8< > MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



of the wing is a fawn gray; the hind wing as in S ; in tlie 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 black round discal spot as in s . The outer line on the 

 hind wings is more distinct than in ^1. hoyei, though it disappears in the middle of the wing. 

 All the legs are decidedly a pearl-graj' and with the costa of the wings concolorous in both pairs. 



Expanse of the fore wings, S , 51 mm.: 9 . *i<' mm. Length of one fore wing, i , 25 mm.: 

 9 , 30 mm. Breadth of one fore wing, ^^.IMnnn.: 9 , 15 mm. Length of hind wing, 2' , 12 mm.: 

 9 , 20 mm. Breadth of hind wing, S , 12i^ mm.: 9 7 15 mm. 



Altliough the hind wings of the S are not triangular as in ^1. irardii. etc., yet the etiualitj' 

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

 this is the most primitive of the Central American forms. ^1. Juigel will probably be found to 

 be a synonym of this species. 



Liirrit (PI. Ill, tigs. 2, 'la XLIX, tigs. 3, ?>a). — A blown example of a remarkably beautiful 

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

 spring of 1903, and I am indebted to him for the privilege of having it drawn by Mr. Joutel 

 and described. It ditiers reniarkat)ly in coloration, but Ijelongs to the same section of the genus 

 as A. hlcolm'. 



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

 above as in the otiier Texan (San Antonio) larva, which maj' 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 rounded smooth bosses, the two dorsal ones very slightl_y larger than the other. 



The eight thoracic horns of equal size and length, shorter than in the San Antonio lai'va. 

 niucli shorter than the body is thick, with low slightly marked rounded spinules. which are nnich 

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



Tiie spines of the dorsal series {i) on a!)domiiial segment 1 are minute and short, cherry red; 

 they are much reduced in size compared with those on segments 2, -l, 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 externallj' porcelain white. Those on segment <i 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 6 a yellowish streak connects the spiracle and subdorsal spine. 



Caudal boi-n 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 l)asal lialf, and bej'ond green 

 to the end. 



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

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

 yellowish green. 



This is a wonderfully beautiful caterpillar, and dilb'rs from any other known species in the 

 luight cherry-red tubercles, which externally are ])orcciain white, not like burnished silver or 

 gold, as seen in ^1. hlcdlor^ etc. 



It is perhaps a later form tiian A. h!r,,l(,r ;\m\ its allies, and ai)pears to have undergone a 

 slightly greater moditication in its style of coloration. 



The larva here figured and described has been referred to A. ixlas l)y Doctor Dyar, this 

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



The pair figured on Plate XXXIII was raised from the larva' Ity Mr. Jacob Doll and identified 

 as .1. isiax l)y Doctor Dyar, and I find it will agree with Boisduval's description. 



Two larviB collected by Mr. Jacob Doll at Brownsville, Tex., in April, l!tt)2, when compared 

 with those from Siin .Vntonio diH'er decidedly in the bi-oader, more triangular abdominal dorsal 

 and subdorsal spines, wliii(! there are uuicii fewer granulations; also the caudal horn is a little 

 shorter. 



