MEMOIRS OF TIIK NATIONAL ACADEMY OF SCIExNCES. 65 



venation and gouital arniaturo of tlio moths. I do not find it possible to divide up the genus, 

 although it would be iTiost desirable if so apt a name as Walsh's Sphingieampa could be retained. 

 Tlic most aberrant species as regards its venation is ^l. iiUxiliurata. and when we know the larva, 

 and have studied the male genitalia, this species may have to be i-eferred to a separate genus. 



1 scarcely think that from the facts here given Doctor Dyar is warranted in referring all 

 the species of Adelocephala which have simple antenna? in the female to Syssphinx. That name 

 should obviously be retained for .S'. inolina alone unless .S'. jnfrrxn should jjrove to be a member 

 of that genus. 



The larva of Syssjihlnx mollna differs from any of those of Adelocephala in the general 

 reduction of the spines. In venation it approaches nearest to A. hicolor in vein III, and in the 

 size and shape of the discal cell of the fore and hind wings; the anteimie do not seem to atiord 

 in this subfamily reliable characters. As regards venation, A. alhoUneata is the most aberrant, 

 while A. hicolor^ A. helUghrodtit^ and ^4. »Hhangvlata form a group by themselves; and .1. hmeta, 

 with A. montezunia, are closely allied. 



If we consider the S genital armature, Adelocephala ma\- be divided into three groups: 

 1, with the claspers rounded, A. hlsecta and heiUghrodttl ; 2, claspers acute, with the suranal 

 plate and penis ver\- different from 1, S. hicolor; 3, ^4. suhangulata, in which the armature differs 

 from all the other species examined. 



In his diagnosis of Othorene, Boisduval states that the female antenna? are pectinated. He 

 places under this genus the following species: A. cadmus, ja»>ti , /alhu\ mexicana, and vmrdli. 

 Doctor Dyar considers the pectination of the female antennte as a generic character, and places 

 A. hicolof and cadinm in Adelocephala, referring A. hisecta, A. }n-il!g^)nidtii, and live Bi-azilian 

 species to Syssphinx. However interesting this difference in the female antenuie max lie, the 

 two groups regarded as genera b\' Dyar appear to contain quite incongruous material, and do not 

 appear to us to be natural genera, as genera go. 



Until the larval forms of all the species of Adelocephala are known it would scarcel3- be 

 possible to present a natural classification, or to make an attempt at a phylogeny of the numerous 

 species of this genus. 



It seems evident that A. anthoiulis, whose larva has well-developed prothoracic dorsal spines, 

 is one of the most primitive species. Then would come our Brazilian larva (PI. Ill, fig. 1), and 

 that of AdeJore2)haIa hrei'is, figured by Peters (PI. Ill, fig. 5); also ^1. h-itamtha^ of which 

 Boisduval says: "La collerette est garnie dime rangee de petites pointes assez saillantes;" also, 

 that the dorsal abdominal spines are of equal length, while the dorsal and caudal horns "sont ur. 

 peu dentelees." 



Then would follow the larvjc v.ith long, even, dorsal spines, except those on the prothoracic 

 segment, which are reduced to button-like tubercles, as A. Kuhangidata (Peters, PI. III., fig. 4). 

 These would be succeeded by the more specialized species, in which the abdominal dorsal spines 

 are short and long on alternate segments, including ^4. uxirdU and our United States species. 



We are therefore under the circumstances compelled to begin with the most recent and best- 

 known species, A. bicolor, and the others occurring in the L'nited States, and then consider 

 those of Central, and lastly those of South America, though the genus originated in >.eoga?a. 



ADELOCEPIIj5i.LA. BICOLOR (Harris). 

 Plate XIX, fig. 3; 



Dryocampa iicofor Harris, Rep. In;'. Mass., p. 29;:!. 1841; Treatise ins. inj. veg., p. 408. 1862. 



Morris, Synopsis Lep. X. Ainer., p. 2:^2. 1862. 

 Sphinfficampa distigma Walsh, Proc. Bost. Soc. Xat. Hist., IX, p. 290. Feb., 1864. 

 Sphinqii-ampa bkohrr (?) Walsh. Proc. Bost. Soc. Xat. Hist., IX, p. 29:^. Feb., 1864. 

 Anisota hicolor Grote, Proc. Ent. Soc. Phil., Ill, p. 93. June, 1864. 

 Dryocampa hicolor Fackarv, Proc. Ent. Sf)c. Phil., Ill, p. 384. Xov., 1864. 

 Adelocipliala hicolor and var. immacvlata Jewett, Papilio, II, p. 144. 1882. 

 Adelocephala hicolor var. snprema Xeumoegen, Ent. Amer., I, p. 94. 1885. 

 fiphingicampa hicolor Kirbv, Syn. Cat. Lep. Het., I, p. 740. 1892. 



Sphingicampa hicolor Xeimoegex and Dyar, Jourii. X. Y. Ent. Soc, II, p. 148. Dec., 1894. 

 Adelocephala hicolor Dyar. Proc. Ent. Soc Wash., IV, p. 428. May 13, 1901. 



