2 Myron Harmon Szveiik 



forms. At the same time useful records of other species of 

 nearctic bees based on specimens at hand will be appended after 

 the treatment of the local species, and such new forms as may 

 occur in this material will also be described and named. 



TERMINOLOGY 



In the present paper, as well as in the others of the series to 

 follow, the writer will deviate from the terminology previously 

 employed by him in taxonomic papers on bees and still in current 

 use by most other workers in the Apoidea, principally to the 

 extent of adopting the nomenclature of the thoracic sclerites re- 

 cently proposed by Snodgrass (Bulletin i8, technical series, 

 Bureau of Entomolog}', pp. 53-59, and Proceedings U. S. 

 National Museum, XXXIX, pp. 37-91). The chief changes of 

 importance to taxonomists are these : The sclerite formerly called 

 simply " mesonotum " or even " mesothorax " is here called the 

 mesoscutum, while that previously termed " scutellum " here be- 

 comes m'esoscutellum, that termed " postscutellum " becomes 

 metanotiim, that termed "metathorax" becomes propodeum and 

 the old term " pleura " is here considered to embrace the pro- 

 pleura, mesopleura and metapleura, the latter with an upper and 

 a lozver plate. The term basifarsiis, proposed by Cockerell, is 

 adopted for the basal joint of the hind tarsus. In the wing veins 

 the old names used by Cresson and most authors following him 

 are used here, in the belief that they are more easily learned and 

 comprehended by the beginner in taxonomy, though the sym- 

 bolical terminolog)- has the advantage of reflecting homology. It 

 should also be mentioned that in the present paper especially, in 

 all comparisons between the length of antennal joints 3 and 4 the 

 measurements taken are the shortest length of joint 3, usually 

 the under inner side, with the length of joint 4 taken in the same 

 plane, as was done by Cresson in his descriptions of Nomada 

 species years ago {Transactions American Entomological Society, 

 VII, p. 72). 



