86 Thomas Albert Williams 



112. Siphonophora rudbeckiae (Fitch). 



Fitch, St. Cab. Nat. Hist., p. 66 (1851). Aphis rudbeckiae. 



Thomas, Bull. 111. St. Lab. Nat. Hist., No. 2, p. 4 (1878). Siphonophora 

 rudbeckiae. 



Thomas, Ins. 111., 8th Rep., p. 49 (1879). Siphonophora rudbeckiae. 



Oestlund, Syn. Aph. Minn., p. 85 (1887). Siphonophora rudbeckiae. 

 Apterous viviparous female: Very large. Bright red. Antennae about 

 as long as the body, black, with paler base. Legs black, except the base 

 of femora and upper half of tibiae; very long. Honey tubes very long, 

 black. Tail over half the honey tubes in length, yellowish, the dorsum 

 without the tubercles found on S. ambrosiae Thomas. Length 4-4.20 mm. 

 Winged viviparous female: General color red. Head and thorax a 

 little darker. Antennae on large frontal tubercles, much longer than the 

 body, black, paler at base; VII longer than III. Eyes black. Beak long, 

 about as long as the honey tubes. Legs all black but the immediate base 

 of femora. Honey tubes very long, 0.80-0.95 mm., cylindrical, shining 

 black. Tail more than half the honey tubes in length, yellowish, upcurved 

 and rather acute. Size somewhat smaller than the apterous female. 



Very common throughout the season on Silphium sp., Am- 

 brosia sp., and many other Compositae. There are several differ- 

 ent color varieties. The one on Silphium and Rudbeckia, a bright 

 red form, is considered to be typical. All of the red and brown 

 forms on the composites are very closely allied. 



Specimens in the collection of the University of Nebraska (no. 

 153) and of the U. S. National Museum (nos. 366, 377, 391). 



113. Siphonophora solidaginis (Fabricius). 



Fabricius, Ent. Syst., IV, p. 211 (1794). Aphis solidaginis. 



Kaltenbach, Mon. Pflan., p. t> 2 (1843). Aphis solidaginis. 



Koch, Die Pflan., p. 197, figs. 269, 270 (1854). Siphonophora soli- 

 daginis. 



Buckton, Mon. Brit. Aph., I, p. 156, pi. XXV (1876). Siphonophora 

 solidaginis. 

 Apterous viviparous female: General color bright red. Elongate ovate. 

 Dorsum with regularly arranged rows of very small black tubercles, out 

 of each of which proceeds a black hair. Front hairy. Antennae black, 

 with pale base, pilose, on large frontal tubercles ; III longest. Head 

 brownish in many individuals. Eyes dark red. Beak reaching nearly or 

 quite to hind coxae, dusky to black. Legs long; tibiae, tarsi and distal 

 end of femora black, pilose. Abdomen arched, but segments generally 

 well defined. Honey tubes rather long, tapering, then widening at tips, 

 shining black, 0.60-0.80 mm. Tail about two thirds the honey tubes in 



170 



