80 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



of the wing- is a fawn gray; the hind wing as in $ ; in the fore wings the two lines and fringe 

 are dark brown, and the surface is distinctly strigated; the dark round discal spot is about one- 

 half as wide as the space between the two lines. 



Beneath, a little less roseate, the hlaek round discal spot as in S . Tlie outer line on the 

 hind wings is more distinct than in ^4. hugei^ though it disappears in the middle of the wing. 

 All the legs are decidedly a pearl-gray and with the costa of the wings concolorous in both paii's. 



Expanse of the fore wings, S , 51 mm.; 9 , 60 mm. Length of one fore wing, S , 25 mm.; 

 9 , 30 mm. Breadth of one fore wing, S , 13 mm. ; 9,15 mm. Length of hind wing, S , 12 mm. ; 

 9 , 20 mm. Breadth of hind wing, S , 12k mm.; 9 . 15 mm. 



Although the hind wings of the S are not triangular as in A. wanh'i, etc., yet the equality 

 in size of the larger dorsal spines of the thoracic and abdominal segments of the larva shows that 

 this is the most primitive of the Central American forms. ^4. /lOgci will probably be found to 

 be a synonym of this species. 



Larva (PI. Ill, flgs. 2, 2a XLIX, tigs. 3, 3a). — A blown example of a remarkably beautiful 

 larva of this genus was collected by Mr. Jacol) Doll at Esper Ranch, Brownsville, Tex., in the 

 spring of 1903, and I am indebted to him for the pi'ivilege of having it drawn l)v Mr. Joutel 

 -and described. It ditlers remarkably in coloration, but belongs to the same section of the genus 

 as A. hici/Ior. 



Length, 51 mm. Body rather thick. Head a little more rounded, not so high and narrow 

 above as in the other Texan (San Antonio) larva, which may be a variation of this species. 

 The head is pea green, but above the clypeus and on the sides of a glaucous green: no lateral 

 stripe is present. 



Prothoracic segment with the tubercles on the front edge of the same shape and size, form- 

 ing i-ounded smooth bosses, the two dorsal ones very slightly larger than the other. 



The eight thoracic horns of equal size and length, shorter than in the San Antonio larva, 

 nuich shorter than the body is thick, with low slightly marked rounded spinules, which are much 

 less prominent; the horns are recurved and are deep pink, green at the tip. 



The spines of the dorsal series (/) on abdominal segment 1 are minute and short, cherry red; 

 they are nuich reduced in size compared with those on segments 2, 4, and 6; no higher than 

 broad. On abdominal segments 2, 4, and 6 the dorsal tubercles are large, stout, flattened, 

 conical, cherry red on the inside, and externally porcelain white. Those on segment 6 are a 

 little larger than the others. Those of the subdorsal row (on segments 4, 6, and 7) are about 

 two-thirds as large as those of the dorsal series. 



On abdominal segments 4 and (J a yellowish streak connects the spiracle and subdorsal spine. 



Caudal horn short and stout; not so long and large as in the San Antonio larva; bearing low, 

 rounded, not prominent, tubercles. The horn is cherry red on the basal half, and beyond green 

 to the end. 



Suranal plate with a single row of large yellowish-green bosses on the edge, not crowded as 

 in the San Antonio larva. Spiracles pale sienna brown. A lateral lilac line shaded beneath with 

 yellowish green. 



This is a wonderfully beautiful caterpillar, and differs from anj' other known species in the 

 bright cherry-red tubei'cles, which externally are porcelain white, not like burnished silver or 

 gold, as seen in A. hirolor, etc. 



It is perhaps a later form than .4. hlcolor and its allies, and appears to have undergone a 

 slightly greater moditication in its style of coloration. 



The larva here figured and descril)ed has been referred to A. h'tas by Doctor Dyar. this 

 being the only other species known to inhabit both Arizona and Texas. 



The pair figured on Plate XXXIII was raised from the larv;c by Mr. Jacob Doll and identified 

 as A. Islaa l)y Doctor Dyar. and I find it will agree with Hoisduval's description. 



Two larvae collected by Mr. Jacob Doll at Brownsville, Tex., in April, 19(12, when compared 

 with those from San Antonio differ decidedly in the broader, more triangular abdominal dorsal 

 and subdorsal spines, while theie are nuich fewer granulations; also the caudal horn is a little 

 shorter. 



