. A year of Costa Rican natural history. ter half bears six or sevenmostly elongated yellow spots and some small whitish dotsnear the wing margin. On the hind wings the black formsa border containing thirteen small rounded whitish spots;there are two other blackish-brown stripes united at theirouter ends not reaching to the black border. The head isblack with some small white spots, the thorax and abdomenare striped with black and dull yellowish. The antennaeare 18 millimeters long, blackish, but the last 7 millimetersyellowish. When the brushes were thrust out each appeared througha vertical
. A year of Costa Rican natural history. ter half bears six or sevenmostly elongated yellow spots and some small whitish dotsnear the wing margin. On the hind wings the black formsa border containing thirteen small rounded whitish spots;there are two other blackish-brown stripes united at theirouter ends not reaching to the black border. The head isblack with some small white spots, the thorax and abdomenare striped with black and dull yellowish. The antennaeare 18 millimeters long, blackish, but the last 7 millimetersyellowish. When the brushes were thrust out each appeared througha vertical slit. Each brush consisted of a stalk and the bundleof hairs. When at rest within the abdomen the hairs lieinside the whitish stalk through whose translucent wallsthey can be indistinctly seen. By the lengthening and turn-ing inside out of the stalk the hairs were gradually broughtinto view but were all closely pressed against each otherforming a straight, parallel-sided brush, but when the stalk 78 A YEAR OF COSTA RICAN NATURAL HISTORY. had completely lengthened and brought even the bases ofthe hairs into view the hairs were directed every way and thebrush became spherical. The brushes of right and left side were thrust out together, in our ex-perience, and when fully expandedgave an extreme width of about 24millimeters or I inch to the appar-atus at the tail end, which of coursewas in striking contrast to the sameend when the brushes were with-drawn. Each stalk was about thesame length as the last abdominal^^ segment and on its inner side wasa flesh-colored elongated tubercleabout half as long as the of butterfly, Lye- Each brush was composed of somearea atergatis, male, showing hundreds of hairs, each hair was brushes fully extended. Drawn ^^^^^ 5 millimeters long. Underfrom life. Enlarged times. , , . 11. the compound microscope the hairsare pale yellow for a short distance at their bases andentire in outline, but for most of its length the hair isblack, o
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
