52 BULLETIN 1107, U. S. DEPARTMENT OF AGRICULTURE. 



chitinous, posteriorly convex band. No distinct palpiger labii. Palpus labii 

 with two joints, proportioned as those of the maxillary palpus, but only two- 

 thirds as long and wide as these. 



Ligula (li, PI. II, Figs. 29 and 20) : Triangular, as long as stipes labii, as 

 wide as long. Ventral surface fleshy, setose. Dorsal (buccal) surface finely 

 papillose; both ventral and dorsal surfaces simple, unpaired. 



Maxillular area (=paraglossa=paragnatha auctorum) {mxl, PI. II, Fig. 20) : 

 Paired, elongate, membranous, slightly lobate, near median line with a longi- 

 tudinal series of densely set, short setse. Between the two maxillular areas, a 

 narrow, slightly chitinized, longitudinal groove. 



Hypopharynx (hyp, PI. II, Fig. 20) : Membranous, nude, without chitinization 

 on the upper surface. On the underside of the skin with unpaired, elongate, 

 sling-shaped, anteriorly somewhat narrower thickening; possibly corresponding 

 to a pair of transversely connected hypopharyngeal rods. 



Epipharynx (PI. II, Fig. 31) : Membranous, anteriorly and laterally with 

 medium long setse; median disk nude. Epipharyngeal rods (er) well developed. 



Legs (PI. I, Fig. 16; PI. II, Fig. 30) : Three pairs; each pair widely separated 

 by intermediate sternal region ; all four-jointed, well developed, not fully of 

 medium size; total length and length of individual joints almost the same for 

 all pairs and equal to the height of head ; anterior pair somewhat stronger and 

 thicker than the two posterior ones. All legs whitish with strongly chitinized, 

 dark brown, claw-shaped tarsus. Coxa conical, projecting, with base twice as 

 wide as top ; length equal to diameter of base and about one-fifth of the length 

 of the entire leg; ventrally with long setse. Trochanter not distinct. Femur 

 subcylindrical, laterally somewhat flattened ; twice as long as coxa, twice as 

 long as thick; ventrally and laterally with numerous long, soft hairs. Tibia 

 of front leg (PI. II, Fig. 30) obovate, laterally somewhat flattened, bent at base; 

 tibiae of the other legs cylindrical and straight at base ; length of front tibia in 

 proportion to length of front femur as 2:3, lengths of the other tibiae in pro- 

 portion to the lengths of corresponding femora as 1:1; front tibia slightly nar- 

 rower than front femur; the other tibiae as thick as the corresponding femora. 

 Long, dark brown hairs, densely scattered over the entire surface. A t bial 

 spine present in front of claw-shaped tarsus ; largest on prothoracic tibia. 

 Claw-shaped tarsus inserted posteriorly on tip of tibia ; curved with concavity 

 forward. 



Body form (PI. I, Fig. 16) : Curved, clavate, cylindrical, gradually thicken- 

 ing from middle of abdomen toward prothorax ; prothorax approximately hemi- 

 globular. Body about four times as long as the median abdominal segments 

 are high ; greatest height of thoracic segments one-half more than the height 

 of the median abdominal segments. Epipleural lobes ventrally swollen and on 

 the median body segments with numerous light brown hairs tuftlike or gathered 

 together. 



Body chitinizations and color 20 : Dull white to light yellow, no chitinous 

 parts, except the oblique lateral prothoracic rod. Anterior and ventral end of 

 this rod distinguished by a light brown spot in front of the thoracic spiracle, 

 posterior and dorsal end marked as a dark brown line gradually tapering into 

 the middle of the side of the segment ; the intervening rest of the. rod colorless. 

 On the feeding larva the digestive tract shows through the tergites as a colored 

 line which varies from cream to dark red according to the. nature of its host. 

 This line tapers posteriorly from the first abdominal tergite, recurving in hook 

 shape on the lateral margins of the last two terga. 



Body areas (PI. I, Fig. 16): Cervical region with large presternal area; 

 prothorax with only a single distinct dorsal area ; mesothorax and metathorax 

 with two dorsal areas (prescutum and the united scutum and scutellum) ; the 

 first five abdominal segments with three dorsal areas (prescutum, scutum, 

 scutellum) ; the sixth with two (prescutum and the united scutum and scutel- 

 lum) ; the seventh to ninth segments with undivided dorsum. Seventh to ninth 

 abdominal terga slightly hairy in a transverse belt along the posterior margins 

 of the segments ; terga of the other segments smooth and naked. 



Ninth abdominal segment: Rounded, longer than eighth ; without armament of 

 any sort. 



20 This paragraph on body chitinization and color is copied from notes containing good 

 descriptions after living material with exact measurements of the different larval stages 

 given the author by R. D. Hartman for free use in preparation of the present study. 



(A. G. B.) 



