Pomona f'oi.i.KOK Joirn vi, of KsTOMouxiY 797 



slifflitly (larkiT latcnil iiun'rins. viiitriil siirtarc cdvcrcd witli lonj: white 

 flown Ifiice. I'rothorax with small lateral luhfri-les. .lt(/omfn— Smooth, iliill 

 olivp frrpcn, with ilark dorsal iiiarkirK; rfsfinblinir a letter "W". hut whieh 

 is often (lesifrnateil l>y merely a median dorsal and two lateral lontritiidinal 



darker lines, with small lateral tnhen-les, ventral surfnee s th, withont 



P')wder or Hneenlencp, dull frr<'<*n. Anal plate, rounded, larire, rouirh. hairy, 

 very dark >rroen. Coniirhs — (FiRure 252. ti). Same shape as those of the 

 winped form, olive to liurhter irreen with apieal one-(ifth darkest, lenjrth <t.27 

 mm. Legs— As in winged forms. .Sf/y/r — (Fimire 2r)2, 7^. Ensiform or 

 slitrhtly eonieal with hast widest and slifrhtly taperintr to a roumled point, 

 sickle-shaped, roiif^h, with four spines near the middle, dark olive jfrcvn, 

 li'npth 0.13 mm. (about half as lonp as the eornieles). 



Yoiiug — The younir are usually mueh liijhter in eolor. hut many of these 

 .ire very dark olive green. 



ffo.ils — This peculiar aphid inhabits plants which grow in the water and 

 is usually found near the \vati>r line. It was taken by the writer in preat 

 numbers from the common California Tule {Tiiphn Intifolin L.I cm whieh it 

 was gathered within the first foot above the water line. European writers 

 hav(> reported it on the White Water Lily CVi/"i/>A'J"J nlhn). Water I'laintain 

 {Aiistiia planlaf/o). Water (Jladiele (liiilinniia umhfllnliis). Pond Weed ( I'o- 

 fnnioftt'toii nataiis), Tiipha major, f^agitta aagitlifnlia, TI]i<lrorhnns morsus- 

 rniial, and Lnnna ffihba. In the United States it has been reported on Pond 

 Lily (.Vi/<»/>/iir(7 ndornia) in Towa, on Arrow I^caf { Saiiillnrin rnrinhill.'i) in 

 Colorado, by Cowen, on Philolria ratinrhnsr. Calla. and Lcmna sp., in Illinois, 

 by Davis, and on Pnhfrjouiim sp. in California by Davidson. 



LnraJihi — Taken on Tules growing in the water along the banks of the 

 Santa Clara River about three miles east of Santa Paula, Cal. 



Dntr of coUrction — It exists throughout the latter part of the sununcr 

 and was collected August 28. 1011. Serial number "il. 



Though this insect inhabits plants whieh grow in the water it has never 

 been able to escape a host of enemies in the form of the larva* of Syrphiil 

 flies and internal parasites, which are constantly destroying them. 



