REVISION OF SPECIES OF THE GENUS AOROTIS. 123 



narrow tenniiial space. ClaviCorin distinct beyond tlic t. a. liuc, laigfc, 

 dark. Orbicular elongate, bottle shaped, outlined ;ind centered with 

 blackish. Reniforni large, outlined with black and almost tilled with 

 smoky brown. Se<;ondaries clean wliite, margins and veins sonu'times 

 more or less evidently dusky; beneath as in anne.va. Thorax concolor- 

 ous with primaries, patagia*. strongly irrorate with gray; collar blackish, 

 with a distinct black liiu». 



Ex'i.ands \()-\\ '; LdO-l.T.") inches. 



. Habitat. —New Jersey, south to Cuba, west to California. 



Not uncommon in its localiti«'s and easily distii!guishe<l from its allies 



are already pointed out. The species is not uncommon in the District 



of Columbia, and 1 have it from New Jersey, but 1 believe iu)t farther 



north. Its range south and west is parallel with that of (lune.va. The 



early stages have been described by Dr. Kiley in some xVgricultural Re- 



l)ort. 



Genus POROSAGROTIS Sinitli. 



All the tibia spinose, armature of anterior jiair very heavy. Front 

 somewhat bulging, tuberculate, and pitted. Antenna of S serrate and 

 bristled or pectinate, the brandies ciliate; pectinations moderate in 

 length, rrimaries somewhat variable in shape; most obtuse \u rilcy- 

 ana^ the apices most produced iu dollii. Thorax stout, hairy, the tuft- 

 ings indetinite; in the S the abdomen is furnished with loose, long 

 hair, forming indistinct tuftings. The S genitalia are alike iu all the 

 species, and this character is the distinguishing feature of the group, 

 which else is closely allied to pifychroiis and the forms in whi(;h the 

 leugthily bifurcate type of clasper is so constant. In this genus the 

 harpes are broad and moderately long; the outer margin is very ob- 

 lique, the upper angle long drawn out. The clasper consists of a simple, 

 short, curved, corneous hook. This peculiarity is the one character 

 which distinguishes this genus, and the absolute identity iu this respect 

 of the species is remarkable indeed. 



Two well-marked subgroups are indicated by the characiter of the 

 S anteiuue. The lirst, of which murdcniild is typical, has the antenna*, 

 serrate and bristled; of the same type as in the gieat mass of species 

 ill the groups with furcate clasper; the ordinary spots are illy defined, 

 scarcely more than dusky blotches; the transverse maculation is very 

 simple, often obsolete, and the sjtecies are very uniforndy colored. 



Four of the species belong here. Of these, mitracnuUt is eastern, of a 

 uniform bright ash gray color, the maculation reduced to a minimum, 

 the transverse Hues almost obsolete. 



Catcnula is western, and the close ally of the i)receding; differing in 

 the more yellowish cast of primaries, aiul the distinct transverse lines. 



Obcsuhi, also western, is very dilferent from both the i)receding. It 

 is more robust, the primaries more equal, the apices rounded. The 

 color here is also even yellowish gray, but the line is more sordid, and 

 broken by numerous fine but very irregularly distributed fuscous points. 



