348 THE CANADIAN ENTOMOLOGIST. 



was of a light greenish-white colour, somewhat pink-tinged. It was slug- 

 shaped, attenuated, the dorsum convex, the ventral surface flattened, the 

 legs retractile. Pupation took place freely among the leaves. 



Pupa. — Colour dark brown, somewhat lighter on the ventral surface. 

 On abdomen several indistinct longitudinal series of black spots. Posterior 

 and anterior ends well rounded ; ventral outline straight ; dorsal outline, 

 except for a depression on the mesonotum, very evenly rounded. Length, 

 7 mm.; greatest breadth, 4 mm. One larva pupated June ist, and the 

 perfect insect emerged June 23rd. 



A SECONDARY SEXUAL CHARACTER OF APHIDID^, 11.— 



Supplementary. 



by john j. davis, office of the state entomologist, urbana, ill. 



Since the publication of "A Secondary Sexual Character of Aphididre," 

 in Can. Ent., August, 1908, Dr. John B. Smith has called my attention 

 to two important papers on the tibial sensoria, which I overlooked in 

 the review of previous literature on the subject. 



Li Science for January 20, 1893 (Vol. XXI, p. 31), Dr. Smith speaks 

 of having found these "sensory pitting^" on the hind tibise of several 

 species of the oviparous female aphides, and that "these structures differed 

 in each of the species examined in size, arrangement and number." He 

 quotes a letter from Dr. C. V. Riley, to whom he had written for data as 

 to the occurrence of these sensoria in other species, which states that he 

 had found these "pits" present in Aphis 7fiaii, A. pruni, Myzus 7nahaleb^ 

 Siphonophora rosce, Sipho7iophora sp.., on rose ; Call ipt ems sp. ? on oak ; 

 in Fhyl/ap/iisfagi, and in Alelanoxaiitliiis salicti\ but had not found them 

 present in Schizo7ieura, G/yphhia, Pe77iphigtis or Phylloxera. \)x. Smith 

 further mentions and figures these tibial sensoria, in Bulletin 143 of the 

 New Jersey Agricultural Experiment Station, pp. 19-20, 1900, as 

 occurring on the hind tibiae of the oviparous females of Aphis 77iali. 



Mr. R. A. Vickery, in "A Comparative Study of the External Anatomy 

 of Plant Lice" (separate from the 12th Report of the State Entomologist 

 of Minnesota, May, 1908), says, in his discussion of the legs of the 

 Aphididce, \). 11, "In the oviparous female of Nectarosiphu77i rubicola, 

 Rhopalosiphu77i hippophaii, Callipterus trifolii., Toxoptef^a g7'ami7iti77i^ 

 Mac7'osiphu77i pisi and others the tibia of the hind leg is swollen for its 

 whole length, and is thickly dotted with clear pits, which closely resemble 

 the sensoria of the antennae. The tibia in this case has some function in 

 connection with oviposition." 



October, igo8 



