522 COLLEGE OP AGRICULTURE 



Ished tubercules, each with a slight median depression. The 

 two terminal spines of the abdomen have a very characteristic 

 shape. Bach ends in an enlargement resembling a foot with 

 the' heel pointing inward and the toe outward. Vestiges of the 

 anal legs and genital openings indistinct. General color dark 

 reddish-brown. The winter is passed in the pupa stage, but 

 some of "the moths emerge during the late summer or early fa,ll. 

 Whether a sufficient number come out to produce a Becohd brood 

 or not remains to be determined. Large numbers of pupae were 

 found July 20, so it seems quite probable there may be a small 

 second brood. 



Relation to OtTier Heterocampae. All the moths of this group 

 look very much alike, there being a close relationship between 

 not only the members of the genus Eeterocampa, but also the 

 adults of the entire family Notodontidae. There is much simi- 

 larity in markings, as well as other details of structure. In a 

 synopsis of the genera of the sub-family Heterocampinae, Pack- 

 ard gives the following distinguishing characters: "Fore-wings 

 produced toward the apex, outer edge usually very oblique; a 

 long subcostal cell, hind wings short and rounded, male antennae 

 filamental at the end, larvae varying from being simply nocturi- 

 form to having long substenapodlform anal legs." Of the seven 

 genera which constitute this sub-family none are well marked, 

 grading off almost insensibly into one another. The usually short 

 hind wings with their well-rounded apexes, the broad stout palpi, 

 and the very hairy thorax, are apparently the chief characters. 



Twelve species belong to the genus, all with very similar mark- 

 ings, but in H. guttiv'itta the markings are less distinct than 

 usual, the fore wings ash-gray, and, according ta Packard, usually 

 a discal mark, enclosed in a large diffuse lunate pale ashen patch. 

 The latter mark, however is not always distinct. 



The closest allied form of this particular species is H. bkindata. 

 On casual examination these two forms appear almost identical. 

 But all the specimens studied of H. biundata have two definite 

 brownish scallop-shaped bands crossing the base of the fore -wing 

 which are either very faint or entirely lacking in H. guttivitta. 

 The general coloring of H. biundata is lighter, with a yellowish 

 tinge, while the markings are much more distinct, the wia^ and 

 the thorax are marked with a deeper brown, than in H, gutti'Sitta. 

 The larva of H. biimdata has a more pointed head than H. gutti- 

 vatta, and lacks in the early stages the horns as well as the 

 brown saddle-shaped mark, although a brown spot is usually 

 present on the side of the body. 



