Pomona College Journal of Entomolooy 731 



Symdobius salicicorticis n. sp. 

 (Tlic Willow B.irk LousL-) 



WINGKI) VIVIPAROUS FEMALE ( FigUrC ZS'i A) 



Length -^.l' mm., widtli of inesothorax 0.7 mm., width of tlie .•ibdomcn, l.l.'i 

 mm., wing cxp.iiision 7 mm. lioth/ — Rather hxrgc, but considerably smaller than 

 the apterous forms, wide and tint, covered entirely witii long fine Iinirs which are 

 situated on small tubercles. Prevailing color — Dark greenish brown. Ofter 

 slightly pruinose giving it the grayish color. Head — Nearly as long as wide, 

 rounded in front, broad between the antennae, black, witli indistinct frontal tuber- 

 cles. Eyes — Large, with tubercles, dark red. Antennae — (Figure 2,S t, I and 2). 

 On very indistinct frontal tubercles, reaching to the middle of the abdomen (a 

 little longer than half the lengtli of the body), hairy, articles I and II dark, nearly 

 as dark as the head, the remaining articles amber or light brown. Lengths of 

 the articles: I, 0.08 mm.; II, 0.07 mm.; Ill, 0.48 mm.; IV, 0.265 mm.; V, 0.21 

 nun.; VI, 0.31 mm. (base O.li.5 mm., spur 0.165 mm.) ; total 1.415 mm. I and II 

 nearly coequal 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 VI, IV is slightly longer than V, but shorter than VI. 

 The spur and the base of VI are nearly coequal, though in the winged forms the 

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

 and vary greatly in size and distribution. On III they are scattered the entire 

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

 seventeen. On article IV there 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 sensoria 

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

 a single large one on VI at the base of the spur. Rostrum — Reaches just beyond 

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

 lateral tubercles, hairy, wider at base than at the apex, black. Meso- and Meta- 

 thorax — Black, with muscle lobes well developed, hairy. Abdomen — 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 234, 4). 

 Short, 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 througliout the apical two- 

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

 mouth 0.07 mm. Legs — Rather slender, hairy, hind legs considerably longer than 

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

 amber brown, tibifp amber brown with apical half yellowish, tarsi (Figure 234, 8) 

 dusky yellow to dark amber brown ; basal segment short and with ])rominent 

 projection on lower side from which arises a spine, one-half as long as the second 

 segment not including the claws. Wings — Normal, hyaline witli all veins very 

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

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



