TABANID^ OF OHIO. 37 



Female: Facial callosity black ; dorsally, abdominal segments black 

 as follows: first with a spot beneath the scuteilum, second with ' two 

 narrow oblique spots, third and fourth each with four nearly square spots, 

 the others entirely black except the narrow yellow posterior margin ; ven- 

 trally, abdomen yellow basally, marked with black on apical half. 



Male: Abdominal spots on the second segment united anteriorly, 

 spots on third and fourth segments small. 



Habitat : Medina, Sandusky, Wauseon. 



The markings on the abdomen are somewhat variable, and 

 the male has a slight infuscation at the base of each of the basal 

 cells. The two sexes are so near alike that they are easily asso- 

 ciated. 



The separation of the apical spot from the cross-band dis- 

 tinguishes it from all species except hilaris, and fallax is noticea- 

 bly smaller than that species. 



The black marking beneath the scuteilum is single in fallax 

 and divided in hilaris. 



CHRYSOPS FLAViDUS Wiedemann. 



Length 7-10 mm. First two segments of antennae yellowish, not 

 noticeably thickened ; basal part of third segment yellowish with an 

 obscure brown band on its thickest part, apical half black; the thorax 

 has four grayish longitudinal stripes separated by brown intervals ; the 

 parts of the wing not occupied by brown are grayish hyaline and not 

 clear as in most species ; the hyaline triangle reaches forward to the 

 middle of the first submarginal cell and includes about half of the 

 second submarginal and parts of the first three posterior cells; the cross 

 band fills out the fourth posterior cell ; the apex of the anal and part of the 

 fifth posterior are infuscated; usually the apical half of the first basal 

 cell and two-thirds of the second basal are hyaline but some variation 

 is allowable; dorsally the abdomen is brownish, lighter on the first seg- 

 ment and sides of second, and segments two, three and four have a 

 prominent gray triangle in the middle of the posterior part preceded by 

 a dark area which usually takes the form of a geminate spot ; the anterior 

 margins of the last three segments are black or brown ; the dark markings 

 ■of the abdomen are somewhat variable. 



The male and female are alike, except in the single male I have 

 fully half of the second basal cell is brown. 



Habitat : Taken at Cincinnati, Ohio, by Charles Dury. 



Regarding the synonymy I am inclined to the belief that 

 flavidus, pallidus and canifrons refer to the species here consid- 

 ered as flavidus, for Wiedemann's type came from Florida, Bel- 

 lardi's from Mexico, and Walker's from Georgia. Besides, they 

 all mention the dark markings on the abdomen. 



CHRYSOPS FRiGiDus Ostcn Sacken. 



Length 6-8 mm. Facial callosities shining black with a stripe of 

 yellow pollen between them, palpi yellow; first basal cell of the wing 

 brown on basal three-fifths and at apex, second basal brown on basal 

 half and at extreme apex, cross band not quite reaching the posterior 



