66 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Rhopalosiphum dianthi Schrank. Plate IX, fig. 55. 



Head black. Antennse black, with a few hairs ; length of 

 segments: I, 0.09 mm. ; II, 0.07 mm.; Ill, 0.45 mm.; IV, 0.37 

 mm.; V, 0.30 mm.; VI, 0.12 mm.; VII, 0.41 mm.; total length 

 of antennae, about 1.81 mm., or about the length of the fifth 

 segment longer than the body. Sensoria circular ; ten to twelve 

 on the third joint, none on the fourth, the usual distal one on the 

 fifth, and about seven of unequal size at the distal end of the 

 sixth. Eyes red ; ocular tubercles prominent and red ; ocelli 

 prominent. Beak black, 0.36 mm. long, extending to the 

 mesocoxir. 



Prothorax black ; thorax black. Wings hyaline, veins frail 

 and dark brown in color. Stigma and costal veins light brown. 

 Stigma, 0.10 mm. broad and 0.77 mm. long. Total wing expan- 

 sion, 6.52 mm. Distal half of femora black ; distal end of the 

 tibia and the tarsi black ; all slightly hirsute. Legs all long in 

 proportion to the body. 



Abdomen pale green, with black markings on the dorsal sur- 

 face. In old specimens these black splotches frequently become 

 confiuent, forming an irregular dark area, as shown in the illus- 

 tration. Honey-tubes black in old specimens, but slightly pale 

 at the base in younger ones. They are incrassate, being en- 

 larged on the distal half more than is shown in the illustration. 

 Length, 0.36 mm., or about one and a half times the length of 

 the tarsum. Style black, hirsute, and spinous, somewhat curved 

 in the center, so that the distal end is turned dorsad. Length, 

 0.18 mm., or half the length of the honey-tubes. Total length 

 of the body, 1.80 mm. 



This form was taken April 25, on the pansy {Viola tricolor/) 

 It seems to be a greenhouse form, since the plants affected were 

 transplanted from hotbeds to open air, which served as hosts 

 for the innumerable form which colonized all parts of them, 

 beginning on the ventral side of the leaves. 



Genus Macrosiphum Passerini ^i 



Front grooved. Antenmr filiform, nearly always longer than 

 the body, and on distinct and approximate frontal tubercles. 



21. This Bonus has had a profuse confusion of names. Following are some of Tlieo. Per- 

 Kande's conclusions on the subject, which seem to be final : " In accordance with f)riorit.v, the 

 Keneric term Siphonopharu, as adopted by Koch, had already been preoccupied by Eschscholtz 

 and described by him in ',Syst. d. Acaleph,' in 1S29, though, without knowing this fact, it was 

 again applied by Brandt (Bull. Acad. St. Petersburg) in 1836, for a genus belonging to the Myri 

 opoda. Oestlund, recognizing the preoccupation of ,S'//(/(0))oy(/(o>v(, .substituted for it (Aphididfp- 

 of Minnesota, p. 78, 1887 J the name JS'cclaroiiliora, overlooking the fact that Ncclurophoru wa 



