202 NEW YORK STATE MUSF.UM 



male scales were clustered largely on leaf stalks and alon^,'- leaf veins. Sep. 

 15 the leaves were deserted by the insects and the males had probably all 

 emerj^^etl. Badly infested twi^s have a sour, semiputrid odor due in all 

 prol)ability to the decomjjosition of the larj^a' amount of honeydew excreted, 

 since stones beneath badly infested trees were kept moist with this sub- 

 stance even on hot, midsummer days. 



Description. llu- ailult female, plate 12, figure 3, 11, is from 'h to 

 ai)()Ut I 6 inch in length by less than one half that in diameter. She is 

 slightly broadest posteriorly, hemispheric, highly polished, and when not 

 rubbed, is covered with a very delicate, transparent, glossy or wa.xy secretion. 

 There arc apparently 12 or more distinct radiating ridges on each side, 

 which are most noticeable around the margin of the body but start at 

 som<! distance from the ilisk of the scale, those of the thoracic segments 

 being more highly developed. The disk or ' medial dorsal stripe is 

 smooth or faintly rugose. The general color is a light or dark red with 

 a broader or narrower, blackish, subdorsal liand surrounding the disk 

 and composed of confluent spots. There is also a marginal row of elon- 

 gated, rectangular spots of the same dark color between the ridges. 

 These markings frequently extend to the sulxlorsal band and give the scale 

 insect a very pretty appearance. The scales are frequently entirely black, 

 with the excejjtion of the median stripe, which is red, or they may be 

 entirely red with but faint traces of darker markings. The adult males are 

 brick-red, rather stout insects with nearly transparent wings and an elon- 

 gated, rather thick style at the tip of the abdomen, plate 12, figure 10. 

 They are about ' 25 inch in length. The recently hatched \oung, jjlate 12, 

 figure 4, are yellowish, about '/50 inch in length and with two peculiar, 

 knobby protuberances near the anterior third. The dorsum is fiat in many 

 individuals antl in others it is decidedly grooved. The posterior extremity 

 bears two slender, curved setae. 



Parasites. This species is undoubtedly kept in check to a considerable 

 extent 1)\- natural enemies. Probal^lv the most efficient are certain minute 

 parasitic Hymenoptera. We succeeded in rearing four species, kindly 



