214 Illinois State Laboratory of Natural History. 



brown, varied with blackish. Respiratory tubes with a 

 blackish sulcus dorsally. Mesonotum with rounded dis- 

 cal tubercles, and more pointed humeral ones behind each 

 respiratory tube; transverse suture deepl}' impressed 

 between the humeral tubercles and the tubes ; wing-pads 

 dark, paler medially, reaching apex of second segment; 

 legs blackish, usually attaining apex of third segment ; 

 middle tarsi a little shorter than the others. 



Each abdominal segment or half segment with three^ 

 blackish dots on each side above and below, in a row 

 directed obliquely inward and toward the nearest true 

 suture, variably distinct, lateral margin bearing a small 

 tooth on each anterior, and a minute one on each poste- 

 rior, division, posterior divisions above and below^ with a 

 transverse row of eight or ten short spinous teeth; be- 

 neath, a pair also in front of these, indistinct anteriorly. 



Last two segments closely connate, bearing anteriorly 

 larger spinous teeth, four ventral in a transverse row, 

 two lateral, sometimes blunt, and six dorsal, arranged 

 like the fleshy teeth of the larva, anterior pair approx- 

 imate and smaller, terminal cone of female scarcely 

 longer than the pair of teeth just above it; male with 

 corresponding area strongh^ protuberant, median line 

 impressed, a pair of sharp lateral teeth, and a pair of 

 obtuse tubercles above and below these. 



Larva {a). 



One example was taken Ma3'^ 18 in bottom-land earth 

 on the bank of Spoon River. It is probably young. 



Larva. — Length 16 mm., diameter 1.5 mm.; gray- 

 ish, covered with microscopic short dark brown pubes- 

 cence denser on thorax and last segments, in transverse 

 arrangement; folds very distinct, each slightly trans- 

 versely carinate and crested with darker pubescence, four 

 folds on anterior divisions ; each segment with the usual 

 four setae, prothorax with several setae. Last segment 

 with lower stigmatal teeth very small, triangularly black 

 on upper surface; upper teeth slender, pointed, whitish,. 



