SANBORN-. KANSAS APHIDID.E. 51 



extending a Uttle beyond the thorax. Sensoria circular, nearly 

 uniform in size ; from eight to ten on the third joint, situated 

 nearly in a straight row, about four in a row on the fourth, 

 the usual one near the distal end of the fifth, and a cluster of 

 seven not uniform in size on the distal end of the sixth. Eyes 

 black ; ocular tubercles not prominent ; ocelli normal. Beak 

 dark, extending to the mesocox?e, being 0.54 mm. long. 



Prothorax dark, cephalic margin black, lateral tubercles 

 broader than long. Thorax black, membrane pale brown. 

 Wings nearly hyaline, veins black, bordered with a very light- 

 smoky tinge, which is about twice as broad as the veins. 

 Stigma light brown, 0.12 mm. broad and 0.68 mm. long. Total 

 wing expansion, 6.80 mm. Legs hirsute, articulations dark, ex- 

 cept the coxal ones, which are pale yellow. 



Abdomen brownish green, with about four black spots along 

 the lateral margins, also the distal segment ventrad the style is 

 black. One lateral tubercle on each side the first abdominal 

 segment, and one on each side the abdominal segment caudad: 

 the honey-tubes. Honey-tubes cylindrical, black, imbricated, 

 and 0.18 mm. long. Style black and hirsute, equal to the 

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

 1.80 mm. 



This form was taken April 21, on the wild gooseberry {Ribes 

 sp. ?) . It is gregarious, colonizing the petioles and tender grow- 

 ing stems of the plant. The young apterous forms are green, 

 thus being protected by coloration with the host-plant ; yet they 

 are not entirely exempt from parasitic enemies on this account, 

 for whole colonies are often exterminated by them in a few 

 days after being attacked. 



Aphis nerii Fonsc. Plate VIII, fig. 48. 



Head black. Antennse yellowish black, bare, and imbricated 

 length of segments : I, 0.07 mm.; II, 0.05 mm.; Ill, 0.28 mm. 

 IV, 0.19 mm. ; V, 0.19 mm. ; VI, 0.10 mm. ; VII, 0.27 mm. 

 total length, 1,05 mm., extending to the abdomen. Sensoria 

 circular, large and unequal in size ; about nine on the third 

 joint, none on the fourth, the usual distal one on the fifth, six 

 small and one large one at the distal end of the sixth. Eyes 

 black; ocular tubercles reddish; ocelli normal. Beak dark, 

 0.39 mm. long, extending to the mesocoxie. 



