1913] North American Dipterous Genus Neurigona 53 



black, with delicate hairs; pleura blackish metallic green, thickly cov- 

 ered with white dust; metathoracic epimera dark brown. Coxae yellow, 

 fore and middle pairs with prominent black bristles on their anterior 

 surface near their tips, hairs on upper portion of fore coxae delicate and 

 pale, hind coxae with a single black bristle on its outer surface. Legs 

 pale yellow, with black hairs, tarsi infuscated towards their tips, fore 

 tarsi scarcely twice as long as the fore tibias, middle ones one and one- 

 third times as long as the middle tibiae, hind tarsi scarcely as long as the 

 hind tibiae, hind metatarsi distinctly shorter than the succeeding joint. 

 Wings grayish hyaline with a yellowish tinge, broader in the middle, 

 slightly narrowed towards the base; distal seg-ment of fourth vein 

 moderately bent forwards near its middle and ending not very close to 

 the third vein; distal segment of fifth vein nearly two and one-half 

 times as long as the posterior cross-vein. Halters and tegulae dark 

 brown, the latter with pale cilia." 



I have not seen this species and have copied this from 

 Prof. Wheeler's description, vi^hich was made from a single 

 female specimen taken sweeping in pine woods at Monterey, 

 Cal., July 22, 1896. 



25 Neurigona lateralis Say. 



Figure 25. 



Medeterus lateralis Say, Proc. Acad. Nat. Sci. Phila., Vol. vi, p. 169, 1829; 

 Compl. Works, ii, p. 362. 



Saucropus superbiens Loew, Mon. N. A. Diptera, ii, p. 227, 1864; Neue Beitr., 

 vol. viii, p. 76, 1861. 



Dactylongia gracilipes Aldrich, Kans. Univ. Quat., vol. ii, p. 151, 1894. 



Thorax verdigris green; abdomen yellow with more or less brilliant 

 metallic green; hypopygium yellow; front metatarsi longer than their 

 tibiae remaining joints very short; first joint of hind tarsi longer than 

 second. Length of male 2-3 mm., female 2^-3^ mm. 



Male: Face narrow, silvery white, its sides nearly parallel; palpi and 

 proboscis yellow; antennae yellow, third joint a little infuscated, arista 

 dark brown; front blackish, occiput greenish, both thickly covered with 

 white pollen; frontal bristles black, orbital cilia whitish. Thorax dark 

 verdigris green, somewhat coppery on the sides, grayish pollenose, 

 except a narrow central line between the acrostichal bristles; scutellum 

 more blue green, thickly gray pollenose; pleurae and metanotum green- 

 ish black with whitish pollen; metathoracic-epimera yellow. Abdomen 

 yellow on the venter and lateral margins, generally the dorsum of the 

 first segment more or less yellow, fifth yellow on the hind margin, and 

 usually some of the incisures yellow, the rest brilliant metallic green, or 

 blue green, rarely coppery, sometimes the green reduced to lateral 

 spots, in one female before me there is scarcely a trace of green, but four 

 lateral coppery spots; hairs of the abdomen pale; hypopygium rounded, 

 yellow, with whitish appendages. Legs pale yellow; all the fifth tarsal 

 joints black; front coxae with long delicate yellowish hairs on the front, 

 and a few yellowish bristles near the tip, these bristles blackish in 

 certain lights; middle coxae nearly bare; front metatarsi longer than 



