234 Illinois State Laboratory of Natural History. 



T. sulcifrons Macq. 



Two males, one from the Union county bottoms, the 

 other from Urbana, not in the same day's collection with 

 any female Tabani, Aug. 1 and 11, are clearly of this spe- 

 cies according to Osten-Sacken's description. The^'have a 

 slightly different aspect from the two preceding species, 

 but show close resemblances. Possibly some females of 

 this species are included among those of T. exul. The char- 

 acters given by Osten-Saeken for their separation do not 

 seem to me very satisfactory. 



This and the two preceding species seem to appear 

 quite late in the season. 



T. trimaculatus Pal. Beau v. 



One female was collected about May 23 at Station C. 

 We have taken this species also at Pekin f Tazewell Co.) 

 and Urbana July 19 and Aug, 15. 



Tabanv-s sp. {a). 



My two examples of this peculiar species are from very 

 diverse situations. One was taken under bark in woods 

 near Urbana April 6; the other, from a prairie ditch in 

 Kane county which was swollen by a heavy rain. 



Larva. — Length 19 mm., diameter 2.5 mm. Last anten- 

 nal joint short and very slender, epistoma not sulcate an- 

 teriorly, but with an elongate puncture. Whitish, lateral 

 pubescent stripes wanting, annuli much reduced and pale 

 except upon false feet. Prothorax shining, with anterior 

 opaque annulus; lateral areas as long as the dorsal, 

 their upper and lower thirds rather coarsely striate, 

 middle third smooth, with several punctures; ventral 

 area smooth, middle groove with three strife, dorsal area 

 nearly smoo'h Striae of upper lateral spaces of meso- 

 and metathorax and of dorsal and ventral areas of 

 abdomen moderately coarse; those of lateral areas of ab- 

 domen somewhat finer; dorsal and ventral areas of meso- 

 thorax with a few striae ; of metathorax rather sparsely 

 striate. All areas more or less shining. On the anterior 

 side of each dorsal false foot, at its outer end, an opaque 



