1426 THE BUTTERFLIES OF NEW ENGLAND. 



the width of the head ; inner frontal triangle reaching the centre of the head, fully 

 half as higli again as broad at the base; head rugulose; the lower portion of the face 

 with striae converging as usual toward the mouth parts; the whole head covered with 

 rather sparse and rather short, simple pile; ocelli as in Epargyreus, excepting that 

 the arcuation of the anterior ocelli is more gentle and they are more iuequidistant. 

 Dorsal shield of the first thoracic segment conspicuous, equal, roundly truncate shortly 

 above the spiracles; rest of body plump but elongate, largest at the third and fourth 

 abdominal segments, tapering more gently in front than behind, but rapidly in front of 

 the second thoracic segment ; the last segment posteriorly narrowed, strongly rounded ; 

 abdominal segments divided into a broad anterior section, occupying rather less than 

 one-third of the segment, and four posterior subequal sections ; surface sprinliled 

 rather sparsely with minute, cylindrical papillae scarcely smaller at tip tlian at base, 

 considerably higher than broad, and furnished with short, apically expandedbut other- 

 wise tapering hyaline bristles, the apical expansion more than equalling the base of the 

 bristle ; there is a laterodorsal series of minute craterif orm annuli situated in the middle 

 of the anterior section on the abdominal segments, in the anterior lialf of the dorsal 

 shield of the first thoracic segment and in the middle of the three or four subsections 

 into which the thoracic segments are divided ; an infralateral series of similar but ex- 

 ceedingly minute annuli in the same position ; on the second thoracic segment the 

 annuli of this series are larger than elsewhere aud lie at the upper extremity of a 

 large, broad, low, wart-like prominence, bearing in its centre a papilla with a long 

 bristle ; an infrastigmatal series on the abdominal segments situated a little in advance 

 of the stigmata but on the first abdominal segment directly beneath it and removed 

 from it only by tlie diameter of the spiracle; spiracles pretty large, prominent, cra- 

 teriform, broad, oval; legs and prolegs as in Epargyreus. 



Chrysalis. Prothorax scarcely more separate from the metathorax than from the 

 head, with the latter forming a rectangular mass only slightly narrower than themeso- 

 thorax, the front roundly protuberant in the middle half, it and all other protuberant 

 parts very sparsely pilose; mesothorax of nearly uniform width throughout, but 

 slightly the widest at the basal wing tubercles, which are double, superior and inferior, 

 but bluntly rounded and scarcely marked beyond the angulation of the body at this 

 point; a distinct tubercle in the middle of the mandibular plates; prothoracic spiracle 

 with a distinct, elevated and margined posterior lip, almost hemispherical, outwardly 

 just within the lateral limits of the prothorax; mesothorax of equal length and 

 breadth; beyond, the body scarcely enlarges to the third abdominal segment, beyond 

 which again it narrows but with greater rapidity and tapers conically to the cremas- 

 ter, interrupted only when the abdomen is extended by the protrusion of the mov- 

 able segments ; viewed laterally the mesothorax has an exceedingly low arcuation ; the 

 whole body is furnished with rather short, distant hairs arising from minute, scarcely 

 perceptible papillae. Movable abdominal segments ridged much as in Eudamus but 

 less prominently. Preanal button consisting of an extremely regular, transverse, 

 high, C-shaped ridge open toward the cremaster, the back of the C perfectly straight, 

 and preceded by some lumpy tubercles at the latero-ventral corners ; ninth abdominal 

 segment with a rough, transverse, dorsal ridge, falling off rapidly to the cremaster, 

 which, as viewed from above, is triangular, apically rather broadly truncate and 

 toward the base with a moderately deep, large, triangular depression ; beneath sulcate 

 as in the preceding genera ; viewed laterally it is nearly straight with a slight arcua- 

 tion and of nearly uniform size; only the extreme tip is armed with hooklets, which 

 are unusually long and slender, but otherwise shaped much as_in Eudamus. 



Thorybee belongs to a group of purely American forms very numerous 

 within the tropics ; this genus, however, is best developed in the northern 

 tropics and the adjoining temperate zone, and in the former region is per- 

 haps limited to the high lands alone, though Bates brought home one 

 species from Para. It extends north to the 50th degree of latitude on 



