734 Pomona College Journal of Entomology 



from tlie front to tlic middle of tlio .•ibiiomcn with faint cross-lines connecting 

 darker transverse areas on both sides (usually a single area on the side of each 

 segment) which do not usually extend to the lateral margins of the body, the 

 posterior half of the abdomen is decidedly darker than tlie rest of the body with 

 light areas surrounding the cornicles and a light pygidium. In not a few indi- 

 viduals this dark area extends forward, covering nearly all of the abdomen, but 

 in such cases the light longitudinal median line is always distinct to the middle 

 of the abdomen. The last two or three segments are extended and much narrower 

 than the rest of the body. This extension is usually light, with dusky, small, 

 anal jilate at the tip. Cornicles — (Figure 234, 5). Of the same shape as those 

 of the winged females, but larger, marked with mosaic lines, transparently white 

 or yellow. Length 0.1 mm., width of base 0.1 <t mm., width of mouth 0.08 mm. 

 Legs — Rather short and slender, first and second pairs very short, hairy, coxae 

 dark amber brown, femora dark amber brown, tibiae yellow with dark brown tips, 

 tarsi brown. Style — (Figure 234, Q). Bluntly conical, smooth, short, width of base 

 greater than the length, light yellow, with dusky margins, with very few hairs. 



The adult insects move very rapidly and are active for a semi-underground 

 form. 



Young — The young vary from almost transparently white to yellow and dark 

 amber, with or without dorsal markings. 



Host — Found associated with Ftillairai/a saliciradicis at the surface of the 

 ground, but mostly under ground feeding upon the bark of the Willow (Salix 

 laevigata Bebb.). It collects in large colonies, some of which were found four 

 inches under the surface of the sandy soil. The individuals collected underground 

 are not so dark nor so distinctly marked as those taken near the surface. Both 

 winged and apterous females were abundant and were being preyed upon by the 

 larvae of a red syrphid fly, which has not been determined. 



Locality — Collected from the willow trees growing in the sand along the 

 banks of the Santa Clara River in the vicinity of Santa Paula, Cal. 



Date of Collection — August 16, ipil. Serial number 11. 



This species somewhat resembles Melanaxantherium rufulus (Davidson) in 

 size and general color, but differs in habits and in generic characters as both 

 descriptions show. Fearing that it might be Melano.vantheriiim saliceii (Harris), 

 specimens were sent to Mr. Davidson at San Jose, who has collected that species 

 at Stanford University. His reply was that No. 1 1 compared favorably with 

 William's ChaitopJiorus bruneri. Comparing it with this species we note the 

 following differences: 



Chaitophorus bruneri Williams Symdobius salicicorticis n. sp. 



Color 

 Green, light or very dark. From a light yellow to amber brown, 



sometimes with greenish brown cast. 

 Cornicles 

 In ajoterous form longer than broad. In apterous form, the base is broader 



tlian the length. 

 In winged form, as long again as In winged form, the width of the 



broad. base is much greater than the length. 



