140 PROCEEDINGS ENTOMOLOGICAL SOCIETY 







one measurements of females reared from stems of Elymus con- 

 densatus collected at the same place and same time, thirteen 

 had the postocellar line shorter than the ocellocular line, five had 

 the two lines subequal, and three had the postocellar line longer 

 than the ocellocular line. And in this series of measurements 

 there was all degrees of differences so in some cases the smallest 

 fraction of a millimeter would have placed the individual in the 

 other series. The other structural variation consists in the extent 

 of the depression in front of the anterior ocellus, in the smaller 

 individuals it is very restricted while in some of the larger ones it 

 extends to the position the middle foeva would occupy. 



The range of variation in color is great but all of the extremes 

 and necessary intermediates were found in the series from Ely- 

 mus condensatus. The face in the female may be mostly yellow 

 but normally it is black. The scutellum may be mostly yellow, 

 or with two spots, but in most specimens it is black. The venter 

 is usually marked with yellow but in a few specimens it was 

 entirely black. The femora are usually mostly yellow but in 

 some of the specimens (usually smaller individuals) they are 

 almost entirely black and there is every degree of variation be- 

 tween. The wings vary from hyaline to distinctly infuscated. 

 The antennae are usually 20 jointed, but in some specimens there 

 were only 18 joints. The banding of the tergites is extremely 

 variable. 



Specimens reared from the stems of the following have been ex- 

 amined: Elymus sp.; Elymus condensatus; Elymus canadensis; 

 Agropyron smithii; Phleurn pratense: and wheat. 



Specimens from California, Utah, Colorado, Montana, Wis- 

 consin, and Manitoba. This species has a more extended range 

 but inasmuch as it will be treated in an economic paper where 

 its distribution will be discussed a full account of the distribution 

 is omitted from this paper and the above discussion is based on 

 specimens from the states listed above. 



Type of cinctus Acad. Nat. Sc. Phil.; type of occidentals Cat. 

 No. 20175 LI. S. N. M.; type of graenicheri Cat. No. 6842 U. S. N. 

 M. 



Gephus pygmaeus (Linnaeus). 



This species has been treated in considerable detail in economic 

 papers and need not be discussed here. Specimens have been 

 examined from the following localities: Europe (many local- 

 ities), Ithaca, N. Y. and Ottawa, Canada. As far as the 

 American material is available it would seem that this species 

 has not spread widely nor has it been of milch economic importance 

 in recent vears. 



