Dec, 191:2.] Grossbeck: North American Geometrid.e. 283 



Petrophora costimacula, new species. 



Expanse, 30 mm. Palpi brown, tipped with white; front wholly white, 

 vertex brown. Thorax and abdomen smoky-gray, the former with the collar 

 and disk brown. All wings above smoky-gray, the fringes paler, and a stripe 

 along costa whitish interrupted by two brownish spots near middle and outer 

 two thirds and checkered at the base and apex with short transverse strigae. 

 Beneath, primaries smoky except at costa where they are yellowish irrorate with 

 brown specks which, two thirds out from base, form a decided brown spot ; 

 secondaries concolorous with costal area of primaries and crossed by numer- 

 ous short brown strigae which near inner margin at center collect into a large 

 spot. Discal spot large, brown, contrasting. 



Type. — One male in the American Museum of Natural History 

 (Grossbeck collection). 



Habitat.- — San Diego, California. 



A species slightly resembling Staninodcs gibbicosfata and 5". 

 albiapicata, but generically distinct from both. In Petrophora it falls 

 in the same group with riibrosiiffusa and voluccr. 



DASYCOSYMBIA, new genus. 



Palpi moderate in length, slender, ascending, end member minute; 

 tongue well developed ; front smooth ; antenna of both sexes simple, 

 in male strongly ciliated below. Thorax and abdomen untufted. 

 Middle tibias with a single pair of spurs, posterior tibiae of male 

 with a single long spur one third the length of the tibia from the base 

 and with a large dense hair-tuft which with the long hairs of the 

 tarsal joints completely conceals the tarsi, the claws of which are 

 obsolete ; posterior tibiae of female normal, with double pair of spurs. 

 Fore wings with 12 veins and two accessory cells, R^, from end of 

 apical accessory cell, R.,, R^ and R^ on one stalk. Hind wings with 

 Sc. anastomosing with R for a short distance just beyond humeral 

 bend, ikf, present. 



Type. — Dasycosymbia gracilata Gross. 



Allied to Charommatcca Hulst but differing in the presence of the 

 long spur on the hind tibia of the male and the extremely dense hair- 

 tuft on this same joint which in Charommatcca is a comparatively 

 slight fringe. 

 Dasycosymbia gracilata, new species. 



Expanse, 23.5-25 mm. Front, posterior portion of vertex and superior por- 

 tion of palpi dark carmine-brown; remainder of head pale testaceous. Thorax, 



