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ENTOMOLOGICAL SOCIETY 



have taken specimens from the leaves of black alder as early 

 as May and late in September. The insect hibernates in the 

 adult stage under fallen leaves and in the crevices of the bark. 

 The eggs of this tingis, which I found on the black alder, 

 are shaped like the eggs of those known to be on oak and are 

 only a trifle larger; this insect has, also, the same habit of 

 depositing its eggs on the underside of the leaves, fastening 

 them to the surface, differing however in that it completely 

 hides them under the dense pubescence of the leaf, in the 

 axil which is formed by the main rib and its side branches. 

 In this way the eggs are entirely out of sight and well 

 protected. 



/7 



FIG. 3. Corythuca pergandei: Young larva or nymph at right, older nymph at left, 

 enlarged spine between. 



The larval forms (fig. 3) are quite similar to those of the 

 oak tingitid, except that the body appears to be less broad. 

 They are armed with the same kind of spines, which Dr. A. 

 W. Morrill in his excellent treatise on the immature stages 

 of some tingitids a has termed " trumpet-shaped spines, type 

 No. I, type No. 2, and simple spines, type No. 3." These 

 spines arise from elongated, thick protuberances, or from a 

 conical base, and are situated on the head, at the margins of 

 thorax, and on the dorsal part and sides of the abdominal 



a Psyche, Vol. x, No. 324, pp. 127-134, August, 1903. 



