233 



ChRYSOTUS SPINIFER, n. sp. 



Male. — Metallic green. Frons dark metallic green, slightly gray 

 pollinose; face green, paler than frons and with denser pollinosity, 

 which is yellowish and distinctly lustrous; antennae l>lack-brown, 

 arista concolorous ; palpi white, with a distinct luster ; proboscis black ; 

 postocular cilia silvery white. Mesonotum with the green color some- 

 what obscured by brownish pollinosity, but shining; scutellum con- 

 colorous with disc of mesonotum. Tegulse and their fringe yellow. 

 Abdomen green, fourth and fifth segments cupreous on the dorsum ; 

 surface hairs brown. Legs metallic green, the knees yellowish, tarsi 

 brown ; in some lights the tibice brown on ventral surfaces. Wings 

 clear, veins black. Bristles black. 



Frons about one third the head-width, the face very little 

 narrower, the latter slightly narrowest at center ; antennae of moderate 

 length, third joint reniform (PI. XIII, Fig. 9) ; palpi large and leaf- 

 like (Fig. 8), at the broadest part as wide as face; postocular cilia 

 very long and beardlike. Bristles on mesonotum strong, acrostichals 

 indistinguishable; basal pair of scutellar bristles very weak and hair- 

 like. Abdomen with rather strong surface hairs; ventral organs of 

 the hypopygium small. Legs slender ; fore tarsus slightly longer than 

 tibia; mid pair about equal in length to their tibia; hind tarsus barely 

 two thirds the length of the tibia; mid tibia with one strong bristle 

 at about the basal third on the anterior surface, and three setulse 

 almost on the dorsal surface, the one farthest from base, and largest, 

 being just about the middle ; antero-dorsal surface of hind tibia with 

 one bristle at basal third and another at middle, the antero-ventral 

 surface with a series of 4-5 setulse from before middle to apex, 

 increasing a little in length as they near apex, the postero-dorsal 

 surface with a series of 5-6 bristles the whole length of the tibia; 

 basal joint of hind tarsus as in Figure 10, Plate XIII, with a strong 

 ventral bristle; surfaces of all legs with short hairs. Cross vein at 

 wing-middle; veins 3-4 slightly convergent. 



Length, 2.75 mm. 



Locality, Algonquin, Illinois (Nason). One male. 



Diaphonts simpler Aid. has a ventral spine on the hind metatar- 

 sus, but the venation, palpi, etc., are quite different. The species de- 

 scribed herewith is difficult to place in either Diophonis or Chrysotus, 

 but I consider it has closest affinities with the latter. 



Chrysotus anomalus, n. sp. 



Male. — Frons black, with a slight greenish luster; basal joint of 

 antennae pale yellow, the other two joints black; face brownish, with 



