390 CHITTENDEN: SPECIES OF PHYLLOTRETA 



subequal in length ; 3 and 4 subtriangular ; 3 distinctly wider ; 4 much 

 wider ; 5 depressed, wider than 4, about one-half longer than wide, ante- 

 rior ace shorter than posterior, nearly straight ; 6 short, basal part gen- 

 erally pale and apical piceous. 



Female: Last ventral segment simple and shorter. Antennae as 

 in zimmermanni and vittata. 



Length, 2.5-3.0 mm.; width, 1.4-1.5 mm. 



Logan, Utah (type locality), July 9-12, 1906; June 20, 1904; Alta, 

 Utah, June 29 (E. D. Ball and E. G. Titus); Park City, Utah, June 17, 

 (Hubbard & Schwarz); Elko, Nev.; Corvallis, Ore. (C. F. Moznette.) 



Type No. 23114, IJ. S. National Museum. 



A good series of specimens shows considerable variation. One 

 individual has all antennal joints piceous and another has bluish 

 elytral humeri. The general appearance and punctation are 

 similar to zimmermanni. In addition to the distinctive characters 

 of the antennae (the fifth joint is flat, not bowed) and last ventral 

 segment of the male, the elytral vittae are quite difTerent from 

 other species, approaching zimmermanni, but pale, not distinctly 

 yellow as in that species. It is also larger than the latter, which 

 measures only 2-2.5 mm. 



This species was observed by Prof. E. G. Titus and Dr. E. D. 

 Ball at Logan, Utah, in June, 1904, attacking sugar beet. It 

 was abundant in a beet field overgrown with hedge mustard, on 

 which it was also taken. 



