4 PAPERS OX CEREAL AXD FORAGE INSECTS. 



Mandible (fig. 3, d) short, very broad at base, almost as broad as long, tapering 

 abruptly to a sharp point; outer face convex and smooth, with a small seta near 

 center; ferruginous at base and black at extremity, strongly curved; inner face 

 concave, with two small notches midway of superior margin and one small notch near 

 extremity of inferior margin. 



Maxillae (fig. 3, c) inserted far to the rear, large, fleshy, curving considerably, thus 

 inclosing the labium: extending considerably beyond tips of mandibles: distal 

 extremity bearing the two-jointed palpus and the lacinia. Each maxilla bears a 

 number of setae, one large and two small ones occurring on outer face, a large one at 

 outer and one at inner angle of base of palpus, and two small ones and one large one 

 caudad of these. The lacinia is a brushlike or^an bearing a fringe of stout bristles. 

 Maxillary palpi (fig. 3, c) two-jointed; first joint slightly obconical, about as thick 

 as long, bearing several setae on the outer face: the second joint is a slightly truncated 

 cone, and much smaller than the first joint, and bears a number of minute setae at 

 the apex. 



The labium (fig. 3, c) is a very simple organ inserted between bases of maxilla?, 

 fleshy, rectangular; distal extremity sharply rounded and fringed with minute seta?, 

 with two larger seta? at tip; four seta? forming a semicircle near center, the two in 

 the center much the largest; a large seta at inner angle of base of each palpus. Labial 

 palpi (fig. 3, c) very minute, two-jointed; first joint cylindrical: second joint almost 

 cylindrical but much smaller than the first and slightly rounded at tip, bearing 

 several minute seta?. 



Prothorax as large as the two following segments combined; viewed from side 

 triangular in form; not wrinkled or folded but finely striate; dorsally the posterior 

 margin extends back for a considerable distance into the mesothorax. The rneso- 

 thorax and metathorax lie at quite an angle with the abdominal segments; posterior 

 margin of dorsum of mesothorax extending back to center of metathorax. Meta- 

 thorax about same width as mesothorax, except on dorsum, where it is somewhat 

 narrower. 



Legs fleshy, cone-shaped, four-jointed; first joint very large and more like a pro- 

 jection of the thorax than a joint of the leg: second joint obconical, very short, and 

 very much smaller than the first: third joint cylindrical, short, and very small; 

 fourth joint the smallest of all, obconical, rounded at apex, and bearing three spines 

 at tip ; a whorl of spines at each joint on outer face : segments very imperfectly defined 

 in most cases. 



Abdomen composed of nine segments, all of which are broader than the mesothorax 

 or metathorax. First six segments bearing on their dorsal surface two round, fleshy, 

 somewhat retractile elevations or tubercles (M. Perris, in his Larves des Coleopteres, 

 calls them "'ampoule ambulatoire. "" ) These tubercles are almost circular in form 

 and the apex is crumpled and folded and bears several small seta?. Dorsum of the 

 seventh segment with a slight transverse ridge bearing a number of recurved bristles; 

 eighth segment bearing a number of bristles, which are more numerous near posterior 

 margin, all directed backward. First eight segments with a large fold extending 

 their full length on each lateral face, most prominent near center of segments, at which 

 points there are a number of bristles directed slightly to the rear. Xinth segment 

 somewhat cone-shaped, densely covered with stout bristles, ending posteriorly in a 

 two-pointed, chitinous projection; just below this, dorsally, are two chitinous spurs 

 or tubercles. 



Stigmata: Xine pairs of stigmata, one pair in mesothoracic region just above and 

 slightly in front of insertion of legs and a pair to each of the first eight abdominal 

 segments, very near the anterior margin and just above the lateral fold. They are 

 circular in form, the thoracic being slightly the larger. 



