114 ENTOMOLOGICAL NEWS. April, '04] 



A New Thanaos from Southern California. 



BY FORDYCE GRINNELL, JR., Palo Alto, Cal. 



Thanaos callidus, n. sp. 



$. Antennae blackish throughout, with inconspicuous annulations 

 extending to the club ; club entirely black. Palpi clothed with long, 

 black hair, intermixed with grayish hairs, the ventral part more gray 

 than the dorsal. Eyes very dark brown or black. Primaries blackish, 

 thickly overlaid by grayish hairs ; dark brown towards inner edge. 

 Fringes with long hairs, same color as adjacent parts of wing, i mm. 

 wide ; a black line extending parallel to the fringe. The discal area is 

 marked by four black crescents, the concave sides facing ; the crescents 

 forming a 1 1. Midway between these discal markings and the outer edge 

 are two rows of black dashes, crescent-like and forming almost two par- 

 allel lines, 1.5 mm. apart. The inner row extends from the costa three- 

 quarters of the way to the inner margin, while the outer extends about 

 half-way. Secondaries dark brown, sprinkled with long, black hairs ; 

 a tortuous row of round, lighter spots extends from costa to inner mar- 

 gin, parallel to outer margin. Fringes continuous with those of the pri- 

 maries. Underside brownish, lighter towards outer margin. Fringes 

 blackish. A row of round whitish spots on secondaries parallel to outer 

 margin. 



(j\ Differs from the female in having the upper side of primaries black- 

 ish, with fewer gray hairs, and these confined to the region of the anal 

 angle, but spreading to the apex. A small white discal spot, and midway 

 between this and outer margin a group of three whitish spots, arranged 

 in a diagonal line and close together ; a somewhat large, white spot in 

 the same plane, half-way between costal and inner margin. Secondaries 

 black or very dark brown, a slighter darker shade along the outer mar- 

 gin, otherwise without markings. Underside of primaries brownish, with 

 the same markings as the upper side. The secondaries brownish with a 

 faint indication of three whitish spots in the anal angle. Thorax and 

 abdomen with black hairs, interspersed with grayish ones. Expanse of 

 male and female 30 mm. 



Appendages of the male : The side or clasping organ is large and 

 quadrangular in outline ; the cephalic portion tapers more or less ab- 

 ruptly downward and ends in a knob-shaped structure. The thickest 

 portion is in the middle which is marked by a suture. The caudal por- 

 tion consists of three projections ; the lower is longest and tapers to a 

 point, but enlarges in the middle and toward the cephalic part and is 

 clothed with quite long hairs. The upper is about half the length of the 

 lower, is slightly curved and blunt at the extremity, with a few long hairs. 

 The middle projection is short and distinctly knobbed and leans forward 

 into the arch formed by the upper organ. The structure which holds the 

 anal opening is very peculiar in shape ; it projects up between the two 



