21 



data for more than a sing-le g-eneration of this species in our lati- 

 tude. 



Description of Larva. — Head pale yellowish brown, darkened 

 toward mouth parts, mandibles black, other mouth parts brown, 

 body white except cervical shield, which is slig-htly embrowned, 

 paler than head ; spiracles pale brown, first very larg-e, remaining" 

 eight small but gradually larg-er from before backward, the last, 

 however, about twice as wide as preceding- ; sutural grooves very 

 distinct below, where they are cut at the sides by about five or 

 six long-itudinal g-rooves, becoming- fainter downwards. Several 

 long- soft hairs on head and inferior thoracic reg-ion, and some 

 shorter, stouter ones at tip of abdomen ; elsewhere, body nearly or 

 quite naked. Form of body short aud thick, g-radually swollen 

 posteriorly, seg-ments 7-9 being- thickest ; anal seg-ment with quad- 

 rate excavation above, between the last two spiracles. Tubercles 

 beneath thorax broad, low, shining-, not especially hairy. 



Clypeus membranous ; labrum obtusely angled in front, with 

 two spines on the surface at about middle of antero-posterior 

 diameter, about equally distant from each other and from the mar- 

 gins ; two similar spines at front ang-les, and two other marg-inal 

 ones a short distance within. Two of the inferior spines near the 

 middle of the marg-in are furcate. Labium largely membranous, 

 palpi two-jointed, basal segment a little long-er than wide, terminal 

 one slightly oval, about half as wide as the other. Ligula membra- 

 nous, densely hairy in front, basal part of maxilhe bisinuate without, 

 bearing- two long- hairs, one near palpus, the other at basal third ; 

 palpus two-jointed, basal joint broader than long-, second small, 

 ovate, half as wide as preceding- ; lobe of maxillie semi-oval, with 

 about ten dag-g-er-like and furcate spines on terminal edg-e. Man- 

 dibles triangular, almost equilateral, acute and slightly hooked at 

 tip, biting edge with a single triangular median tooth. 



Length of larva, 15 mm. ; greatest depth, 5 mm. ; greatest 

 width, 5 mm. 



Additional Species. 



Sphenophoriis scoparitis Horn, found by us but rarely on corn 

 and grass, has occurred in our collections from June 16 to July 7, 

 and from northern to central Illinois. 



Sphenophonis sculpti/is Uhler, described as zccb in 1867 because 

 of its injuries to corn, has been surprisingly rare in our collections, 

 and has nerer been taken by us from the corn plant in Illinois. 

 June 7, 1884, specimens were found on blades and heads of timothy 

 at Du Quoin, in southern Illinois, and July 9, 1888, a single one 



