25() AjduiIs Entomological Society of America [\'o\. XI, 



about flowers and along roadsides. So far as observed, they are 

 single brooded, the adults appearing in July anci August and, in 

 some species, hibernating. 



In considering the distribution the published papers are 

 indicated by numerals, and the available collections by letters 

 used in the same way as follows: the collection of Dr. E. D. 

 Ball, ^'; that of the Milwaukee public museum, ™; that of Prof. 

 W. S. Marshall, University of Wisconsin, "; that of the Wiscon- 

 sin Agricultural Experiment Station, ^ of Mr. Wm. J. Gerhard, 

 of Chicago, ^ and of the State Entomologist's office, including 

 the author's collections, '. These letters thus indicate for each 

 species the place of collection and the present ownership of the 

 material with which the author has been working. The state 

 names printed in Italics are now added to the distribution as 

 given by Van Duzee (1917), and localities are credited to his 

 catalogue when the present writer could find no other pub- 

 lished records for them. 



The writer is indebted to Mr. Wm. J. Gerhard, Curator of 

 Insects in the Field Museum, Chicago; to Mr. T. E. B. Pope, 

 Curator of Insects in the Milwaukee Museum; to Prof. H. F. 

 Wilson of the Agricultural Experiment Station; and to Prof. 

 W. S. Marshall of the University of Wisconsin, for their courtesy 

 in allowing material in their private collections or under their 

 charge to be freely used. Mr. H. G. Barber and Mr. E. P. Van- 

 Duzee have also kindly loaned some valuable specimens. 

 Special acknowledgments are due to Dr. E. D. Ball with whose 

 library and collections most of the work reported herein was 

 done and who has kindly aided with valuable suggestions. 

 Many of the biological notes are on his authority, in particular 

 those from Colorado. 



KEY TO TRIBES OF ALYDIX^. 



,a. Posterioi- femora not armed with spines; lateral plates of female liypo- 

 pygium (in species examined) contiguous from base to apex, mesa! plates 

 concealed or wanting. 



b. Apical .segment of rostrum twice as long as third, second longer 



than two apical segments togetlier Micrelytrini 



bb. Apical segment of rostrum subequal to third, second not longer 

 than third and fourth together; body and legs greatly 



elongated Leptocorisini 



aa. Posterior femora armed beneath with a row of spines; lateral plates of 

 Sfemale hypopygium distant, at least at base, exposing mcsal plates, 

 (except in Stachyocnemus) 1 lydini 



