OSBORN AND BALL STUDIES OF NORTH AMERICAN JASSOIDEA. 45 



STUDIES OF NORTH AMERICAN JASSOIDEA. 



BY HERBERT OSBORN AND ELMER D. BALL. 



The studies recorded in this paper may be considered a continua- 

 tion of those presented before the Iowa Academy of Sciences and pub- 

 lished in Vol. IV., p. 172, (1897) under the title " Contributions to 

 the Hemipterous Fauna of Iowa." 



As in that paper, the special effort has been to detail the life-his- 

 tories of the various species and is mainly concerned with common 

 species occurring in Iowa; but in a number of instances it has been 

 necessary, in order to present a systematic arrangement of the known 

 forms, to include the species occupying all portions of North America 

 and in some instances to describe those which are new to science. 

 The studies have been prosecuted primarily for the purpose of deter- 

 mining the economic relations and importance of this group of insects 

 and securing such facts as may furnish a scientific basis for dealing 

 with those that are injurious to crops of the State. A paper dealing 

 more particularly with the practical questions involved will appear in 

 the report of the Iowa Experiment Station for 1897. 



A REVIEW OF THE NORTH AMERICAN SPECIES 

 OF AGALLIA. 



The members of this genus are all small and sombre-colored; the 

 individuals of a species vary little in pattern, but much in depth of 

 color; the males are invariably smaller and darker than the females. 

 They are all single-brooded as far as known, the larvae being usually 

 found in the rubbish on the ground around the base of their respective 

 food plants from which they emerge to feed, those of the first two 

 groups maturing in the fall and passing the winter as pupae to issue as 

 adults in early spring; those of the third group occurring in early 

 summer, the adults appearing m July and August and hibernating to 

 deposit eggs in early spring. 



[ Proc. D. a. N. S., Vol. VII.] 6 [December 14, 1897.] 



