286 S. W. WILLISTON, M. D. 



eyes in profile. Scutellum small, somewhat thinned. Abdomen con- 

 tracted on the basal segments, the greatest width attained on the 

 fourth ; convex transversely. Hind femora much thickened in both 

 sexes, with bristly spines below ; front tarsi elongate and flattened 

 in both sexes. AVings folded in repose; neuration as ii; Xylota; 

 anterior cross-vein oblique, joining the fourth vein a little before the 

 middle of the discal cell. 



In addition to the species described below, the genus will probably 

 include Xylota coardata Wied. 



86. Ceriogaster foscithorax n. sp. 



% 9.— Length 7—8 mm. Face, froutal triangle, and vertical triangle (except 

 the ocelligerous tubercle) with a golden sheen ; a median stripe and a stripe on 

 the cheeks shining black ; in the female the pollen of face and front is of a 

 lighter color, with a narrow opaque band on the upper part of the front. An- 

 tennae yellowish brown. Thorax opaque black ; mesonotum with two narrow, 

 golden opaque bands, one toward the front margin, the other on the suture, and 

 both interrupted in the middle; a small narrow spot of the same color on the 

 posterior margin of the mesonotum. Scutellum opaque black, the margin more 

 or less metallic. Abdomen moderately shining black ; the fourth segment bright 

 brassy metallic, thickly clothed with short golden pile; in the female the first 

 segment on the sides, and the third, except a large triangular spot behind, me- 

 tallic green, the black opaque, and the second segment in front with two reddish 

 spots. Legs: femora mostly black, the four hind tibite and tarsi deep red or 

 pitchy ; the front tibiae distally and front tarsi deep opaque black. Wings 

 clouded with blackish distally, the stigma deep brown. 



Two specimens, Corumba and Rio de Janeiro. 



€ERIA. 



TABLE OF SPECIES. 



1. Antenoal process as long as first joint of antennaj (red species with yellow 



™^'l^"igs) Ivynchii n. sp. 



Antenual process one-half or one-third as long as the first joint 2. 



2. Second segment of abdomen long and slender, only a little dilated behind 



(black with yellow markings) 3 



Second segment narrow in front, of nearly the full width of abdomen behind '; 

 not elongate , 



3. Second joint of antennae longer than the first, third short...Sackeuii n. sp. 

 Second joint shorter than the first ; yellow stripes of face slender. 



IVIikii n. sp. 



4. Abdomen red throughout ; thorax black Brauerii n. sp. 



Abdomen black, with or without bands 5 



