S. W. Williston — North American Gonopidm. 381 



Mild two abbreviated and interrupted ones exteriorly ; pile black, 

 rather long, on the border of the scutellum with a row of hairs. 

 Abdomen often black, gray poUinose, leaving a pair of median, inter- 

 rupted, indistinct blackish stripes and minute blackish dots; fre- 

 quently the sides and tip of the abdomen are reddish or yellowish, 

 and not infrequently the entire abdomen is reddish or even yellow. 

 Legs yellow or reddish yellow, the femora often on the upper side 

 blackish or black. Wings with a brownish tinge, at the immediate 

 base yellow. 



Hab. New England, New Mexico, California, Washington Ter- 

 ritory ! 



Numerous specimens. This species is very variable. In the 

 vicinity of New Haven, and at the same time, 1 have captured 

 specimens with a yellow abdomen, much smaller than others with the 

 abdomen entirely black. The different forms insensibly merge into 

 one another. From this fact, and because I have seen specimens 

 from the Pacific coast showing all these variations, I must consider 

 Say's Z. ahdominale as nothing more than a variety. 



Zodion pygmaeum, n. sp. 



6 ? . Length, 3^-4""°. Face light yellow ; cheeks narrow, not 

 a third of the vertical diameter of the eyes. Antennae blackish, 

 the third joint at the base broadly red ; third joint longer than the 

 second. Front blackish above, yellow below. Occiput black, gray- 

 ish poUinose. Thorax black, thickly gray pollinose, in the middle 

 with two slender stripes, and on each side with two small spots, 

 opaque black. Abdomen black, on the sides and the venter yellow, 

 thickly covered above with gray pollen, leaving opaque black spots 

 as follows : Two small, triangular spots (sometimes obsolete) on the 

 posterior part of the second segment, two similar but very large 

 ones on the third segment, usually nearly completely coalescent ; two 

 pairs, successively smaller, on the fourth and fifth segments ; poste- 

 rior margins of all the segments narrowly gray pollinose ; hypopyg- 

 ium black ; in the female the spots on the second, third, and 

 fourth segments larger, the fifth segment very short and the spots 

 wanting, the ovipositor shining reddish yellow. Legs brownish, 

 whitish pollinose; the under side and tip of femora, the base of 

 tibiae, and the base of all the tarsi, yellowish. Wings hyaline. 



Hab. California and Colorado ! 



Ten specimens from California (O. T. Baron) and one from North 

 Park, Colorado (G. B. Grinnell). All males but one from California. 



