686 THE BUTTERFLIES OF NEW ENGLAND. 



gently curved; prolegs pretty long, large at base, the last joint much slenderer and 

 exserted, armed each with a nearly complete circle of seven slender hooklets, curved 

 exceedingly. 



As appears by this description, Gruber has given an inaccurate account of the tirst 

 stage of this insect, so much so that I at first thought he must have had specimens 

 ])efore him whicli were wrongly named ; but as similar errors occur in the allied forms, it 

 must be set down as an error of observation. No distinction is made by him between 

 the character of the spicules on this and the other genera of Melitaeidi and Argyuuidl ; 

 in the present genus, however, they are excessively slight, scarcely perceptible with 

 an enlargement of 250 diameters, while in Phyciodes they are distinct enough, and in 

 Brentliis almost conspicuous. But a worse error is found in his statement of the dis- 

 position of the l)ristles, as they are all paired and there is no mediodorsal row. 



Mature caterpillar. Head well rounded, broadest in the middle, fully as broad as 

 high, the sides broadly rounded, the summit of either hemisphere a little tumid, 

 slightly protuberant a little outside and in front of the middle, the suture between 

 pretty deeply depressed, deepest in the middle, the front appressed but not flat; tri- 

 angle more than half as high as broad, reaching about to the middle of the front, the 

 sutures a little impressed ; the whole head covered with minute and larger tubercles, 

 smallest and least abundant on the front, largest and most abundant on the summit, 

 the largest at the highest point, conical, and as broad as high, all emitting rather long, 

 scarcely tapering, bristle-like hairs. Antennae with the second joint short, less than 

 half as long as Ijroad, the tliird considerably slenderer, fully twice as long as broad, 

 bluntly rounded at the tip, the fourth minute. Ocelli six in number, five of them 

 arranged in the third of a semicircle, its convexity forward, the middle three closely 

 approximate, the upper and lower at aljout their own diameter's distance from the 

 nearest one, the sixth behind the others, at equal distances from the second and fifth, 

 counting from above, and forming with them a right angle. Labrum not vei'y large, 

 well rounded, broadly ridged longitudinally, the front margin broadly and roundly ex- 

 cised to a moderate depth. Mandibles small, slender, not broad, armed at the edge 

 with four or five sharp triangular denticles, a little longer than broad. Maxillary 

 palpi short and rather stout, the two lobes reaching the same point, the joints similar 

 to those of Cinclidia. Spinneret short, moderately slender. 



Body cylindrical, tapering forward somewhat on the thoracic segments, otherwise 

 equal, furnished with many spines arranged in longitudinal rows, one in a series to a 

 segment; the spines are moderately long, pretty stout, tapering regularly to a blunt 

 tip, and supplied pretty abundantly with small, conical wartlets, as high as broad, 

 each bearing a scarcely tapering, needle-like thorn, nearly or quite as long as the 

 spine itself, and directed upward very little above the horizontal; they are of nearly 

 equal length in all parts of the body, and are arranged as follows : a dorsal row 

 placed anteriorly, upon the first to eighth abdominal segments, the last with two, 

 the supplementary one placed posteriorly; a laterodorsal series, placed a little in ad- 

 vance of the middle of the segment, upon the second and third thoracic and the first 

 to eighth abdominal segments; a laterostigmatal series, placed anteriorly on the sec- 

 ond to third thoracic and first to ninth abdominal segments, the last with two 

 longer than the others, the supplementary one placed posteriorly; an infrastigmatal 

 series placed centrally on the thoracic and first to eighth abdominal segments, and a 

 ventro-stigmatal series placed centrally on the thoracic and the first to seventh ab- 

 dominal segments, the second to sixth abdominal segments having two each; the first 

 thi)racic segment, besides the spines mentioned, has a pair of subdorsal spines, very 

 small, but croAvded with warts as large as those on the other spines, and bearing as 

 long hairs ; and a doul)le, supralateral, similar one placed transversely, all on the ante- 

 rior part of the segment. Body sprinkled rather sparsely with moderately long, taper- 

 ing hairs seated on minute warts. Spiracles small, ol)ovate, half as long again as broad. 

 Legs small, short, appressed, rather slender, tapering, the claws moderately slender, 

 pretty strongly heeled at base, beyond tapering, gently curved. Prolegs very short 

 and moderately stout, tapering a little, with about twenty hooklets arranged in a double 



