110 '0. Kröber: 
thoracic stripes. It is not at all improbable, that the names may 
prove to be synonymous.“ U. St., N. Mexico, Tepetlapa in Guerreo. 
13. Physocephala sororeula Will. 
dQ: „Front and face yellow, front with an opaque, black 
shallowly \/-shaped band in front of the red vertex, connected 
in the middle by a slender line with an inverted \/-shaped mark 
about the base of the antennae. Cheeks deep black, in front with 
agoldensheen. Antennae black, first joint, second and thirdjointnear 
their articulation below, yellowish red; third joint of style not 
elongate, second joint slender. Thorax opaque black; a golden 
pollinose spot at the inner side of each humerus; in front of the 
scutellum diffusely golden-pollinose; pleural stripe not sharply 
limited. Abdomen opaque black, slender; the third and following 
segments diffusely yellowish-pollinose above; third and fourth 
segments of female, third, fourth, and fifth of male with a opaque 
golden band posteriorly. Legs reddish-brown, the base of all the 
tibiae yellow; basal joints of the tarsi yellowish. Wings brown 
in front, nearly hyaline behind; the outer part of the discal cell 
hyaline, save for a streak in front of the fifth vein; a subhyaline 
space in the first posterior cell in front of the last section of the 
fourth vein. Length 10—11 mm. 
Mexico, Xucumanatlan in Guerrero.‘ 
14. Physocephala xanthops Will. 
dQ: „Vertex obscurely red; below the callosity a transverse 
opaque black band narrowly connected in the middle with a 
slender, inverted \/-shaped mark above the base of the antennae. 
Lower part of the front and the face sulphur-yellow; cheeks brown, 
with an oval yellow spot in the middle. Prevailing colour of the 
antennae red, first joint somewhat, second for its greater part, 
third above, black. Third joint of the style short, without bristly 
extremity, scarcely longer than the slender second joint. Thorax 
opaque black, thinly whitish pollinose, a silvery-or golden-pollinose 
spot at the inner side of each humerus; the white vertical pollinose 
pleural stripe not diffuse above. Abdomen opaque black; second 
segment distally, and the posterieur segments above, whitish 
pollinose; third, fourth and fifth segments each with a narrow 
opaque light yellow posterior margin. Legs reddish brown, the 
tibiae more distinctly red, their basal portion, and the basal 
joints of the tarsi yellow or yellowish. Wings brown in front, 
the distal portion of the discal cell, and a spot in front of the last 
section of the fourth vein hyaline. Length 1—1,1 cm. 
Mexico, Venta de Zopilote in Guerrero, Teapa in Tabasco.” 
