392 
Some short and stiff hairs, becoming more numerous toward the end of the body ; 
may also he observed near the posterior lateral angle of the abdominal segment; 
one or two larger ones on segments 5 to 8 and a number of long bristles along the 
posterior margin of the ninth. 
EUTHRIPS OCCIDENTALIS SP. NOV. 
Specimens of this species were transmitted to the Department of 
Agriculture during June of 1881 by Mr. Alexander Craw, from Los 
Angeles, Cal., with the information that great numbers were infesting 
the underside of the young and tender leaves of one-year-old apricot 
trees, and that the constant irritation causes the leaves to become 
deformed. He stated that he had known these insects for years, but 
had not previously considered them particularly injurious. 
During February, 1891, the same species was received from Mr. 
D. W. Coquillett, who observed them to be plentiful in the blossoms of 
orange trees. In July of the same year Mr. Coquillett informed the 
Department that this insect was damaging the leaves of potatoes in 
that locality, and that he had noticed it also on different kinds of weeds. 
Up to the present time this species has been considered as being 
probably identical, with Thrips tritici Fitch, which it closely resembles. 
A critical comparison, however, of the two forms proves the California 
insect to be a different species. The most marked differences, insig- 
nificant as they may appear, are the much larger eyes, shorter head, 
much longer terminal joint of the antenna?, and the stouter and more 
prominent bristles of the head, thorax, and wings of the Californian 
species. 
Euthrips occidentals sp. nov. 
Length, 0.9 to 1.2 mm . General color, orange yellow, with the posterior margin of the 
abdominal segments broadly dusky or blackish. Eyes hairy, black. Ocelli reddish. 
Antennae dusky, with base and tip of the joints paler. Wings yellowish, the spines 
and fringes blackish. Head twice as broad as long. Eyes very large, occupying 
about two-thirds or more of the sides of the head, and coarsely granulated. Head 
and pronotum transversely striated. Joints 3 and 6 of the antenna? longest and 
nearly subequal in length; the third with a short though distinct pedicel. Joints 
2, 4, and 5 next in length, also subequal. The last two joints, usually termed the 
" stylus," are smallest, though the last is considerably longer than the penultimate 
one. Joints 2 to 5 bear each about six bristles around the apex and the sixth about 
the same number around the middle. Besides these bristles, there may be noticed a 
pair of stout, bluntly pointed, curved, sensorial spines, near the end of joints 3 and 
4, originating from a rather large, membranous sj)ot, similar to those organs in Thrips 
tritioi. 
THE ONION THRIPS. 
{ Thrips tabaci Lindeman.) 
Limothrips tritici (Fitch) Pack., Second Ann. Eept. Insects Mass., pp. 5-8, 1872. 
Thrips tabaci Lindeman, Schaxll. Ins. d. Tabak in Bessarabien, pp. 51-76, 1888. 
Limothrips allii Gillette, Bull. 24 Agr. Exp. Station Colorado, p. 15, 1893. 
TJirips allii Gillette, Osborn and Mally, Bull. 27 Iowa Agr. Coll. Exp. Station, p. 139, 
1895 
The earliest record of the so-called " onion Thrips " which I have 
been able to find was published by Dr. A. S. Packard, in 1872 (Second 
