54 Bulletin American Museum of Natural History [Vol. XLII 



angle; a single inner seta near its base; palpi shorter, gradually tapering; the first 

 segment narrower than the palpifer and only about one-fourth the length of the 

 second segment; the third is a little shorter than the second and provided with 

 terminal sense-cones. 



Labium extending forward almost as far as the tips of the mandibles; the first 

 segment of the palpus short ; the second segment about four times as long but nearly 

 the same width and bearing several terminal sense-cones; ligula prominent, slender 

 and almost twice as long as the first palpal segment; palpiger quadrate with sides 

 slightly rounded; two long setae in the membrane at the base of the ligula; mentum 

 slightly wider than palpiger, longer than wide and constricted a little in the middle; 

 its dorsal surface with numerous short spines towards the sides and in the middle; 

 the submentum extremely transverse and joint-like. 



Prothorax with sides rounded, about the same width as the head. Anterior and 

 posterior margins of pronotum narrowly non-chitinized; sagittal line present, pro- 

 sternum with two large sclerites in front of the coxae and contiguous along the median 

 line. Meso- and metathorax the same width as the prothorax but about one-half as 

 long; sclerites of meso- and metanotum fairly large and irregular; the former sub- 

 triangular and less irregular than the latter, which are transverse and each with a 

 posterior T-shaped projection. Epi- and hypopleurites both rounded, bearing a seta 

 surmounting a little tubercle. Mesothoracic spiracles each at the tip of a small tuber- 

 cle. Two small, elongate, pro-mesotergal sclerites present. Sagittal line prominent. 



Legs about as long as the thorax is wide; coxa? transverse; femora nearly as long 

 as the tibiae; tarsi shorter than the latter, claw-like and with two inner seta?, one more 

 proximal and shorter. The anterior coxa? are closer together than the four posterior 

 coxae, which are about the same distance apart. 



Abdomen with eight distinct segments and very slightly narrowed caudally, 

 ninth and tenth segments rudimentary. The first seven tergites similar and separated 

 by a conspicuous intersegmental membrane; each of the former has three transverse 

 folds (scutellar fold indistinct) while the latter has only one. The praescuta bear two, 

 oval, chitinized patches, those on the first segment slightly larger than the others. 

 A transverse row of four tubercles, each bearing a seta, present on the posterior folds 

 of the scuta and each segment with the spiracles on little conical tubercles. Epi- and 

 hypopleurites prominently lobed and intersegmental membranes with a single 

 prominent lateral lobe. Sternites with folds corresponding to those of the tergites. 

 The eighth tergite respresents the superior valve of the stigmatic atrium and bears 

 a large chitinous plate, a little broader than long and somewhat semicircular, being 

 rounded in front. The caudal border of the superior valve is slightly chitinized, 

 bears a few setae, and is indistinctly quadrilobed, the two middle lobes more promi- 

 nent. Ninth tergite trilobed. The entire structure closely resembles that of Cym- 

 biodyta. 



Full-grown Larva. — Length, 15 mm.; width, 2.96 mm. Color brownish above 

 and dirty white or gray below. Tubercles and lobes of body much more pronounced, 

 as well as the small brown setae covering the integument. Head measures 0.86 mm. 

 along the dorsal line and 1.08-1.2 mm. in width. First segment of antennae about 

 twice as long as the second. Terminal segment of palpus noticeably shorter than 

 penultimate. Prothorax with several, small, dark markings on the pronotum and 

 slightly widened posteriorly. Meso- and metathorax gradually wider than the pro- 

 thorax. The stem of the T-shaped projections of the mesonotal sclerites lost. Legs 



