Entomology of the Illinois RvD&r. 215 



outer pair nearly twice as long as inner pair; a similar 

 tooth anterior to each of the outer two, near the an- 

 terior margin of the segment; a blackish spot at the 

 base of each upper tooth, and one below each stigmatal 

 plate; anal prominence with four blunt tubercles about 

 the anal opening. 



Larva {I). [Fig. 35, 36.] 



One example was found May 16, in the wet sand of 

 the shore at Station C, during the interval between the 

 larval broods of Tipula eluta. The last segment is 

 extremely different from that of eluta. 



Larva [Fig. 35, 36].— Length 30 mm., diameter 3.5 

 mm. Head with larger pale areas, transverse line very 

 broad, otherwise about as in eluta. 



Body pale dirty yellowish, surface scarcely pubescent, 

 evenly covered with minute brown points or very short 

 hairs grouped by twos and threes in transverse arrange- 

 ment, confused on sides of body. Last two segments very 

 indistinctly separated, noticeably pubescent and darker 

 above. Transversed impressed lines of anterior divisions 

 well marked, three in number; posterior divisions slightly 

 swollen, with two distant indistinct lines; first four seg- 

 ments and posterior divisions bearing four brown setae 

 with thicker blackish bases in a straight transverse row 

 above, inner setae less distinct, and a curved row- of close- 

 set pairs of long setae below; on each double segment 

 two lateral setae, one on each division, thoracic seg- 

 ments with two lateral setae one above the other, or only 

 one. Prothorax with an anterior elevation, beariijo: a 

 short transverse darker ridge each side in a chitinous 

 area. 



Last segment [Fig. 36] with concave transverse stig- 

 matal field, and overhanging it above four very long, 

 slender, tapering, nearly equal teeth in almost a straight 

 line; below it two short rather distant teeth, each with 

 an apical seta; all similar to outer surface in color and 

 vestiture. Stigmatal plates nearly black, three deep-set 



