128 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



NOTES ON THYSANOPTERA. 



BY H. M. RUSSELL, 

 Bureau of Entomology, U. S. Department of Agriculture. 



The writer presents these short notes at the present time as 

 two of the species treated, Heliothrips rubrocinctusQisxdL and 

 Eiithi ips insularis Franklin, have not been recorded from the 

 United States, and the third, ^olothrips bicolor Hinds has 

 heretofore only been recorded from Amherst, Massachusetts. 



Heliothrips rubrocinctus Giard. 



This species was observed by the writer to be seriously 

 affecting the mango and avocado trees at Miami, Florida, 

 during the months of January to May, 1909. It was found 

 feeding in colonies on the foliage in all of its stages and ming- 

 ling in with Heliothrips hcemorrhoidalis Bouche. In habits it 

 was almost identical with the latter, but the younger stages 

 were readily distinguished by a bright red band crossing the 

 base of the abdomen, and the adult by its habit when dis- 

 turbed of curling the abdomen entirely over the body and 

 then moving away in that posture. 



Euthrips insularis Franklin. 



On January5, 1909, Messrs. H. 0. Marsh and D. K. Mc- 

 Millan collected this thrips in large numbers at Brownsville, 

 Texas, in the blossoms of the velvet bean (Dolichns atropur- 

 pureus). Franklin described this species from the Barbados 

 Islands, and Mr. David L. Crawford collected it at Guadala- 

 jara, Mexico, where, he stated, it was the commonest thrips 

 present. On the velvet bean, this insect was causing consider- 

 able injury by feeding on the flowers. This was indicated by 

 a brown spotting of the petals, many blossoms dropping off, 

 so that there were few pods maturing. 



.^Eolothrips bicolor Hinds. 



While Mr. M. M. High was engaged in work on the onion 

 thrips (Thrips tabaci Lind.), at Knox, Indiana, during August, 

 1911, he collected a number of specimens of this thrips. They 

 were taken in company with sEolo thrips fasciatus Fab. on 

 the onion, where they were observed to be feeding on the 

 onion thrips. 



