Dec., 1904.] 
Tabanidae. 
22 1 
marginal, with the exception that there may be a trace of hyaline 
across the second vein, the broad apex of first submarginal, and 
reaches into the second submarginal. The cross-band occupies 
al)Out half of the first .submarginal, first, third and fifth posterior, 
one-fourth of second posterior, all of discal and fourth posterior 
and small apical parts of anal, and first and second basal; one- 
half or more of second basal, all of axillary and anal, except apex 
of latter are hvaline. Abdomen black and yellow, black as fol- 
lows: first segment beneath the scutellum, second with two tri- 
angular spots united on anterior margin of the segment, but not 
reaching posterior, third and fourth segments each with four 
spots longitudinally separated by yellow, fifth and following seg- 
ments except posterior margins. In some cases the fifth segment 
is colored like the previous one. Venter with a rather wide 
median stripe and a narrow lateral one. 
Male, 8 millimeters, some specimens slightly smaller and some 
slightly larger. Head and its parts differing from those of the 
female only in sexual characteristics. Thorax not showing 
stripes as plainly, but otherwise this and the legs are as in the 
other sex. Wings with a spot in each basal cell equal to about 
one-fourth the length of its res])ective cell, and a fuscous patch in 
the base of the anal cell, otherwise like wings of the female. 
Abdomen, first segment black with the exception of a small yel- 
low area on each external lateral margin, second segment yellow 
on sides and on posterior margin, the black is extended and 
reaches the anterior margin, but posteriorlv is divided bv ante- 
rior {projections from the yellow posterior margin, so that it may 
be said to send backward four projections, the narrow lateral ones 
of which may be cut off by yellow and exist as separate spots, the 
third and fourth segments are like the second, but the lateral 
black spurs are not cut off, the fifth segment suggests the one 
before it, but the yellow is more or less obscure, excepting a nar- 
row posterior margin, sixth segment black. Venter as in female. 
A number of sjiecimens from dift'erent collectors, taken in 
southern California. The species is named for D. W. Coquillett, 
who has produced a large number of valuable contributions to 
Dipterological literature and to entomology in general, and who 
collected several of the specimens near Los Angeles. 
The species is nearest related to pachycera, but its larger size, 
different abdominal markings and a more extended coloration on 
the basal part of the second basal and anal cells are distinctive 
in both sexes. 
Chrysops discallis Williston. This distinct species has some- 
what the appearance of fulvaster, but does not have the enlarged 
first antennal segment. It is rather large in size and may be 
known by the prominent hyaline space in the disacl cell of the 
wing. 
