1913] North American Dipterous Genus Netirigona 51 



22 Neurigona bivittata n. sp. 



Figure 22. 



Thorax dark reddish yellow, almost brown, with thick gray pollen, 

 and two brown vittae. Abdomen yellow banded with black. Length 

 5 mm. 



Female: Face broad, whitish pollenose, the yellow ground color 

 showing through in the specimens before me, especially below the suture, 

 antennas with the first two joints pale yellow, the third more orange 

 yellow, arista brown; front and occiput black, thickly white pollenose; 

 orbital cilia whitish. Dorsum of the thorax dark reddish yellow, almost 

 brown, and somewhat livid, but so thickly covered with gray pollen as 

 to hide the ground color in unrubbed specimens, humeri pale yellow, 

 there are two brown vittse running from the front of the mesonotum to 

 the flattened space before the scutellum. They are just outside of the 

 acrostichal bristles, leaving the space between these bristles gray 

 pollenose; these vittffi are wider posteriorly and not so sharply defined; 

 pleuree blackish with a reddish or livid tint, and thickly covered with 

 white pollen; scutellum pale yellow; metanotum black with white 

 pollen. Abdomen yellow with black bands at the base of second to 

 fifth segments, these bands narrowed laterally, and emarginate at the 

 center of the dorsum; venter yellow; hairs of the abdomen black; the 

 long bristles on the first segment have a yellowish color in some lights. 

 Legs pale yellow; front coxs with very short hairs on the front side, 

 which appear dark colored, and with one yellow and several brown 

 bristles near the tip, the brown bristles having more or less of a yellow 

 color in certain lights; middle coxae with black hairs and bristles which 

 are more abundant than in some species; front femora, tibiae, and 

 metatarsi about equal in length, the last four joints of the front tarsi 

 together about the same length as the metatarsi; middle metatarsi 

 shorter than their tibiae; hind tarsi about equal to their tibiae in length, 

 the second joint distinctly longer than the first; last joint of all the tarsi 

 slightly infuscated. There are the usual whitish bristles above the front 

 coxae. Wings grayish hyaline; veins yellowish brown; anal angle not 

 prominent; tips of the third and fourth veins well separated, the fourth 

 ending in the tip of the wing. Halters short, with the knob large. 



Described from two females. The type specimen is labeled 

 Colorado; the other is from Bear Lake, B. C, and was taken by 

 R. P. Currie, July 20, 1903; both of these specimens are in the 

 National Museum collection, 



23 Neurigona tarsalis n. sp. 



Figure 23. 



Thorax black ; abdomen yellow with three black bands ; hypopygium 

 yellow and black; third joint of front tarsi pure white, fourth and fifth 

 joints black and flattened. Length 4^ mm. 



Male : Face narrow in the center, a little wider above and below; face 

 and palpi silvery white; proboscis and antennae yellow, arista brown; 

 front and occiput black, thickly covered with white pollen; orbital cilia 



