BROAD-NOSED GRAIN WEEVIL. 9 



area surrounding the mandibular foramen. Mandibles stout, triangular, with the 

 apex produced into an acute apical tooth. Inner edge toward apex provided with a 

 subapical tooth and a small medial tooth, no molar structure. Dorsal area of each 

 mandible armed with a pair of stout bristles set close together. Eye represented by a 

 well-defined black spot beneath the exoskeleton. Clypeus broad at base, sides nar- 

 rowing towards apical angles; distinctly broader but not as long as labrum. Epistomal 

 margin provided with two fine hairs on each side. Labrum about as broad as long, 

 rounded in front, provided with three pairs of large setae and five pairs of short, thick- 

 ened, marginal setae. 



Maxillae terminated by a 2-jointed palpus and setose maxillary lobe. Maxillae each 

 provided with four setae as follows: One on first segment of palpus, two on vaginant 

 membrane between palpus and palpifer, and one stouter and larger midway 

 between palpus and cardo . The stipes labii enforced posteriorly by a median triangular 

 chitinization bear 2-jointed palpi and a single pair of setae. Ligula bearing four small 

 setse. Mentum and submentum fused and bearing three large setae on each side. 

 Pronotum simple and undivided. Praescutal and scuto-scutellar areas roughly indi- 

 cated by rows of setae. Mesothoracic and metathoracic segments divided above into 

 two areas representing praescutum and scuto-scutellum ; below and adjacent to 

 epipleurum is the alar area. Below ventro-lateral suture are a well-defined hypo- 

 pieurum, coxal lobe, and eusternum. The thoracic spiracle, located on the pre- 

 epipleural lobe of the mesothorax, is bifore, with the fingerlike air tubes pointing 

 dorsad, and is somewhat larger than the abdominal spiracles. Ten abdominal seg- 

 ments, ninth small, tenth reduced. Each tergum of first eight abdominal segments 

 divided above into three distinct areas — praescutum, scutum, and scutellum. Below 

 and adjacent to epipleurum is the alar area. Below ventro-lateral suture are a well- 

 defined hypopleurum, coxal lobe, and eusternum. Abdominal segments provided 

 with setae as follows: Two on praescutum, five on scutellum, two on alar area, two on 

 epipleurum, one on coxal lobe, and two on eusternum. Each of the first eight abdom- 

 inal segments bears a bifore spiracle, that of the eighth being slightly larger than the 

 rest. 



Stage. Width of larval head. 



1 ' 0.22 to 0.23 mm. 



2 33 to .38 mm. 



3 53 to .57 mm. 



PtJPA. 



Pupa white when first transformed. Length, 2.8 to 3 mm.; width, about 1.3 

 mm. Tips of elytra attaining the sixth abdominal segment, tips of metathoracic tarsi 

 not extending beyond wing tips. Head rounded, beak short and broad. Head pro- 

 vided with two prominent spines toward the vertex, two smaller ones on sides 

 above eyes, a spine on each side of front between eyes, two pairs on beak between 

 frontal ones and base of antennae, two pairs on beak between base of antennae and tip 

 of beak, and four pairs of small setse on tip of beak. Prothorax provided with two pairs 

 ■of antero-marginal setigerous tubercles, one pair of antero-lateral, two pairs of postero- 

 lateral, and four pairs of dorsal setigerous tubercles. Mesonotum and metanotum 

 each provided with two pairs of spines. Abdomen with eight distinct dorsal tergites; 

 dorsal area of each armed with two pairs of large spines; lateral area of each tergite 

 armed with a spine at base of which is a small seta. Epipleural lobes each obscurely 

 armed with one or two minute setae. Ninth segment armed as usual with two promi- 

 nent pleural spines. 



