6 
Psyche 
[March-June 
DESCRIPTIONS OF THREE NEW NEOTROPICAL 
SPECIES OF CHRYSOPS (DIPTERA, TABANHLE) 1 
By Joseph C. Bequaert 
Museum of Comparative Zoology, Cambridge, Mass. 
Chrysops zayasi, new species (Figs. 1-3) 
Female. — Medium-sized, of the group of C. incisa Mac- 
quart and closely related to C. frazari Williston. 
Frons about as wide as high, mostly grey pollinose; ocellar 
area moderately raised, extensive, denuded shiny black and nar- 
rowly connected medially with a shiny black upper margin of 
the callus; frontal callus low, yellowish-brown, separated from 
the eyes by narrow pollinose orbits. Fronto-clypeus shiny 
honey-yellow, except for the grey pollinose narrow inner orbits 
and upper half of cheeks; facial pits yellow; upper lateral areas 
(above the pits) moderately swollen, not conical. Antennae 
entirely black, sparsely black-haired, slender, slightly longer 
than fore femora; segment 1 about one and one-third times the 
length of 2 ; 3 slightly longer than 1 + 2 ; 1 and 2 cylindrical, 
scarcely swollen, but 1 slightly thicker than 2, particularly seen 
from above. Palpi honey-yellow. Thorax black; mesonotum 
with four greyish pollinose longitudinal stripes: one on each 
side, above the base of the wing, very wide, continuous; a 
median pair narrow, broadly interrupted before the scutellum, 
connected anteriorly with the lateral stripes. Scutellum mostly 
shiny brownish-yellow. Pleura with two broad, yellowish-grey 
pollinose longitudinal stripes, the upper one interrupted me- 
dially. Legs mostly pale yellowish-brown; trochanters, tips of 
femora and of tibiae, and tarsi more or less infuscated to black; 
coxae partly grey pollinose; tibiae not widened. Wings hyaline, 
with dark markings similar to those of C. incisa : apical spot 
well defined as a narrow, continuous stripe along costa, ending 
at apex of wing and filling in the entire marginal cell; cross- 
1 Published by a grant from the Museum of Comparative Zoology at Har- 
vard College. 
