Pomona College Joibnal ok Entomolooy 741 



so \i>ufi .-IS mII <if \1, liut is li>ii;;rr lli.iii tin s|>ur; I \' is slightly xliortrr tlinn \'. 

 I)iit llirsc i\r<- approximately Mil>fi|ii.-il ; \' I is not so long as I \' and \' togctlirr. 

 tlioii^li niuc-li longer than either; the spur is not (|iiite twiee so long ns the base 

 and is not so long ns the base and \' together. On artiele III there is usually 

 a single row of circular sensoria, usually from four to tive, but often with but 

 two and again with seven, as shown in the drawing; \' has large sensorium near 

 apical end and sevi-ral (one large aiul six small) in the prociss of \'I. liiislrum — 

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

 or lighter with dark hairy tip. /'r«//(ornj- — With rounded lati'r.il tubercle ( |-'igure 

 -2.'<(), ).), much wider than the head ami about as wide, with light anterior portion 

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

 Ihorax — Light at anterior end, one-third with dark lateral spot on each margin, 

 with also a basal lateral dark blotch which extends <in to the mctathornx, and a 

 l.'irge dark median basal blotch covering nearly the entire dorsum. Melalhorax — 

 With a continu.-ition of the black blotch from the mesothorax and two median 

 tr.-msversi- dark bands near the basal border which do not touch in the middle. 

 .Ilxlomfii "\\'i{h a \niiform pale color of from almost transparent white to a flesh, 

 rose, gray or le;id color, with a row of lateral dark spots at the union of the seg- 

 ments ,'ind a median dark band on tlu' last segment and a dark-tipped style. 

 \'entr.il surface of a uniform color such as the ground color of the dorsum, it is 

 more liable to be pruinose. With large semi-globular lateral tubercles ( |-"igurc 

 •2^C). (i) as described in the winged form. .Vnal plate well rounded, dusky, hairy. 

 Cornicles — Kntirely wanting. I.rgs — Rather stout and hairy; cox* light yellow, 

 pruinose; femora yellow with Husky tips; tibia* amber brown with dark brown 

 tips; tarsi dark brown. Slf/lf — Short, rounded, dull grayish-brown, hairy. 



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

 what lighter. 



Both the winged .inil .iptrrous foriiis .are r.'itlier slow .iiid sluggish in tiieir 

 movements, but droj) from the roots as soon as they are disturbed. 



Host — Taken from the roots of the conunon Willow {Salix larrinala Hebb. ), 

 near tlu' surf;ice and as far as from fourteen inches under ground. They arc 

 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 c<ilonies. but 

 may also be very scattered (Figure 'i:i~). 



Locality — .\long the banks of the Santa Clara River, near .Santa I'aula, Cal. 



Date of Collection — .\ugust 1(>, IJdI. .\pterous forms were f;iirly abundant, 

 but the winged fem;iles se.'irce. .Vssoci.'ited with .•mother .Vphid. No. II, .Seri;il 

 number 'Jd. 



Thomasia crucis n. sp. 



WIX<iEI) VIVII'AKOIS KE.MALK ( KigUrc 4.S8 A) 



Length of body 1.'2 nnn., width of the nicsothornx ()..S.'» mm., width of the 

 abdomen (t..")i nun., wing expansion .1.81 mm. Bodfi — .Small, distinctly marked 

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

 Prevailing color- — Rich green a!id black. Head — Large, rounded in front, nearly 

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



