THE PEZOMACHINI OF NORTH AMERICA.^ By E. H. Strickland. The following paper is based mainly on the unnamed collec-tion of the genus Pezomachiis belonging to the U. S. National Museum, which was very kindly lent to me during the spring of 1911. The bulk of the collection of 317 specimens was com-posed of two species, namely : Pezomachus flavocinctus Ashm. 112 specimens cf and 9 , and Pezomachus nigrellus Ashm. 60 specimens cf and 9 . The former proved to be the most interesting since the hitherto undescribed male yielded a unique condition of polymorphism, fully described later in the descrip-tion of the species, and in several cases a hyperparasite, Hemiteles sp. was bred from the same egg cocoons as individuals of this species. Many other already described species of Pezomachus were represented as were also 12 apparently new species. I am also indebted to Mr. H. L. Viereck of the National Museum for a small collection containing one new species, and to Dr. W. E. Britton, State Entomologist of Connecticut for a similar collec-tion containing two new species of Pezomachus and one new Thaumatotypus. In working these over I found several cases in which two distinct species had received the same name, while some cases of wrong generic determination were noticed, which in the following pages I have attempted to correct. My thanks are due to Mr. C. T. Brues for help received in generic determinations. The tribe Pezomachini of Ashmead-included all Cryptines in which the metathorax is not areolated, or at most with only a transverse carina, and consisted of the following genera. Thaumatotypus Forster. Cremnodes Forster. Apterophygits Forster. Aptesis Forster. Theroscopus Forster. Pezomachus Grav. Pezolochiis Forster. Hemimachus Ratz. ^Contributions from the Entomological Laboratory of the Bussey Institution,. Harvard University, No. 45. 2Proc. U. S. Nat. Mus. Vol. XXIII, p. 3G (1900). 113
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