444 Journal of Agricultural Research voi.xx,No. 6 



MATURE LARVA 



The mature larva measures from 2.5 to 3.5 mm. in length and is pearly 

 white in color. It is a footless, fleshy grub, very thick-bodied, the ven- 

 tral outline being approximately straight while the dorsal outline is 

 almost semicircular. The head is light brown in color, the anterior 

 margin and mandibles are much darker, the head is longer than broad 

 and somewhat wedge-shaped, and the sides are broadly rounded from middle 

 to apex. The apex is slightly angular. The sides are nearly straight 

 from the middle to the anterior angles, and the lateral area has an 

 oblique, longitudinal, lighter stripe or area. The epicranial and frontal 

 sutures are distinct and light in color; there are also two oblique, longi- 

 tudinal, light stripes rising from the frontal sutures and coalescing with 

 the epicranial suture near the apex. The frons is subtriangular with a 

 distinct dark median line from the posterior angle to the middle, indi- 

 cating a carina. The sutural margins are irregular or sinuate. The frons 

 is provided with five pairs of large setae, and each sutural margin bears a 

 large seta. Each epicranial lobe bears the following setae: One close 

 to the posterior angle of frons and located within the oblique, longitu- 

 dinal stripe rising from the frontal suture; one very small seta posterior 

 to this and near occiput, two anterior to it on disk of epicranium; two 

 opposite middle of frons ; one opposite middle of mandible ; one opposite 

 hypostomal angle of mandible; and one on hypostoma near base of 

 mandible. The epistoma is represented by the thickened anterior 

 margin of the front. It is distinctly darker in color, with the anterior 

 margin declivous and slightly curving and the lateral angles slightly 

 produced and elevated where they support the dorsal articulation of the 

 mandibles. The pleurostoma is represented by the somewhat darker 

 declivous area surrounding the mandibular foramen. The mandibles 

 are stout, triangular, with the apex produced into an acute apical tooth. 

 The inner edge toward the apex is provided with a subapical tooth and a 

 small medial tooth, no molar parts present. The dorsal area of the 

 mandible is provided with a pair of bristles set apart. The eye is repre- 

 sented by a well-defined black spot beneath the exoskeleton. 



The clypeus is attached in front of the frons and is broadly transverse. 

 It is broad at the base, the sides narrowing toward the apical angles, 

 and is slightly longer and broader than the labrum. It bears on the 

 epistomal margin two fine setae on each side. The labrum is distinctly 

 broader than long, with two lateral and a larger median lobe. It is 

 provided with six large setae behind the middle, two marginal, short, 

 thickened setae on each of the lateral lobes, and six similar marginal 

 setae on the median lobe. 



The cardo is present and distinct in the maxilla; the stipes is not 

 divided into stipes proper, subgalea, and palpifer but is one continuous 

 piece, with the anterior inner angle produced into a single setose lobe. 



