near the surface and as far as from fourteen inches under ground. They are 

 found in light sandy soil along the river banks. It is a bark feeder and no forms 

 were found above ground. They occur in rather large and compact colonies, but 

 may also he very scattered (Figure 287). 



Localiti/ — Along tlie hanks of the Santa C'lar.-i River, near .Santa Paula, Cal. 



Date of Collection — August Hi, ipil. Apterous forms were fairly abundant, 

 but the winged fem.iles scarce. Associated with another Aphid. No. 11. Serial 

 number 20. 



Thomasia crucis n, sp. 

 WINGED VIVIPAROUS FEMALE (Figure 238 A) 

 Length of body 1.2 mm., width of the mesothorax 0.3r> mm., width of the 

 abdomen 0..3 !• mm., wing expansion 3. St mm. Body — Small, distinctly marked 

 and colored, covered with long curved spines, flat, and rather short, but wide. 

 Prevailing color — Rich green and black. Head — Large, rounded in front, nearly 

 as long as wide, without antennal tubercles, dorsum very dark olive green to 



