454 



Journal of Agricultural Research voi. xviii, no. 9 



the humidity is greater. Sweepings by the writer in 191 7 gave numerous 

 specimens at Pass Christian, Miss., and Lake Charles, La. A few were 

 found at Marfa, Tex., Las Cruces, N. Mex., and Tucson, Ariz. ; but none at 

 Yuma, Ariz. Other species replace this one on grass at San Diego and 

 Los Angeles, Calif., but it extends from San Francisco as far south as Santa 

 Barbara. In Canada Oscinis frit occurs but sparingly in Manitoba, Sas- 

 katchewan, and Alberta but is much more numerous in the more southern 

 latitude of Ontario and Quebec. No records are available for the ex- 

 treme East. It has been reported from Juneau, Alaska, latitude about 

 58°. This is the farthest north of all existing North American records. 



The accompanying map (fig. i) has been dotted to indicate the dis- 

 tribution and approximately the abundance of the species, although in 



Fig. I. — Map showing distribution of Oscinis frit, 



many parts it is marked more from analogy than from definite informa- 

 tion. 



DESCRIPTION OF INSTARS 



EGG 



The eggs (fig. 2) are pure white, measuring 0.7 mm. in length and 

 0.178 mm. in greatest diameter, approximately straight on one side, the 

 other more curved. The surface bears nearly 20 fine ridges, running 

 lengthwise, which are occasionally broken. 



NEWLY HATCHED LARVA 



The lar\^a (fig. 3) upon emerging from the egg measures 1.06 mm. in 

 length and 0.14 mm. in greatest diameter. It is whitish and semi- 

 transparent in color, without head, rather pointed in front and truncate 

 behind. A pair of very minute, soft, 2 -jointed antennae are present. The 



