15 



Since its discovery in the District of Columbia it has been found in 

 many other parts of the country, and has evidentally been brought over 

 from Europe a number of times on independent importations of Euro- 

 pean oaks. In America it does not con- 

 fine itself to the imported species, but 

 soon becomes established on native 

 species, and spreads with more or less 

 rapidity and multiplies very greatly. 



There is a most interesting Chalci- 

 did which occurs in Europe, and which 

 was described in 1837 by Westwood 

 as Encyrtus dalmanni. This parasite 

 was subsequently placed in Foerster's 

 genus Habrolepis by Gustav Mayr in 

 his revision of the Encyrtinre of Eu- 

 rope. It is structurally a very re- 

 markable form, and is one of the most 

 beautiful species of the interesting 

 group to which it belongs. It has been 

 reared in Europe at different times by 

 Tschek, Schlechtendal, and Eeinhard 

 from an undetermined coccid upon 

 Quercus pubescens and Quercus pedun- 

 culata. Giraud also reared it from a coccid upon oak which he believed 

 to be Bouche's Aspidiotus quercicola, which was afterwards placed by 

 Signoret in his genus Asterodiaspis, and it becomes probable that the 

 unnamed hosts from which it was reared by the other authors mentioned 



Fig. 1 — Habrolepis dalmanni; side view of 

 female — very greatly enlarged (original). 



Fig. 2.— Habrolepis dalmanni; dorsal view of female— very greatly enlarged (original). 



were all this species; in fact, we can say with a reasonable degree of 

 probability that the European host of Habrolepis dalmanni is Asterodi- 

 aspis quercicola (Bouche). 



The writer had never seen this beautiful Chalcidid (figs. 1 and 2), 

 except in a single example sent some years ago by Dr. Mayr, until June 



