59 



side of the venter. These females, as soon as they settle on the peach 

 or x)luni, give birth to true or sexual wingless females. 



Male. — By the time the earliest sexual females are full grown, which 

 requires between three and four weeks, the return migrants become 

 again more numerous and prove to be generally true males. This 

 migration continues, if the weather is not absolutely unfavorable, till 

 the end of the season, toward the end of November or the commence- 

 ment of December. 



Description of male. — Length, 2 mm.; expanse of wings, 6.8 mm.; general appear- 

 ance very similar to that of the migratory female. It is, however, smaller in size, 

 with the sides of the abdomen quite parallel and with comparatively longer wings 



and antenna', which latter reach quite a distance beyond the tip of the abdomen. 

 General color somewhat darker, often inclining to orange, especially on the thorax 

 and legs. The squarish, dusky spoton the abdomen is narrower than in the migrat- 

 ing female, and reaches often nearly to the end of the abdomen ; it is frequently 

 divided into three separate bands, and is usually connected anteriorly with the 

 median one of the three lateral spots; anterior to this are the two usual narrow 

 transverse bands and often additional minute spots. Genital claspers and a sub- 

 ventral row each side of five to six small spots, black. 



Sexual female. — Length of the mature female, 2.4 to 2.6 mm. ; body stout, broadest 

 at the middle, tapering almost equally toward both ends; frontal tubercles dusky, 

 short, stout, their inner angles bluntly gibbous; antenna' blackish, darkest toward 

 the end, the third joint more or less pale at base, slender, scarcely reaching to base of 

 nectaries; seven-jointed; third and seventh subequal in length, fourth somewhat 

 shorter; posterior tibiae distinctly stouter than the others; nectaries identical with 

 those of the male and migratory female ; tail shorter and stouter than in the previous 

 stages and scarcely half the length of the nectaries; color quite variable, the palest 

 being red, while a great many are of different shades of brown, greenish-brown, or 

 dark grayish-green, often almost black ; all, however, are marked with a more or less 

 distinct, dusky, medio-dorsal spot; the color of the legs also varies from pale dusky 

 to nearly black; tarsi black; nectaries dusky, black at tip; tail and tip of abdomen 

 blackish. 



Winter e<jg. — Length, 0.7 mm.; diameter, 0.3 mm.; regularly oval in shape, highly 

 polished, light green, and more or less transparent at first, changing gradually to a 

 jet black. 



