363 
ally with brown; middle and hind tibie blackish brown, extremities 
paler; all tarsi clear yellow. 
Abdomen lanceolate, widest at segment 4; spines short) inconspic- 
uous. 
Measurements:—Total length 1.24 mm.; head, length .10 mm., 
width .18mm.; prothorax, length .16mm., width .24mm.; pterothorax, 
width .32 mm.; abdomen, width .34 mm. Antenne: 1, 28m; 2, 42 mu; 
Sessa Oso, St 0. 84 UT, 25 u8,.22 uO 25 total. 37 mim. 
Male.—Length .72-—.80 mm.; prothorax, length .14 mm., width .22 
mm.; mesothorax, width .22 mm.; abdomen, width .19 mm. 
Brachypterous. Last ventral segment of abdomen with a broad, 
semicircular emargination, each side of which is an acute tooth. 
Described from twelve females and two males, taken at Urbana, 
Illinois, in flowers of Jack-in-the-pulpit (Arisema triphyllum), by Mr. 
Frank C. Gates. 
Genus SERICOTHRIPS Haliday, 1836. 
Sericothrips pulchellus sp. nov. 
Female.—Length about 1 mm. Color dark blackish brown to black, 
with bright red hypodermal pigmentation. 
Similar to S. vartabilis (Beach), differing from it as follows: 
Head uniform gray-black. Antennal segments 1 and 2 dark blackish 
brown, the latter grayish yellow at middle; segments 3, 4, and 5 grayish 
yellow, 5 slightly clouded apically; segments 6-8 gray, the basal third 
of 6 grayish yellow. 
Prothorax concolorous with head, with conspicuous black reticula- 
tion, and thickly dotted with black spots, the latter visible only under 
high power. Pterothorax nearly concolorous with prothorax, the red 
pigmentation usually quite conspicuous. Fore wings black, tipped with 
white, and with two broad white cross bands, one near base, other near 
apex. Femora nearly concolorous with body, pale basally; ground 
color of tibiz pale yellow, the fore pair clouded basally and laterally with 
brown; middle and hind pairs pale at extreme base, beyond which they 
are concolorous with the femora to, or slightly beyond, middle; tarsi pale 
yellow. 
Abdomen often pale at middle, and with segments 7—10 darker. 
Measurements:—Total length 1.0 mm.; head, width .17 mm.; pro- 
thorax, length .14 mm., width .21 mm.; mesothorax, width .28 mm.; 
abdomen, width .31 mm. Antenne: 1,22 4; 2, 39 »; 3, 62 w; 4, 59 p; 
Beto G03. (6 7, 11 4; 8, t4-0~total, .31 mm. 
Male.—Length about .7 mm. Coloration similar to that of female. 
This species is very close to S. variabilis (Beach), but the colora- 
tion is distinctive. In living specimens, examined under a hand lens, 
