33^ TRANS. ST. LOUIS ACAD. SCIENCE. 



with bristles (the parts not clearly shown in figure) : the labium small, 

 trapezoidal, highly polished, with the spinneret (h) twice as long as palpi 

 (g) which are small, recurved and 2-jointed, exclusive of bulbus : a few 

 stout bristles on labrum, on palpigerous piece of maxilla, on mentum, base 

 of mandibles and around the ocelli, which are not easily distinguished from 

 the more globular of the shagreenations. Cervical shield more glabrous 

 than head, and scarcely darker than the body except around hind border. 

 Thoracic legs very short but stout, with the horny parts deep brown, and 

 sparsely armed with bristles. Prolegs well developed, the hooks in double 

 row and forming a distinct purple-brown, transversely oval annulus, but 

 slightly broken at the narrow ends. Anal shield rounded behind, corea- 

 ceous rather than corneous, and with a slight increase of bristly hairs, 

 especially around border. Stigmata large, with a purple-brown, oval 

 annulus. 



Pupa — Average length i.so inches. Cylindrical; broadest at shoul- 

 ders, the abdomen large, recurving ventrally toward anus, and terminating 

 in a broad, flattened, posteriorly rounded, transverse, slightly decurving 

 flap, the borders thickened basally and extending ventrally so as to sur- 

 round the bilobed anus. Eyes prominent, with a transverse carina : wing- 

 sheaths reaching hind part of 4th abdominal joint, ventrally; hind tarsi 

 to about the hind third of these, and the club of antennae — which forms a 

 prominent bulge but tapers to a point — nearly as far. Surface but slightly 

 polished and faintly corrugate; a few extremely minute bristle-like spines 

 distributed over the abdominal joints, dorsally, and the two or three ter- 

 minal joints with stiff rufous hairs, increasing posteriorly and thickest on 

 the flap. Chitinous covering delicate, and all the members clearly de- 

 fined. Prothoracic spiracle showing as an opaque, elliptic-ovoid wart. 

 Color brown-black anteriorly, paler on the abdomen, and more or less 

 densely covered with a white powdery secretion like that which character- 

 izes the full-grown larva. 



Imago. — Generic Characters — Head small, the width, including eyes, not 

 much more than half that of the mesothorax; the antennal bulbus large, 

 and the inter-antennal space not wider than one of the sockets; covered 

 with rather evenly shorn, dense hairs, and flattened scales not overhang- 

 ing the eyes. Eyes small and smooth. No ocelli. Labial palpi (Fig. 30, 

 c) stout and short, not reaching to top of eyes, 3-jointed, the basal joint 

 broad but short, the middle joint 4 times as long, the terminal joint tuber- 

 culous and I as long as the preceding : clothed in short and thick hair-like 

 scales. Tongue filiform, rather more than £ the antennal length. Anten- 

 nae rigid, cylindrical, terminating in an elongate knob (Fig. 30, d) which 

 is slightly flattened and slightly tapering and recurved at tip, but without 

 apical spine or tuft : having rather more (o*) or rather less (?) than half 

 the costal length of primaries. Thorax very robust, recalling that of 

 Xyleutes ; clothed with close-lying hair which becomes longer and looser 

 behind; the patagia rather broad, forming two crescent-shaped, slightly 

 raised layers; the tegulae closely appressed. Legs (Fig. 30, e,f, g, front, 



