OF THE TABANID^ OF THE UNITED STATES. 439 



The identification can hardlj be called in doubt, although Say does not expressly men- 

 tion the triangle on the second segment. Wiedemann must have had an older specimen, as 

 he calls the antennae and the legs brown and not black. The words " Wurzel und Spitze 

 des dritten Gliedes guttgelb," contain some lapsus. Dr. Eedtenbacher kindly examined 

 Wiedemann's type in Vienna for me, and his answer to my inquiry satisfied me of the cor- 

 rectness of my identification. 



10. Tab anus trimaculatus. 



Tabanus trimaculatus Pal. Beanvois, Ins. Dipt. Tab. I, f. 5; Wiedemann, Auss. Zw., I, p. 137, 40 (repro- 

 duction of Palisot's description) ; ibid., p. 132, 33 (Wiedemann's own description, doubtfully identified with 

 Palisot's) ; Macquart, Dipt. Exot. I, 1, p. 142. 



Tabanus quinquelineatus Macquart, Hist. Nat. Dipt., I, p. 200, 11. 



Female. Palpi whitish yellow, clothed with minute black hairs ; flice white, with white 

 hairs ; front brownish gray, with a brown spot in the middle ; frontal callosity reddish 

 brown, seldom dark brown, somewhat longer than broad, with a more or less spindle-shaped 

 prolongation above. AntennJB black, sometimes a little reddish on the first joint ; upper 

 angle of the third joint sharp, projecting, but not drawn out in a point. Thorax brown, 

 with well marked white longitudinal lines, formed by short white hairs on a whitish ground 

 color ; scutellum clothed with a whitish pollen and pubescence, through which the brownish 

 ground color is visible. Pleuras white, with white hairs ; a stripe of black hairs between the 

 root of the wings and the humerus. Abdomen deep black or brown opaque ; on each of the 

 segments three-five a white triangle in the middle ; lateral margins of all segments white ; (in 

 some specimens the second segment has two veiy faint whitish dots in the middle, and at a 

 considerable distance from each other). Venter with a broad bi'own longitudinal stripe in 

 the middle ; its sides whitish. Legs : femora black or brown, clothed with a white pubes- 

 cence ; tibia; yellowish white, black at tip ; tarsi black. Wings subhyaline, slightly tinged 

 with pale brownish ; stigma brown ; faint brownish clouds on the crossveins and on the 

 bifurcation of the third vein ; first posterior cell slightly coarctate at the end, in some spec- 

 imens more than in others. Length, 17-19 mm. 



Male. Head subhemispherical, with a distinct demarcation between the large and small 

 facets ; in the dry sj)ecimen the region occupied by the large fivcets is whitish, with a broad 

 brown crossband over both eyes ; (in this resjiect very like the male of T. coffeatus). 

 Length, 17 mm. 



Hub. District of Columbia, Delaware, Pennsylvania, Mississippi, Illinois, Georgia (Ent. 

 Soc. Phil.); Carolina (Macq.). Ten females and one male. 



The eyes of the female show two parallel, rather narrow green bands, on purple ground ; 

 the interval between them is twice as broad as the bands themselves, and almost equally 

 broad at both ends ; (colors revived on moist sand). 



Except in the coloring of abdomen and legs, this species has a most striking resemblance 

 to T. molesiiis ; (hence Wiedemann, 1. c, compares both species). A very characteristic 

 mark of the species (besides the three triangles or segments three-five), and the absence of 

 them on the fii'st and second segments, is the broad brown longitudinal stripe on the venter. 

 The scutellum is less white here than in T. molestus, and does not much diifer in coloring 

 from the rest of the thorax. The average length of T. trimaculatus is smaller than that 

 of T. molestus. 



