Dec, 1904.] Tabanidae. 233 



12. "White triangle on the second abdominal segment of the same 



size as on the third and fovxrth segments. Length about 1.3 

 millimeters _ c off cat us 



White triangle on the second abdominal segment much smaller 

 than those on the third and fourth segments. Length about 

 15 millimeters hyalinipennis 



13. Palpi clear black, general color of the whole body black 14 

 Palpi yellowish 15 



14. Costal cell dark brown procyon 

 Costal cell hyaline sequax 



15. A single narrow transverse brown band across the eye, no 



ocelligerous tubercle insuetus 



No such band across the eye, ocelligerous tubercle usuallj' 

 present 1 6 



16. Whole body shining black, if there are gray spots on the abdo- 



men there is no red ground color beneath them. Ocelligerous 

 tubercle denuded oshurm 



Whole body not black, or if so the subcallus not denuded; some- 

 times black with red ground color beneath the gray abdominal 

 spots 17 



17. Each abdominal segment black with a wide irregular gray border, 



wings dilute brownish zonalis 



Abdomen not so marked, wings hyaline or nearly hyaline 18 



18. Abdomen with a wide middorsal brown stripe and on either side 



of it a gray stripe of about equal width. dodget 



Abdoinen not so colored 19 



19. Abdomen largely black with hree rows of white spots, often 



with red ground color beneath the lateral spots 20 



Abdomen broadly red on the sides; this color not usually in the 

 form of spots 30 



20. Antennae black, or at most with a trace of reddish at the base 



of the third segment 21 



Antenna" largely red 26 



21. Wing with distinct fuscous on the margins of the cross- veins and 



on the furcation of the third vein. 22 



Wing with at most only a trace of fviscous on the margins of the 

 cross- veins and furcation of the third vein 24 



22. Subcallus not denuded in the female illohis 

 Subcallus denuded in the female 23 



23. Venter of the abdomen largely red centron 

 Venter of the abdomen black, covered with gray pollen rhombictts 



24. Wings reddish hyaline, lateral abdominal spots usually 



rounded septcntrionalis 



Wings clear hyaline, lateral abdominal spots angular and 

 oblique 25 



25. Base of the anterior branch of the third vein with a stump opaciis 

 Base of the anterior branch of the third vein without a 



stump itciTsivus 



26. Basal part of the third segment of the antenna fully as wide as 



long laticorms 



Basal part of the third segment of the antenna longer than wide 27 



27. No red beneath the lateral gray abdominal spots gilamis 

 With red beneath the lateral gray abdominal spots _ 28 



28. Head distinctly wider than the thorax laticeps 

 Head not noticeably widened 29 



29. Base of the anterior branch of the third vein with a stump jrenchii 

 Base of the anterior branch of the third vein without a 



stump susurrus 



