‘ 
158 Report oF THE ENTOMOLOGIST OF THE 
Complete descriptions may be found in the following works : 
Aphis dianthi, Scar.: Die Pflanzenleuse, C. L. Koch, pp. 
49-44 (1857). | 
Aphis rapae, Curtis: Farm Insects, John Curtis, F. L. §., ete., 
p. 68 (1870). 
Lthopalosiphum diantht Scax.: Monographie der Familien 
der Pflanzenleuse, J. H. Kaltenbach, pp. 42-44 (1872). 
Lhopalosiphum dianthi Scur.: Monograph, British Aphids, 
Geo. B. Buckton, pp. 15-21 (187¥). 
Lhopalosiphum dianthi Scur.: Aphididae Minn. Oestlund 
(1880). 
ONION THRIPS. 
Thrips ali (GitLetTE), Bracx. 
(Ord. Paysopupa; Subord. TreresrantiaA; Fam. STENoPTERID#.) 
This insect, though known as “ Onion Thrips,” because first 
described from onion, might properly be called “ Cabbage Thrips.” 
Ata preliminary meeting of the prominent farmers of Long 
Island, July 2ist, when the work of the sub-station was com- 
menced, Mr. J. W. Cain mentioned that a rust was injuring the 
cabbage. Opportunity to examine this “rust” was found the 
same day. It proved not to bea rust but the work of a species 
of thrips. Specimens of this were submitted to Miss Alice M. 
Beach, of the lowa Agricultural College, who pronounced them 
Thrips alii. Later in the season specimens of Thrips ali were 
found on onions here and compared with fresh specimens from 
cabbage proving them to be identical. 
Their injury is confined principally to the outer leaves of the 
cabbage. In ordinary seasons they will probably cause no 
marked damage, though the past fall their injury was sufficient 
to cause the outer leaves of the second crop of cabbage to die. 
Onions is the crop that they injure principally, especially in 
sections where the crop is not harvested till October. In sections 
like Long Island, where the crop is started in the fall and 
harvested earlier in the season, probably they will not be a seri- 
ous pest, though the past fall some fields of young plants showed 
the “white blight,” which is caused by this insect. eating the 
green portion of the leaves. In fact they apparently left the 
cabbage the latter part of September and went to onion fields 
