1944 ] Further Studies of the Tabanidce 2 1 
Female: frons at least five times as high as greatest width, slightly narrowed 
below. Length, 9 to 12 mm. (Male unknown) T. jumatipennis. 
3. Female: frons less than three times as high as wide and nearly parallel-sided; 
frontal callus at least as wide as high and nearly as wide as frons. Lateral 
stripes decidedly step-like. Wing hyaline 4. 
Female: frons at least three times as high as wide (usually much higher) ; in 
doubtful cases narrowed below; frontal callus as high as wide or higher and 
narrower than frons. Lateral stripes usually regular. Fore coxae and most 
femora largely pale or yellowish 5. 
4. Fore coxae and most femora largely black. Scutellum black. Mid-dorsal stripe 
a slender even line. Female: frontal callus dark brown to black. Male: 
upper half of eye hairy, but with the facets only slightly larger than those 
of lower half (the line of demarkation between the two types not clearly 
defined). Length, 11 mm T. johannesi . 
Female: fore coxae and most femora pale; scutellum reddish; mid-dorsal 
stripe a series of contiguous triangles; frontal callus yellowish-brown. 
Length, 11 to 14 mm. (Male unknown) T. angustivitta. 
5. Grayish; abdominal stripes broad and quite even, covered with chalky-white 
hair. Wing hyaline. Female: frons nearly parallel-sided; frontal callus 
grownish, only slightly higher than wide. Male: upper half of eye hairy, 
but with the facets only slightly larger than those of lower half (the two 
areas not clearly defined). Length, 12 to 15 mm T. amplifrons. 
Grayish to yellowish-brown ; abdominal stripes covered with grayish-white 
or yellowish hair. Female: frons narrowed below; frontal callus usually 
decidedly higher than wide 6. 
6. Wing hyaline. Female: frons somewhat less than four times as high as great- 
est width; frontal callus large, yellowish-brown. Male: upper two-thirds 
of eye hairy and with the facets much larger than those of lower third. 
Length, 12 to 14 mm T. vittiger var. guatemalanus. 
Wing somewhat clouded, at least along the veins. Female: frons at least four 
times as high as greatest width ; frontal callus rather small, dark brown 
to black. Male: upper two-thirds of eye bare, but with the facets much 
larger than those of lower third. Length, 12 to 14 mm 
T. lineola var. carneus. 
29. Diachlorus scutellatus Macquart. 
Trinidad, without more definite locality, female (W. Urich). 
This insect was sent to the U. S. Nat. Mus. and determined by 
Dr. Alan Stone, who sent it to me for study. The species is 
known also from French Guiana, British Guiana and Brazil. 
30. Diachlorus curvipes (Fabricius). 
Nariva Swamp, female (R. C. Shannon). The species is 
known with certainty from Panama, Colombia (Muzo, Dept. 
Boyaca), British Guiana, French Guiana, Venezuela, and 
Brazil. Surcouf’s citation of “Uruguay” was an error for Para- 
guay; but the occurrence in Paraguay is doubtful. 
31. Acanthocera marginalis Walker. 
Diego Martin, female (D. J. Billes); Morne Bleu, 2,700 ft. 
female, biting man (E. McC. Callan); Talparo, female, biting 
man (E. McC. Callan). 
