98 MISCELLANEOUS STUDIES 



always with second branch very short, abdomen glabrous, rather bright though not 

 vivid green, median line dark green, sutural lines dark green ending in marginal 

 green dots, cornicles dark, cauda green. 



Aphis cerasifoliae is gregarious on the ventral surface of the terminal leaves 

 badly curling and deforming them. A copious amount of honeydew is present, 

 and ants are usually found attending a colony of this species. 



The specimens from Wynola agree very well with this description, 

 although as stated above, there are a few minor points of difference. 

 However, as Dr. Patch writes: "It seems too close to cerasifoliae to 

 give it a distinct name," and "if the appearance in life answers my 

 description of cerasifoliae I should be inclined to call it that. It hap- 

 pens to be a species as characteristic alive as dead." Following are 

 the notes the author took of its appearance alive, before he suspected 

 its identity: "Alates, apterae and nymphs abundant on terminal 

 leaves curling them badly. Large amount of honeydew and many 

 ants in attendance. Apterae and nymphs pulverulent." These notes 

 agree exactly with Patch 's notes, cited above. 



Following is a brief description of specimens taken at Wynola on 

 July 8 : 



Apterous viviparous female. Prevailing color pale apple green, 

 pulverulent. Head luteous. Thorax and abdomen pale green with 

 middorsal longitudinal stripe darker green. Antennae with the three 

 basal joints luteous, the three apical joints shading into black. Pri- 

 mary sensoria on V and VI, accessory sensoria on VI, no secondary 

 sensoria. Ill and spur are subequal, or III slightly the longer. IV 

 and V subequal and a little more than one-half as long as III. In 

 some cases IV is slightly longer than V. VI is about one-fourth as 

 long as its spur, longer than I, which in turn is longer than II. The 

 antennae are longer than the body. Cornicles long, slightly tapering, 

 pale with tip dusky, about equal in length to the fifth antennal seg- 

 ment and about twice the length of the hind tarsus. Cauda long, 

 conical, and about two-thirds the length of the cornicles, pale with tip 

 dusky. Lateral tubercles are present on the first and seventh abdom- 

 inal segments and on one other of the abdominal segments, in some 

 cases on the second, in others! on the third, and in others on the fourth. 



Measurements (of specimens mounted in Canadian balsam) : Body 

 length, 1.5 to 1.53 mm.; body width (abdomen), 0.247 mm.; antennae 

 total, 1.445 to 1.734 mm. (av. 1.6082 mm.) ; I, 0.085 to 0.117 mm. 

 (av. 0.0987 mm.) ; II, 0.068 mm.; Ill, 0.408 to 0.467 mm. (av. 0.4335 

 mm.) ; IV, 0.238 to 0.306 mm. (av. 0.272 mm.) ; V, 0.221 to 0.233 mm. 

 (av. 0.224 mm.) ; VI, 0.1105 to 0.119 mm. (av. 0.1169 mm.) ; spur, 



