Pomona Colleoc Journal of Entomoloov 731 



Symdobius salicicorticis n. ?.p. 



(The Willow Hark F-ousc) 



WINGED viviPAUoi's KKMALK ( Fifjure 23 V A) 



I.t'ii);tli 'J.I' linn., widtli of iiu-sotlior.ix 0.7 liilii., width of tlic alxioiiirii, l.l.'i 

 iiitii., wing I'xp.'insion 7 mm. liody — RntliiT Inrgf, but roiisidcrnhly siiinllrr tliaii 

 tlu- n|>t<Toii.s forms, widr and flat, covered entirely witli long fine Iinirs wliieli are 

 situated on small tubercles. I'rcvailin'! color — Dark (treeiiisli brown. Ofler 

 slightly jiruinose giving it the gravisli color. Head — Nearly as long as wid«', 

 rounded in front, broad between the antenntr, black, with indistinct frontal tulx-r- 

 eles. A'v'* — I.;irge. with tubercles, dark red. .■in/c;ifi(i«'--( Figure '.i^H. I and 2). 

 On very indistinct frontal tubercles, reaching to the middle of the alxlomen (n 

 little longer than h.ilf the length of the body), hairy, articles I and II dark, nearly 

 as dark as the liead, tile remaining articles anilKT or light brown. Lengths of 

 the articles: I, 0.08 mm.; 11, 0.07 mm.; Ill, 0. V8 mm.; IV, 0.'.'()."> mm.; V, O.-'l 

 mm.; VI, 0..'tl mm. (base O.li;") mm., spur 0. !()."> mm.); total I.H.') mm. I and II 

 nearly coecpud with the former, the largest and usually the longest. III is by far 

 the longest article, being nearly twice as long as IV, more than twice as long as 

 V and much longer than \'I, IV is slightly longer than V. but shorter than \'I. 

 The spur .-ind the base of VI are nearly coecpial, though in the winged forms the 

 spur is slightly the longer, imbricated throughout. The scnsoria are all circular 

 .•ind vary greatly in size and distribution. On III they arc .scattered the entire 

 length, varying in numlxTs from twelve to twenty, the average being sixteen or 

 seventeen. On article I \' tin-re are from one to two, the first very near the base 

 and the second near the middle. Out of ten average articles, six had one scnsoria 

 and four had two. There is but one near the apex of V and five small ones and 

 a single Large one on \'I at the base of the spur. Uostrum — Reaches just beyond 

 the middle of the abdomen, whitish-yellow with a dark tip. Prolhoras — Without 

 lateral tubercles, hairy, wider at base than at the apex, black. Mrso- and Mela- 

 thorax — Black, with nni.scle lobes well di-veloped. hairy. Ahdnmrn — Flat, wide, 

 last two segments narrow and extended, brownish-green with large and small 

 transverse black markings, as shown in the drawing, dark spots along the lateral 

 magrins, light around the bases of the cornicles. Ventral surface greenish. Anal 

 plate extended, small, clouded green, hairy, rounded. Cornicles — (Figure 2.S+, 4). 

 .'^ho^t. widest at the base, constricted just before the mouth, which is flaring very 

 slightly, surface covered with fine network of lines forming a mosaic of long 

 figures at the base and five or six-sided mosaic figures throughout the apical two- 

 thirds, light yellowish green, length 0.08 mm., width of base 0.12 mm., width of 

 mouth 0.07 mm. Les;.t — Rather slender, hairy, hind legs considerably longer than 

 the first two pairs, coxiv dark, femora with basal halves yellow and apical halves 

 amber brown, tibia- amber brown with apical half yellowish, tarsi (F'igure 2."?1'. 8) 

 dusky yellow to dark amber brown; basal segment short and with prominent 

 projection on lower side from which ari.ses a s))ine. one-half as long as the .second 

 segment not including the claws. JVingn — Normal, hyaline with all veins very 

 faintly clouded. Primary — Length 3.2 mm., width 1.1 mm. Veins faintly cloud- 

 ed, dark brown, margin constricted at the tip of the stigma. Costal wide, brown. 



