18 



Indian Economic Entomology , 



[ Vol. IL 



From the Calcutta Agri-Horticultural Society were received, in the 



early part of July 1890, blighted indigo 



shoots, with the information that, according 



to an estimate made by Messrs. Jardine, Skinner & Co., the indigo crop 







\ ' 



in Bengal has been reduced by about one-third this season, the loss, 

 which amounts to several lakhs of rupees, being ascribed to blight. 

 The indigo shoots were found to be covered with minute black scales, 

 each containing a partially developed homopterous insect, which was at 

 first supposed to be one of the Aphidse, but which has since been 

 described by Mr. G. B. Buekton as the pupa of a new species of 

 Psyllidse, which he names Psylla isitis. The description kindly furnished 

 by Mr. Buekton is as follows :— 



Psylla isitis, nov. sp. 



" Pupa. — Colour shining yellow with the edges of the ahdominal somatic rings rich 

 brown. Vertex bristly, eyes angularly facetted, large and red. Kostrum short and 

 stout, proceeding from between the eyes, and lying between the fore coxse. Pronotum 

 corrugated and tuberculosa. Antenna with eight joints, the two basal joints stout 

 and somewhat globose ; the third and eighth joints the longest. Wing-cases double, 

 but not separate. Abdomen globose, the somata edged with rich brown, and marked 

 with stigmata. Tarsus obscurely two-jointed, ending with one claw and two bristles. 

 The larval form is smaller than the pupal, and has less developed antennae and feeto 

 Size 0-05 X 0-03 of inch." 



