90 BIFLLETIN 38, UNITED STATES NATIONAL MUSEUM. 



Yery distinct by the very even pale transverse lines, the distinct black 

 cell and the rich purple black collar. The species is not comnimon and 

 varies somewhat in the direction of an obsolescence of all maculation, 

 though these aberrant forms are not common. 



Group CLANDESTINA. 



Anterior tibia spinose; of normal length, the spinulation never very 

 heavy and sometimes sparse. The head is proportionately small and 

 considerably retracted, the front smooth. The antenme of the S are 

 simple in both sexes, somewhat ciliate. The palpi, except in vocalis, 

 are snbequal, not forming a club at tip of second joint. This is a 

 remarkably constant character, and entitled to considerable weight 

 because it associates species so closely allied and because the clavate 

 form of palpi is in other groups almost universal. The thorax is more 

 or less distinctly depressed in most species, and not at all or but incon- 

 spicuously tufted. The abdomen is also as a rule more or less depressed. 

 The primaries are of two types, ra,ther long, narrow, and subequal, the 

 outer margin rounded in clandestina, haviln', piiicipeUu, and atrlfrons. 

 These species all agree in even color, a tendency to strigose maculation, 

 the more or less marked obsolescence of the transverse lines and the 

 irregular, sometimes obsolete, ordinary spots. 



Piscipellis and atrifrons have the head blackish brown in front and 

 the ordinary spots entirely wanting. The former is larger, red-brown, 

 and has the s. t. line distinct, pale. The latter is smaller, carneous 

 gray, the median lines unusually approximate, the s. t. line wanting. 



Claiidestina and havikv have the front concoloious, the ordinary spots 

 outlined, but usually incompletely so; the orbicular is oval, longitudi- 

 nal, an irregular projection toward the reniform. In clandestuia the 

 dark color is even, the transverse lines rather indetinite. In the $ 

 there is a remarkable excavation on each side of the penultimate seg- 

 ment of abdomen beneath, more particularly described hereafter. In 

 luiviUv the peculiarity is wanting; the color is equally dark, but irro- 

 rate with gray, and the transverse lines are very broad and gray, much 

 more irregular than in clandesHiia. 



Tepperi^ Inbricans and its variety beata have shorter, rather more trig- 

 onate primaries, the outer margin still rounded, a broad black shade 

 crossing the collar. 



Tepperi is white, with the transverse lines and ordinary spots marked, 

 though not complete. Luhricans is dark carneous gray, outwardly 

 shaded with brownish re<l. The reniform only is faintly marked, and 

 the vestiture is very smooth and somewhat glistening. Tlie variety 

 heata agrees with the type in all respects, save that the red is replaced 

 by smoky black. 



Vocalis, palUdicollis J and opacifrons have trigonate primaries, the outer 

 margin oblique, a perceptible though very obtuse angulation being 



