34 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



simihir differences between the sexes occur in C. viduatur of Europe^ 

 The neuratiou is precisely {ilike in both sexes; that Loew described 

 them under two geuera is sufficient evidence of the valuelessness of the 

 characters upon which Ortlioneura is based. 



It seems very probable that Walker's Antitheus is this species, yet it 

 is not at all certain, and it would be imprudent to substitute the name ; 

 nor should it be, indeed, were the type to prove this supposition correct. 



Chrysogaster nigrovittata. (Plate II, figs.ll, 1"2.) 



Orthonenra nifjrovUtaia Loew, Zeitschr. I'lir Natnrw., 1876, 378. 

 Chrynogaater niyrooUfatan Willistou, Proc. Am. Pbil. Soc, xx, 304. 



Habitat. — Washington Territory, California, Colorado!. 



^ , 9 . Length, 5™"'. Antennae yellowish red, the first joint and upper 

 part of third dark or blackish ; the first two joints short, the third oval. 

 Face bluish greenish black, considerably projecting below ; on the up- 

 per part with delicate transverse striae; a narrow silvery white cross 

 band of dust extends between the eyes immediately below the antennae, 

 in the middle less distinct. Frontal triangle pitted in the middle, some- 

 what swollen, with black pile. Eyes unicolorous, contiguous in the 

 male for a considerable distance. Front in female rugose on the sides, 

 narrowed above, in the middle with a slender smooth longitudinal space. 

 Dorsum of thorax finelj'^ punctulate, deep green, with four blackish 

 stripes, in some reflections a little copi^ery. Abdomen deep greenish 

 sub-opaque, the margins shining metallic. Legs wholly black, with a 

 greenish cast. Wings with a slightly blackish tint; stigma dark brown- 

 ish; cross vein at outer part of discal cell nearly straight, the last section 

 of the fourth vein bent inward near the middle, the anterior end joining^ 

 the third before the tip of the se^aond vein. 



Six specimens from California, two from Washington Territory, and 

 four from Colorado (H. K. Morrison). 



Chrysogaster stigmata. (Plate II, fig. 8.) 



Chryaogaster sligmatua Williston, Proc. Am. Phil. Soc, xx, 303. 

 Ortlioneura sinuosa Bigot, Aunales Soc. Ent. France, 1884, 556. 



Habitat. — California ! . 



5,9. Length, 6 to T™"". Antennae black, about as long as to the tip 

 of epistoma, the second joint about one-third as long as the third. Face 

 do<'p shining green, with delicate striae on the upper part, smooth be- 

 low, with si)arse white jjile, and a silvery triangle above near the orbit; 

 gently convex, the lower part abruptly and moderately produced down 

 wards and forwards. Frontal triangle like the face, only slightly swol- 

 len, with a distinct pit in the middle above the antennae; vertical tri- 

 angle greenish black, obtuse in front. Front in feniale broad, with very 

 distinct lateral transverse furrows. Dorsum of thorax deep shining 

 green, with short whitish pubescence. Scutellum distinctly grooved 

 before its tip. Abdomen flat, broadly oval, with delicate white pubes- 

 cence; the dorsum black with a greenish cast, the sides broadly, and 



