124 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



Material used in study. — Sixteen examples were examined, includ- 

 ing eight whole larvae and the exuviae of eight other specimens, 

 which are believed to have been reared. Only five reared adults were 

 located. These were identified by M. C. Lane, of Walla Walla, Wash., 

 and W. S. Fisher, of the U. S. National Museum. The material is 

 from 3 States: Kentucky (13) ; Clarksville, Tenn. (2) ; and Cadet, 

 Mo. ( I ) . Reared material for which associated adults are available is 

 listed below. 



6; Louisville, Ky. ; Apr. 29, 1916; all believed to have been reared, but only 3 

 adults found. (U.S.N.M. ; reared adults in W. W. collection, bearing 

 accession numbers 6154, 6155, 6161.) 



6; Lexington, Ky. ; Feb. 17, 1938; 2 reared to adults. This material was re- 

 ceived from H. H. Jewett, Agricultural Experiment Station, Lexington, 

 Ky., and is believed to be part of the material used by him in his descrip- 

 tion of this species. (Larval material in Canadian national collection; 

 adults probably in Experiment Station collection, Lexington.) 



THE LUDIUS CUPREUS GROUP 



Figures 14, g; 25, a, d, e, g, h 



KEY TO SPECIES 



1. From Europe or Asia 2 



From North America kendalli (Kirby) (p. 134) 



2. Prongs of urogomphi subequal in length (fig. 25, /t) 3 



Outer prongs at least twice as long as inner prongs;^" central Europe. . . 

 virens (Schrank) (p. 133) 



3. Not from Denmark 4 



From Denmark " pectinicornis (Linnaeus) (p. 131) 



4. Mediotergites of abdominal segments (fig. 25, d) usually with moderately 



coarse pits, especially on each anterior half; each mediotergite of 

 seventh and eighth abdominal segments (fig. 25, d) with posterior 

 transverse row of 7 or more setae ; found at altitudes from sea level 



to several thousand feet cupreus (Fabricius) (p. 126) 



Mediotergites of abdominal segments usually with smaller pits ; each 

 mediotergite of seventh and eighth abdominal segments usually with 

 posterior transverse row of 5 to 7 setae; usually below altitudes 

 of 8qo feet pectinicornis (Linnaeus) (p. 131) 



10 According to Beling (1884, p. 208, "Corymbites aeneicollis OIv."). 



11 According to Rye (1906, pp. loo-ioi) pectinicornis is the only species of 

 this group inhabiting Denmark. 



