234 GEORGE H. HORN, M. D. 



cult, if not impossible, to say what should be called Chrysodina and 

 what Nodonota. As far as our species are concerned, those of the 

 latter genus have a distinct basal marginal line to the thorax which 

 is not seen in Chrysodina, and the third joint of the antennre obvi- 

 ously longer than the second. 



Occurs from the Middle States to Colorado and Arizona. 



M03V0GRAPH OF THE IVORTIl AMERICAN SPECIES 

 OF TACHYTES. 



BY WILLIAM J. FOX. 



The North American species of this genus have never been mono- 

 graphed. The only important paper published relating to our spe- 

 cies is by William H. Patton,* in which that author gives a history 

 of the genus and a catalogue of the American species. I have been 

 aided greatly in my work by having before me the types of Cresson 

 and Patton, these authors having described two-thirds of the here- 

 tofore known species. To Mr. E. T. Cresson I am indebted for the 

 use of the material belonging to the American Entomological So- 

 ciety (the collection of that society lacks but one species to be com- 

 pleted) and to Prof. C. V. Riley for the loan of the United States 

 National Museum's collection, which is also very complete. The 

 types of all the new species are in the former collection, with excep- 

 tion of T. calcaratus, which is in the National Museum. I am also 

 indebted to Mr. William H. Ashmead, for favors received. In dis- 

 tinguishing the species it will be found necessary to open the mandi- 

 bles, and in some cases to remove some of the hair on the clypeus, 

 so that the clypeal teeth may be distinguished. 



TACHYTES Panzer. 



Tachytes Pauz., Krit. Rev. ii, p. 129, 1806. 



Lyrops Illig. Ross., Faua. Etnisc. ed. 2. ii, p. 161, 1807. 



Tnchyptera Dahlb., Hym. Eur. i, p. 133, 1845. 



Tachytes Kohl., Verb. Zool.-Bot. Gesell. Wieii, xxxiv, p. 327, 1884. 



Body generally stout. Anterior femora of male without or with 

 an emargination or excavation near the base on underside.f Spines 

 on the first joint of fore tarsi short, stout, not flexible. Pygidial 



« Proc. Bost. Soc. Nat. Hist. vol. xx, p. 391, 1880. 



f According to Kohl (Verb. Zool.-Bot. Gesell. Wien, xxxiv, p. 328) T. auru- 

 lentus was the only species of Tachytes having the fore femora emargiiiate near 

 the base. About one-half our species possess this character. 



