Bulletin of the Illinois State Laboratory of Natural History, Volume 4, Issue 13The Laboratory, 1896 - Natural history |
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Adult female Adult male Anal opening Antennæ prominent apparently five-jointed Aspidiotus æsculi Aspidiotus comstocki attacks the trunk author's collection bark brownish Champaign club-shaped organs coccid color covered with excretion dirty whitish dorsal scale eggs are pale Eggs.-The eggs Entomologist following characters form shown groups of spinnerets hibernates Illinois State Laboratory Laboratory of Natural larvæ last joint Last segment laterad lateral margin Legs Length little darker lobes are long male.-The mature male male.-The scale mature female Plate Mature female.-The body mature male Plate Mature male.-The mature median pair National Museum Natural History notched pair of lobes pale yellow Plate XXIX Plate XXXII poiser posterior laterals presents the following pupa purplish scale insect scale of female scale of male Scale of male.-The second lobes snowy white Spines prominent sugar maple Tarsi third spine thoracic shield tibiæ twig Types in collections Ulmus americana United States National ventral scale XXXI XXXII yellowish
Popular passages
Page 380 - ... color. The first skin usually shows the segmentation distinctly, length about .4 mm.; the second skin is more or less covered with secretion, length about .65 mm. Ventral scale a mere film applied to bark of plant. Female. — The body of the mature female is rather flat, pale yellow, and oval in shape. The last segment is a little deeper yellow than the rest of the body, and presents the following characters: — There are five groups of spinnerets. The anterior group contains four to five;...
Page 379 - The mature males begin to appear about the middle of April and the first brood makes its appearance early in May. It is not an uncommon thing, however, to find young and eggs as late as June 20. The mature males of the second brood begin to appear about July 10 and continue to emerge until about the first of August. I am of the opinion that there are three broods in extreme southern Illinois. It is related to Putnam's Aspidiotus...
Page 388 - I, 1; they are similar except that the last one is forked ; one between first and second lobes, one between second and third lobes, two laterad of third lobes and three more beyond that. Spines are prominent, extending beyond plates. The first pair are situated near the lateral margin of the first lobes; the second about the lateral margin of the base of the outer lobules of the second lobes; the third pair on the lateral margin of the third lobes; another pair of spines outside of the third lobes....
Page 382 - ... the characters of the last abdominal segment, made from specimens collected at San Jose, Cal., will be found on opposite page. Aspidiotus sesculi Johns. Scale of Female. — Circular, rather convex; diameter 1.5 to 3 mm.; color, dirty gray, conforming to color of bark; exuviae a little to one side of center, and covered with excretion. In rubbed specimens the protuberance indicating the position of the exuviae is orange-red and surrounded by a band a little darker in color than the rest of the...
Page 377 - ... segmentation distinctly, length about .4 mm.; the second skin is more or less covered with secretion, length about .65 mm. Ventral scale a mere film applied to bark of plant. Female. — The body of the mature female is rather flat, pale yellow, and oval in shape. The last segment is a little deeper yellow than the rest of the body, and presents the following characters: — There are five groups of spinnerets. The anterior group contains four to five; the anterior lateral, seven to eight; the...
Page 382 - Scale of male — The mature male scale is oblong oval, nearly twice as long as wide, and averaging in length about half the diameter of the female scale. The position of the larval scale is marked by a nipple-like prominence located between the center and the anterior margin of the scale. The scale of the male is usually darker than of the female, sometimes black, but often gray. the larval scale covering the exuviae very frequently light yellow as with the female. Not uncommonly the circular scale,...
Page 384 - Aspidiotus a'sculi, on buckeye (JEsculus calif arnica), at Stanford University, Cal., three years ago. It attacks the trunk, branches, and smaller twigs, but so far as I have observed does not occur on the foliage. The color of the scale usually conforms to that of the bark, and when not abundant the insect is difficult to detect. In February, 1895, the markets of central Illinois were stocked with California oranges of a very inferior grade. The local dealers at Champaign sold...
Page 383 - ... darker yellow. Four groups of spinnerets, number in each group extremely variable; anterior laterals, 5-17, average 10; posterior laterals, 4-11, average 7; number variable on opposite sides of same individual; one pair of lobes, nearly as broad as long, notched on lateral margin near the tip. Plates simple and inconspicuous, one usually just laterad of the lobe and two between the second and third spines. Spines promr iof mt CTP.>lel.
Page 381 - ... the last joint, small, moniliform, joints three to five increasing in size but smaller than pedicel, joints six to the penultimate a little wider than long; abdomen not, or only slightly, longer than the head and thorax united, the genitalia long, exserted, curving downwards." "Habitat. — Havana, Illinois." "Types in collections of the Illinois State Laboratory of Natural History and in my (Ashmead's) collection.
Page 383 - ... center and the anterior margin; this is usually covered with a slight excretion, but when rubbed it is orange-red. Ventral scale white, slightly thicker than that of female. Mature Male. — Yellowish; eyes and antennae prominent; body stout; legs long, lighter yellow than rest of body; wings large; thoracic shield with band distinct and with margins indistinct in some specimens. Length, .60 mm.; style, .39 mm. Mature Female. — Ovate, rather plump; yellow, last segment a little darker yellow....