Entomology of tlie Illinois Ri/ver. 235 



light brown elongate fleck. False feet shiuiug and 

 rather finely striated on each side. No projyctiug spine 

 posteriorly; only a narrow pale annulus on last seg- 

 ment, at base oi" breathing tube. 



T. Uneola Fabr. [Fig. 43-46.] 



The larva of this species closely resembles the young of 

 nigrescens, and was not separated from it at first. Exam- 

 ples were taken at stations C, T, and H on April 14, 15, and 

 4iO; and in Flag Lake April 27— as shown by specimens 

 preserved. We have also taken the larva April 8 and 

 June 15 and 24 in Sand Lake, Lake county, and in 

 ponds in Kane and Champaign counties. Three pupae 

 have been obtained on May 18 of different years. Ima- 

 gos were obtained from these May 27, 29, and June 6. 

 The tabanid pupae develop much more rapidly in hot 

 weather than in cold, and to this fact is probably due 

 the difference in time of emergence. Another pupa was 

 found at Matanzas Lake Aug. 24. 



Imagos were also collected in the vicinity of the 

 cabin boat at Station C May 17, June 13, July 14, and 

 Sept. 9. In our general collections they have been taken 

 April 23 at New Orleans, and in Illinois on fourteen occa- 

 sionsfrom June 2 to July 28, also Aug. 3 and 13 and Sept. 

 27. Whether there are one or two broods remains to 

 be determined. These imagos were from Lake, Cham- 

 paign, and Union counties, being obtained once at sugar, 

 once at an electric light, and several times found visiting 

 flowers. The species is a common one in central Illinois. 



Larva. — Length 20 mm., diameter 2.7 mm. Prothorax 

 with lateral shining areas about as long as the dorsal area, 

 striation about the same as that of the upper mesotho- 

 racic area, no noticeable central smooth spot, a small 

 one on lower margin posteriorly; remaining lateral 

 areas a little more finely and closely striate; dorsal 

 and ventral areas of thorax nearly smooth on disk, 

 with basal striae; those of abdomen with moderately 

 -close striae, more or less interrupted on disk; all areas 

 morp or less shining. 



