730 Pomona College Joirnal of Entomology 



lateral tubircle on each margin. Abdomen — Witli six rather Heshy lateral tuber- 

 cles on each margin, large dejiressions between the segments near the lateral 

 margins, color dark, nearly black, with dorsal median line and slight area between 

 segments dark reddish brown, and with a reddish band across the base of the last 

 segment. Cornicles — (Figure 233, 3). Same shape as those in winged form, 

 basal half color of the body, apical half yellow, length 0.115 mm., width of base 

 0.115 mm., width of mouth 0.08 mm. Legs — Front pair very short, and middle 

 pair shorter than the hind pair, hairy, colored as in winged form. Anal plate — 

 Rounded, dusky. Style — Short, broad at base, about three times as wide as the 

 length, broadly conical, hairy, yellow, pinkish or amber, slightly dusky. 



Youns; — Young of the apterous females are amber, reddish or dark brown 

 with a lighter longitudinal band on the median dorsum occupying most of the 

 head, one-third the width of the thorax and considerable of tlie abdomen, where it 

 is the widest. 



Host — Feeding only on the younger stems of the white willow, {Salix 

 macrostachija Nutt.), and associated on the same twigs with the small green aphid, 

 Thomasia cruris. It is not a leaf feeder at all, lives in dense colonies, and pro- 

 duces large quantities of honey dew, so that the infested trees are very black 

 with smut. Usually found near the tips of the twigs and does not seem to feed 

 upon the old bark at all. The apterous forms are very plentiful while winged 

 individuals are scarce. 



Locality — On low willow trees growing along the banks of the Santa Clara 

 River in the vicinity of Santa Paula, Cal. 



Date of Collection — August 25, 1911. Serial number 50. 



This sj)ecies resembles most Chaiiophorus nigrac Oestl. (now a synonym of 

 Chaitophonis vitt^inalis Moiull) in slia|)e and general color, but differs from that 

 insect as described by Prof. Oestlund in the following: 



Chaitophorus nigrae Oe-sll. Symdobius macrostachyae n. sp. 



Antennae 



Article IV a little shorter than V. Article IV usually a little longer 



than V or subequal. 



Base of VI about half as long as V. Base of VI nearly as long as V. 



VII (spur of VI) as long as IV. The spur of VI nearly as little over 



half as long as IV. 



Rostrum 



Rostrum rather short, reaching sec- Rostrum long, nearly as long, as long 



ond coxa". or longer tli.m to the tij) of the abdo- 



men. 



Style 



Style tubercle-like, or even knobbed Style bro.idly conical .ind not knob- 



as in Callipterus. bed as in Calliptcrus. 



