50 
45. 
MISC, PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
Key to Nearctic Males of Tabanus—Continued 
Hair of pollen and pleura grayish; areas of large and small facets 
of eye rather, distinctly differentiated) ae 
Sublateral abdominal spots large, yellow; hair of thoracic dorsum 
Sublateral abdominal spots smaller, rarely reaching anterior 
margin of tergites, pale brownish gray; hair of mesonotum 
Annulate portion of third antennal segment black 
sublongus, new species, p. 74. 
46. (44) Third antennal segment uniformly orange brown; (southeastern 
47. 
48. 
49, (47) 
50. (33) 
51. 
52. 
5d. 
D4, (51) 
55. (1) 
56. 
57. 
58. (56) 
59. 
60. 
61. (59) 
part of the United States) __________ gracilis Wiedemann, p. 68. 
Annulate portion of third antennal segment distinctly darker than 
basal portion, or whole segment dark______________-_____ 
Third antennal segment slender; first antennal segment not en- 
larged: (no spot at. furcation) =~ 22. oe tie eee 
Third antennal segment not slender; first segment somewhat 
TNE ATS Ca Fo ee ee ee ee ee ee 
Third antennal segment extremely elongate, the basal portion 
orange, annulate portion black________ sackeni Fairchild, p. 72. 
Third antennal segment moderately elongate, black except at 
extreme bas@s 22 5 ee vivax Osten Sacken, p. 67. 
Blackish, the antenna entirely black; no spot at furcation; palpus 
VERY SOUS: see oo, et See re er pruinosus Bigot, p. 65. 
Brown, the antenna largely orange; a faint spot at furcation ; palpus 
Pather Slew Gite x2 cee ea ae eke AE abactor Philip, p. 69. 
A distinct spot at furcation-_______________ acutus (Bigot), p. 117. 
No. Spotyat Lurcation=3 Sos Be ee ea he 
Annulate portion of third antennal segment as long as basal por- 
tion; costal cell colored, sometimes faintly; prescutal lobe 
usually concolorous with rest of mesonotum____________-______ 
Annulate portion of third antennal segment shorter than basal 
portion; costal cell hyaline; prescutal lobe usually paler than 
Test Of MESOnOUUMs ais ee ee oe St 
Palpus, pleura, and costal cell strongly yellow 
vicarius Walker, p. 117. 
Palpus white, pleura grayish, costal cell variable____________-_____ 
Costal cell deep brown; small species, with dark abdomen 
mularis Stone, p. 121. 
Costal cell rather pale yellowish; abdomen broadly yellowish 
brown laterally 2222250. 22025 — nigrovittatus Maequart, p. 120. 
Secutellum entirely black in ground color__lineola Fabricius, p. 122. 
Apex of scutellum reddish___lineola var. scutellaris Walker, p. 123. 
Hair on mid line between eyes__-_-____ oklahomensis Stone, p. 140. 
No ,yhair, between :@y eS. 3 a Ss oh ee 
Abdomen with a yellowish-gray, parallel-sided, median stripe_-_-—- 
Abdomen “not. 80 :colored = 24 <= 9s: Bo sw ee ee I 
Palpus small; hind femur entirely gray; hair of mesonotum 
strongly wellow= 2-2. 28 262 bishoppi Stone, p. 53. 
Palpus moderate in size; at least apical third of hind femur red- 
dish; hair of mesonotum nearly white__truquii Bellardi, p. 123. 
Vertex; pollinose.and Wairy i) 2 20. so ee ee 
Vertex usually denuded of pollen; hair confined to posterior haif, 
or, if hair on anterior half, the posterior hair very long and 
CURVEO {forwards 4.5 8 eee ele Oe ee es Be 
Furcation and cross veins margined with brown__--______------_- 
Furcation and cross veins not margined with brown_____---_~__-~- 
Eye densely pilose; areas of large and small facets not sharply 
differentiated; rather large species 
reinwardtii Wiedemann, p. 82. 
Eye sparsely pilose; areas of large and small facets sharply differ- 
entiated ; smaller species_______________ monoensis Hine, p. 81. 
First antennal segment considerably swollen above___--------~---- 
First antennal segment not very swollen above___-__--------~----- 
44 
45 
46 
AT 
48 
49 
OL 
52 
5d 
67 
61 
