395 
history, with description of the species, will be found in a pamphlet 
entitled Die schadlichsten Insekten des Tabak in Bessarabien (Moscow, 
1888. pp. 51-76). 
The fact of the occurrence of this species in Europe indicates, in my 
opinion, that it is not a native of this country, but that it has been 
imported from Europe, either with tops of green onions or on leaves of 
cabbage, infested parts of which were either brought ashore or thrown 
overboard, while the ships having such vegetables on board lay in our 
Eastern harbors. From such points of infection, after having secured 
a foothold, they gradually spread in all directions, following closely the 
trunk lines of the railroads, until they reached the Pacific Slope. 
The species may be redescribed as follows : 
Thrips tabaci Lindeman. 
Female. — Length of body, 1 to 1.2 mm . Color, pale yellow, the thorax somewhat 
darker; sides of thorax and an elongated squarish spot on the meso-notum more or 
less distinctly dusky. Abdominal segments marked with a rather broad, darker, or 
lighter dusky band posteriorly. Eyes brown. Ocelli colorless, their inner margin 
more or less distinctly orange. Antenna? and legs x>ale dusky, with tip of tarsi some- 
what darker. Wings faintly yellowish, their fringes and bristles dusky. 
Antenna; 7-jointed. Joint 1 shortest and stoutest; the second slightly longer. 
Joints 3 to 5 are elongate-ovoid and subequal in length ; the sixth is elongate-conical 
and longer than the others; the stylus is one-jointed. All are provided with a few 
stout bristles and the third and fourth in addition with two stout, blunt, curved, 
sensorial spines near the apex. Head about as broad as long, and transversely stri- 
ated. Eyes hairy. 
Prothorax longer than broad, slightly narrowed in front; its anterior and pos- 
terior angles rounded, and provided with two backward-directed diverging spines at 
each posterior angle; surface transversely striated. Spines and bristles of the 
abdomen similar to those of Thrips tritici. Legs rather long and slender, partic- 
ularly the last pair. Wings densely covered with minute spines, and witb stout 
spines or bristles along the veins and anterior margin, while the hairs of the fringes 
are slender and wavy. 
Male. — This sex resembles the female in every respect, except that it is much smaller, 
narrower, and with the end of the body bluntly rounded. Its length is about 0.7 IDm . 
Larva: The mature larva is somewhat smaller than the female, and of a paler or 
darker yellow color, often with a greenish tint. Eyes reddish. Ocelli wanting. 
Legs pale dusky. Antennae 6-jointed, short and stout. Joint 1 broader than long; 
the second about twice as long, stoutest and rounded at the apex. The third is 
longer than the second, pyriform and with a short but distinct pedicel, orna- 
mented with, apparently six, rather shallow annulations; the fourth joint is almost 
as long as 2 and 3 combined, fusiform, and divided by about eight annulations; the 
fifth is very short, but indistinctly separated from the fourth, and much shorter 
than the last. All bear a few slender hairs. The thoracic and abdominal segments 
are ornamented with from six to eight transverse rows of closely set. minute, lit shy 
tubercles, while each of the abdominal segments in addition is provided with a lat- 
eral bristle, which gradually become longer and more slender toward the end of the 
body. 
This species resembles in general appearance Thrips striata Osb., 
T. tritici Fitch, and T. occidentalis n. sp., but differs from all of them in 
the stylus of the antenna?, which is only 1 -jointed. It belongs evi- 
dently to Walker's " Section 4, Xeogami.'' and may form a new sub- 
genus of Thrips. 
