316 ILLINOIS ACADEMY OF SCIENCE 



the three intermediate teeth have the margins projecting 

 as thin, pale wings. Hypopharynx (fig. 2) formed as in 

 this tribe, a roughly circular chitinized collar provided 

 with a cro^\Ti of strong teeth that are curved strongly out- 

 ward. Antemiae (fig. 4) two-segmented, the last seg- 

 ment rather stout, cylindrical, slightly curved; the api- 

 cal papilla is small but high, subhyaline. Mandibles 

 (fig. 3) broad and flattened with a small dorsal tooth, and 

 a row of five teeth along the ventral cutting edge, the 

 outermost exceeding the apical point in size, the teeth 

 thense decreasing in size to the basal one which is di- 

 rected strongly basad. Maxillae of the usual general- 

 ized structure of this tribe, the inner and outer lobes 

 subequal in size, densely hairy, the cardines large. 



Pupa. — Length (including breathing-horns), 8-9 mm.; 

 breathing-horns alone, 1.2-1.3 mm. 

 Width, dextro-sinistral, .85-.9 mm. 

 Depth, dorso-ventral, 1-1.05 mm. 



Pronotal breathing horns grayish subhyaline. Head, 

 thorax and sheaths of the appendages dark brown, be- 

 coming darker with age. Abdomen white or whitish, the 

 chitinized terminal hooks and the transverse rows of 

 spicules on the segments brown. 



Cephalic crest small, indistinctly bilobed, distinctly set 

 off from the antennal bases by deep grooves. Front long 

 and parallel. Eostral sheath (fig. 12) very long and 

 slender, subtended on either side by the sheaths of the 

 paraglossae (fig. 12, Pa.) ; the latter project considerably 

 beyond the tip of the former, extending to almost oppo- 

 site the wing-tip; the rather acute apex of the rostrum 

 ends just before midlength of the metatarsal sheaths. 

 Margins of the cheeks prominent, flattened, as in this 

 sub-tribe, overlying the knee-joint of the fore-legs. An- 

 tennal sheaths (fig. 8, Ant) short, ending slightly beyond 

 the base of the wing-pad. 



Pronotal breathing-horns (fig. 9) very long and promi- 

 nent; viewed from the side (fig. 8) they are broadest be- 

 fore midlength where there is a distinct bulge on the 

 anterior margin nearest the eye, thense tapering to the 



