56 PROC. EXT. soc. WASH., VOL. 23, N T O. 3, MAR., 1921 



Glossa (= Lingua, sensu Schiodte) (lin figs. 13 and 14) fleshy, cushioned, 

 densely set with spines. 



Hypopharyngeal chitinization, (fig. 14) obliquely transverse, asymmetrical, 

 with right angle heavily chitinized and dorsally produced into a strong, obtuse 

 process which together with upper part of right molar structure forms a hard 

 strata against which upper portion of left molar part works; left angle triangular, 

 dorsally semimembranous, interiorly limited by a longitudinal series of numer- 

 ous spines; ventrally (hy fig. 13) both right and left angle with articulating 

 fossa for hypopharyngeal condyle (he fig. 13) of mandible. 



Legs (figs. 12 and 16). Rather long and slender, gradually and slightly 

 increasing in length from first to third; third leg about as long as lengths of meso- 

 and meta-thorax together; long, fine hairs scattered over entire surface of legs; 

 coxae cylindrical, distal end near trochanter without conical prolongation; coxa 

 of first leg twice, of third leg four times as long as thick; trochanter obconical, 

 about twice as long as thick and almost as thick as coxa; femur clavate-cylindri- 

 cal, slightly constricted at the middle inferiorly, about twice as long as thick; 

 tibia ovate-cylindrical, about three times as long as thick, length in proportion 

 to the length of femur as 4:5, thickness in proportion to thickness of femur as 

 2:3; claws subequal, all subuliform, somewhat incurved and about one third as 

 long as tibia. 



Body form (fig. 12). Clavate-cylindncal, about six times as long as thick; 

 hairs numerous and short, from seventh abdominal segment longer and scarcer. 



Color. Head testaceous, with heavily chitinous parts dark brown; body pale; 

 legs pale flavescent; prothorax with an irregularly outlined, chitinous, testaceous 

 impression in front of and almost as large as lower half of first dorsal area 

 (prescutum) of mesothorax. 



Body areas (fig. 12). Prothorax with one dorsal area; meso- and meta- 

 thorax with three dorsal areas (prescutum, scutum, scutellum); the first six 

 abdominal segments with three dorsal areas (prescutum, scutum, scutellum). 



Tenth abdominal segment ( = annulus analis, figs. 12, 15 and 23). Dorsally 

 distinct, considerably longer than ninth abdominal segment; one and a half 

 times as long as head (from tip of labrum to foramen occipitale); below with 

 scattered, apically hook-shaped setae, and with two posteriorly diverging rows 

 of about seven, short, straight, very pointed spines which are at a distance in 

 front from the anal slit almost equal to the length of the rows. 



Anal slit, transverse, terminal; upper anal lip (ua fig. 23) with rounded, concave 

 margin; lower lip (loa fig. 23) with margin rounded and convex and with a 

 slightly marked, straight, transverse impression between the two ends of the 

 slit (ti fig. 23). 



Spiracles (figs. 1, 2, 5 and 12). Orbicular; respiratory plate (R fig. 1) C- 

 shaped almost surrounding bulla (B fig. 1), with width less than half the length 

 of bulla; holes of plate (fig. 5) comparatively large, angulate-rotundate, irregu- 

 larly distributed. Concavity of thoracic respiratory plate facing posteriorly; of 

 abdominal plates anteriorly. 



An Undetermined Closely Related Ruteline Larva. 



(Possibly Strigoderma arboricola Fabricius.) 

 (Mature larva; in U. S. National Museum; from Riverton, 



