Insecutor Inscitiae Menstruus 



Vol. I MAY, 1913 No. 5 



NOTES ON THE COCOONS OF SOME OF THE 

 SPECIES OF THE GENUS ACROBASIS, AND DE- 

 SCRIPTIONS OF THREE NEW SPECIES, FROM 

 EAST RIVER, CONNECTICUT 



By CHAS. R. ELY 



During the summer of 1912 the writer was fortunate in finding a num- 

 ber of species of Acrobasis quite abundant in East River, Connecticut. 

 A study of the cocoons formed by those species that attach them to their 

 respective food plemts showed a great diversity in the form, coloring, etc., 

 of the cocoons. Ineismuch as it is frequently easy to identify a given 

 species by means of its cocoon alone, in cases where several species have 

 the same food plant.it seemed desirable to publish the observations made. 



Acrobasis feltella Dyar. 



This species was seiid, in the original description, to have been bred 

 from liurae boring in the petioles of the leaves of hickory. On June 28 

 a number of cocoons were found on hickory from which there was 

 obtzdned, e£urly in July, a good series of A. feltella Dyar. 



The cocoon of this insect is quite small, straight, about 1 mm. long 

 by 3 mm. in diameter, tapering toward the base and ending, at the oppo- 

 site extremity, in a nearly cylindrical prolongation which is roughly fin- 

 ished with frass. This is in contrast to the smoother surface of the rest 

 of the cocoon, which is dull yellowish in color. It is attached to the 

 midrib of a leaflet, on the under side, not far from its base. The leaflet 

 is slightly drawn down, not folded or drawn together, so as to present a 

 characteristic concave appearance, by means of which the leaves so 

 affected can easily be recognized. 



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