1946] New Neotropical Species of Chrysops 7 
band covering entire 4th posterior (which is narrower at apex 
than usual) and basal third of 5th posterior cell, continued to 
the margin along the upper side of the anal cell (which is closed 
at the apex) ; no hyaline spot in first submarginal cell in holo- 
type and one paratype (the other paratype has small, drop-line 
hyaline spots in the distal extension of the cross-band in the 
first submarginal cell, in the discal cell, and in the apical spot at 
the tip of the first submarginal cell; this is no doubt an abnor- 
mal condition; in every other respect the specimen agrees with 
the holotype) ; cross-band abruptly extended in the first sub- 
marginal cell, but ending far from the fork of the third vein; 
basal cells hyaline except for extreme bases and apices. Hal- 
teres yellowish-brown, the knobs infuscated above. Abdomen 
black, with a dorsal pattern of yellowish, grey pollinose mark- 
ings similar to that of C. frazari , but the sides of 1st tergite 
extensively yellowish; median mark of tergite 2 either hour- 
glass-shaped or divided into two triangles; ventrally two broad, 
yellowish, grey pollinose stripes, fused anteriorly to cover most 
of sternites 1 and 2. 
Length (not including antennae), 7 to 7.5 mm.; of wing, 
8 mm. 
Cuba: Cienaga de Lanier, Isle of Pines, March 28, 1945 
(Fernando de Zayas Collector); holotype and 1 paratype at 
M.C.Z. (No. 27434) ; 1 paratype deposited at the United States 
National Museum. 
C. zayasi is very closely related to C. frazari of Hispaniola, a 
species as yet imperfectly known (see J. Bequaert, 1940, Rev. 
de Entomologia, XI, p. 282, fig. 1). At present it may be sepa- 
rated by the different shape and color of the antenna (in frazari 
segment 1 and 2 are more swollen and reddish-brown) and by 
the color of the frontal callus (black in frazari ). 
This interesting addition to the scant tabanid fauna of Cuba 
was received from Dr. S. C. Bruner, who kindly presented the 
holotype and one of the paratypes to the Museum of Compara- 
tive Zoology. 
Chrysops renjifoi, new species (Figs. 4-6) 
Female. — Small, related to C. latitibialis Krober and the 
species described below as C. weberi. 
Frons very slightly higher than wide (appearing as wide as 
high in exact front view, as drawn in Fig. 5), mostly grey pol- 
