392 



Some short and stiff hairs, becoming more numerous toward the end of the body 

 may also be observed near the posterior hiteral 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 transiuittetl to the Department of 

 Agricultare 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 si)ecies has been considered as being 

 probably identical with Thrips tritici Fitch, which it closely resembles. 

 A critical comiiarison, 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 

 jjrominent bristles of the head, thorax, and wings of the Californian 

 species. 



Euthrips occidentalis sp. nov. 



Length, 0.9 to 1.2""". General color, orange yellow, with the posterior margin of the 

 abdominal segments broadly dusky or blackish. Eyes hairy, black. Ocelli reddish. 

 Antennio 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 antennrs 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 spot, similar to those organs in Thrips 

 tritici. 



THE ONION THRIPS. 



{Thrips tabaci Lindemau.) 



Limothrips tritici (Fitch) Pack., Second Ann. Eept. Insects Mass., pp. 5-8, 1872. 

 Thrips tabaci Lindeman, Schadl. Ins. d. Tabak in Bessarabien, pp. 51-76, 1888. 

 Limothrips allii Gillette, Bull. 24 Agr. Exp. Station Colorado, p. 15, 1893. 

 Thrips alia 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 



