TABANIDAS OF OHIO. 37 
Female: Facial callosity black; dorsally, abdominal segments black 
as follows: first with a spot beneath the scuteilum, second with two 
narrow oblique spots, third and fourth each with four nearly square spots, 
the others entirely black except the narrow yellow posterior margin; ven- 
trally, abdomen yellow basally, marked with black on apical half. 
Male: Abdominal spots on the second segment united anteriorly, 
spots on third and fourth segments small. 
Habitat: Medina, Sandusky, Wauseon. 
The markings on the abdomen are somewhat variable, and 
the male has a slight infuscation at the base of each of the basal 
cells. The two sexes are so near alike that they are easily asso- 
ciated. 
The separation of the apical spot from the cross-band dis- 
tinguishes it from all species except /ilaris, and fallax is noticea- 
bly smaller than that species. 
The black marking beneath the scutellum is single in fallax 
and divided in hilaris. 
CHRYSOPS FLAVIDUS Wiedemann. 
Length 7-10 mm. First two segments of antennae yellowish, not 
noticeably thickened; basal part of third segment yellowish with an 
obscure brown band on its thickest part, apical half black; the thorax 
has four grayish longitudinal stripes separated by brown intervals; the 
parts of the wing not occupied by brown are grayish hyaline and not 
clear as in most species; the hyaline triangle reaches forward to the 
middle of the first submarginal cell and includes about half of the 
second submarginal and parts of the first three posterior cells; the cross 
band fills out the fourth posterior cell; the apex of the anal and part of the 
fifth posterior are infuscated; usually the apical half of the first basal 
cell and two-thirds of the second basal are hyaline but some variation 
is allowable; dorsally the abdomen is brownish, lighter on the first seg- 
ment and sides of second, and segments two, three and four have a 
prominent gray triangle in the middle of the posterior part preceded by 
a dark area which usually takes the form of a geminate spot; the anterior 
margins of the last three segments are black or brown; the dark markings 
of the abdomen are somewhat variable. 
The male and female are alike, except in the single male I have 
fully half of the second basal cell is brown. 
Habitat: Taken at Cincinnati, Ohio, by Charles Dury. 
Regarding the synonymy I am inclined to the belief that 
flavidus, pallidus and camifrons refer to the species here consid- 
ered as flavidus, for Wiedemann’s type came from Florida, Bel- 
lardi’s from Mexico, and Walker’s from Georgia. Besides, they 
all mention the dark markings on the abdomen. 
CHRYSOPS FRIGIDUS Osten Sacken. 
Length 6-8 mm. Facial callosities shining black with a stripe of 
yellow pollen between them, palpi yellow; first basal cell of the wing 
brown on basal three-fifths and at apex, second basal brown on basal 
half and at extreme apex, cross band not quite reaching the posterior 
