Pomona College JouRNAii op Entomology 797 



slightly (hirkiT Jatci-Ml iiiMrgiiis, vi'iitral surfiu-u i-uvcrcd with long white 

 floecnleiicp. Prothorax with small lateral tubercles. Abdomen — Smooth, diill 

 olive green, with dark dorsal iiiarking resemliling a letter "W", hut which 

 is often designated liy merely a median dorsal and two lateral longitudinal 

 darker lines, with small lateral tubercles, ventral surface smooth, without 

 powder or tlneeulenee, dull green. Anal plate, rounded, large, rough, hairy, 

 very dark green. Connclcs — (Figure 252, fi). Same shape as those of the 

 winged form, olive to lighter green with apical one-fifth darkest, length 0.27 

 mm. Legs— As in winged forms. S'/y^e— (Figure 252. 7). Ensiforni or 

 •slightl.v conical with base widest and slightly tapering to a rounded point, 

 sickle-shaped, rough, with four spines near the middle, dark olive green, 

 length 0.13 mm. (about half as long as the cornicles). 



Youvg — The young are usually Tnueh lighter in enlnr. but many of these 

 are very dark olive green. 



Hosts — This peculiar aiiliid inhabits jilants which grow in the water and 

 is usuall.v found near the water line. Tt was taken by the writer in great 

 numbers from the common California Tule (TjipJia lafifoJin L.) on which it 

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

 have reported it on the White Water Lily {Nfnnphnca alha). Water Plaintain 

 (A]is)iin planfafin). Water Gla<linle (Bidonuia unilxUaiKs) . Pond Weed {I'o- 

 famnrirtoii nataiis), T}iphn major, Sagitta sagittifolia, Hydrockaris morsus- 

 ranal, and Lennia gihha. In the TTnited States it has been reported on Pond 

 Lily (Nyiiiphara odorata) in Iowa, on Arrow Leaf {HagUiarin rnrinhilis) in 

 Colorado, by Cowen, on Philotria canadense, Calla, and Lemva .sp., in Illinois, 

 b.V Davis, and on Poh/gonuiii sp. in California by Davidson. 



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

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



Date of collection — It exists throughout the latter part of the summer 

 and was collected August 28, 1911. Serial number 51. 



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

 been able to escape a host of enemies in the form of the larvfe of Syrphid 

 flies and internal parasites, which are constantly destroying them. 



