52^ OHIO ST ATK ACADEMY OP' SCIENCE. 



Habitat: Common all over Ohio. 



This and costalis are near together iii size, but the hyaline 

 costal cell arid gray striped thorax distinguish lineola. It is an 

 annoying pest during the first part of the summer. 



TABANus LONGUS Ostcn Sackcu. ' i 



Length 14-15 mm. General color brownish, form somewhat elon- 

 gate; palpi white with short hairs, part of which appear black ; antennae 

 reddish, third segment black on apical part; thorax brownish with faint 

 grayish stripes, wings hyaline, legs brownish, tibiae especially the last 

 four segments darker ; abdomen above brown with narrow, gray hind 

 borders to the segments ; a row of faint elongate spots on the middorsal 

 line, these form a continuous row and therefore take on the appearance 

 of a stripe, each of the first five or six segments of the abdomen have 

 on either side a small somewhat oblique spot which does not touch 

 either margin. 



Female: Front slightly wider above, clothed with grayish yellow 

 pollen; frontal callosity nearly square, dark brown, and either united 

 or separated from a shining spot which lies above it and which appears 

 to be the upper part of the linear prolongation seen in many species. 



Male : Like the female except in sexual characteristics. 



Habitat : Medina, Ohio, where it is common and often ob- 

 served on horses. 



TABANUS Nivosus Ostcn Sackcn. 



Length 12-14 mm. Palpi pale yellow, antennae black, five narrow 

 gray stripes on the anterior part of the thorax, these are obsolete behind, 

 wings hyaline with brown veins ; legs black, tibiae more or less reddish.;; 

 abdominal segments above with very narrow gray hind borders ^yhich 

 expand into small gray triangles in the middle, prominent gray markings 

 on the sides of the segments, these markings get smaller gradually from 

 before backwards, and outwardly from them on each side is a row of 

 black spots which vary in size in different specimens. 



Female: Sides of the front parallel, frontal callosity brown, nearly 

 as wid6' as the front, arid above with a linear prolongation which reaches 

 half way to the vertex. ' ■..'":'-' '■ ■<;.''. 



Male : The two sexes are easily associated but the male usiially.' 

 has most gray on the abdomen. 



Habitat : Sandusky, where it is cbmmon. 

 r : This species resembles "t'iVaa" somewhat, but the pale yellow 

 palpi in both sexes, the pa'r'illel sides to the front in the femkle' 

 and the lack of prominent gray stripes on the thorax are chaii-| 

 acteristic of nivosus. ■It appears to be partial to stagnant wateir, 

 while viva.v breeds in swift flowing streams. It is one of'^the 

 Ohio species which rekdily attack's riian, and is "somewhat of an 

 annoyance at the bathing beach, following out over the water f^^^j. 

 far as one is pleased to go. / - ., • n 



