52 
72. (76) 
82. (79) 
83. (74) 
84, 
85. (71) 
86. 
87. 
88. (85) 
89. 
90. 
91. 
92. 
93. 
94. (90 
— 
95. 
96. 
97. 
98. (96) 
MISC. PUBLICATION 305, U. 8. DEPT. OF AGRICULTURE 
Key to Nearctic Males of Tabanus—Continued 
Secondysternite-entirely.orange. 2222 ee ee ee ee 
Second sternite orange, with a black median spot_________________ 
Preseutal lobe: black <- tt. -citae eh a Ee ee 
Prescutal lobe: orange__2__2{=-_-____= = affinis Kirby, p. 137. 
Orange on dorsum of abdomen not extending beyond tergite 3 
rhombicus var. rupestris McDunnough, p. 154. 
Orange extending onto tergite 4_____ atrobasis McDunnough, p. 159. 
More than 13 mm long; third antennal segment with dorsal exci- 
sion rather deep___—__- ee gracilipalpis Hine, p. 182. 
Less than 12 mm long; third antennal segment with dorsal exci- 
Sion: very. shallow. 2... = ee minusculus Hine, p. 145. 
Venter with black hair rather sparse, and, at least sublaterally, a 
considerable amount of yellowish hair-_— 222-20 = 4 
Venter with only black hair 
sonomensis var. phaenops Osten Sacken, p. 134. 
Second sternite with a large black spot medianly; second palpal 
segment stout, but apex not acute 
sonomensis Osten Sacken, p. 1838. 
Second sternite with scarcely any black medianly; second palpal 
segment stout, with apex acute 
haemaphorus MceDunnough, p. 1387. 
Abdomen with transverse bands; little or no indication of median 
Or Sublaterallh Spots a one 
Abdomen entirely dark or with distinct median or sublateral spots 
OY DOH. 2) 22"— 5 So 25s. BO lo eR ee ee 
Hind tibia dark reddish brown to black, with dark hair 
sexfasciatus Hine, p. 141. 
Hind tibia reddish yellow or yellow, with concolorous hair_____-_~ 
Abdominal bands broad, formed by yellow hair on a broad border 
of yellow pollen; prescutal lobe reddish__zonalis Kirby, p. 142. 
Abdominal bands consisting of a narrow fringe of pale yellow 
hair; prescutal lobe black_________ aequetinctus Becker, p. 148. 
Abdomen black, dull reddish laterally, with a median row of con- 
spicuous white triangles and no sublateral spots 
trispilus Wiedemann, p. 149. 
Abdomen, not; ‘So: Colored 222228: > set ae ee 
Fureation with a distinct brown spot__illotus Osten Sacken, p. 150. 
Fureation, without a distinct brown -Spot...--2--2--22_=_+-22 
EPresettal: lobe:: black anee Ae. 2220.9 Oe crete eee Dee ee 
brescutal lobe Orane@ eo. 25k es a ee, ee 
Femora brown... -.---~- =.= microcephalus Osten Sacken, p. 156. 
HMemora, black io. ie ce 8 ore epee ee i ee ee 
Second palpal segment stout, distinctly larger than first-_-_-__-__--- 
Second palpal segment small, subequal to first 
astutus Osten Sacken, p. 146. 
Sublateral abdominal spot on tergite 2 indistinct or absent; hair of 
clypeus and genae entirely black 
laniferus MeDunnough, p. 151. 
Sublateral abdominal spot on tergite 2 distinct; hair of clypeus and 
lower genae white____________ rhombicus Osten Sacken, p. 153. 
Hair of genae and pleura entirely white_fretus, new species, p. 154. 
Hair of genae and pleura not entirely white__-____-__--_-_---_----_-_- 
Frontal triangle denuded______________ melanorhinus Bigot, p. 156. 
Krontal: triangle; pollinose:. 22 et etek Ae ee ee oe 
‘A Stumpvat bases Of aVCln,, Riss 52 ee ee ee ee 
No stump rat DaseiOr vieding Rs te ee a ee 
MG Ona HDLa Ces ie ee re hes hirtulus (Bigot), p. 159. 
Femora yellow brown____----------------- liorhinus Philip, p. 155. 
Palpus rather stout, pale yellow_____--__- opacus Coquillett, p. 160. 
Palpus slender, orange brown__----------~- typhus Whitney, p. 148. 
86 
88 
87 
The following species are not included in the key to the males, 
either because this sex is unknown or because it is not well enough 
described to permit inclusion in the key: abdoméinalis, aurilimbus, 
