July 1S90.] 



PSYCHE. 



Zll 



Palpi brown, with white hairs. Face, 

 front and occiput metallic green, covered 

 with yellowish dust, the separate scales com- 

 posing which are distinctly discernible as in 

 the preceding species. Antennae black, 

 resembling in structure those of A. ivillia- 

 tout. Cilia of the inferior orbit yellow. 

 Thoracic dorsum bright metallic green with 

 bluish reflection; the thin covering of dust 

 and the comparatively few setae yellow; 

 prescutellar depression very distinct, some- 

 what V-shaped; pleurae vivid metallic green, 

 covered with a thin layer of yellow dust. 

 Tegulae pale yellow, cilia yellow, changing to 

 brown in some lights. Scutellum and abdomen 

 vivid metallic green with violet and cupreous 

 reflections, the rather long hairs on the latter 

 pale yellow; venter and hypopygium black, 

 the latter roughened, metallic green dorsal- 

 ly; appendages pale yellow. The capsule of 

 the hj'popygium is narrower and somewhat 

 longer than in the preceding species; the 

 long, blade-shaped appendage dark brown ; 

 the two lamellae dirty yellow with black tips, 

 apparently without cilia on their edges. In 

 the male, coxae and legs black, the former 

 with yellow, the latter with black hairs. 

 Femora with a faint metallic green luster; 

 knees broadly yellow; trochanters, inner 

 faces of the tibiae and bases of the separate 

 tarsal joints dirty jeilow. In the female the 

 femora and tibiae are bright metallic green, 

 the knees and trochanters yellow, the tarsi 

 black. Halteres pale yellow. Wings faintly 

 brownish hyaline; third and fourth longi- 

 tudinal veins less approximated than in the 

 preceding species; perfectly parallel and but 

 very slightly curved from the posterior cross 

 vein on. The fourth longitudinal vein termi- 

 nates in the tip of the wing. 



Habitat: Milwaukee Co., Wis. 



This species is very readily distin- 

 guished from A. ■willistoni by its smal- 

 ler size, the more bluish and less- golden 

 reflection of its metallic surfaces, its 



dark-colored legs and the neuration of 

 the wings. Three males and one fe- 

 male were taken with the preceding 

 species. 



Xantiiochlorus helvinus, Loew. $ . 



Loew felt some doubt as to whether 

 this species, wliich he described from 

 female specimens only, was not merely 

 a variety of the European X. tenellus. 

 An examination of a number of males 

 taken by me in several localities in the 

 vicinity of Milwaukee, seems in no way 

 to invalidate the species. In these spec- 

 imens I can tletect no green markings 

 whatsoever. The general honey yellow 

 color of the body is departed from only 

 on the cheeks and front, which are has 

 gray and on the pleurae, where I find 

 two clearly defined black spots ; one 

 larger and more pronounced just back 

 of the tegula and another smaller and 

 more oval spot (not mentioned in 

 Loew's description) on the metathorax 

 just beneath the lateral qA'^q of the scu- 

 tellum. The powerful bristles on the 

 head and thoracic dorsum, as well as 

 the cilia of the tegulae and the hairs 

 covering the other portions of the body 

 are dark brown, almost black, thus con- 

 trasting with the yellow body color. 

 The hypop3'gium is prominent, though 

 hardly " dick angeschwollen" as is the 

 case in the European X. tenellus^ 

 Wied, according to Schiner. The 

 acute hypopygial appendages scarcely 

 project and are honey yellow. The 

 bases of the second, third and fourth 

 abdominal segments are infuscated in 

 dried specimens. 



