186 Journal New York Entomological Society, t^'o'- xxvii. 



neath with silken hairs very short or absent ; front of head 

 and eyes prominent. Expands about 50 mm. 



triangulata Davis 

 GG. Pronotum in mature individuals black with the central portions 

 variegated with orange or yellow. Basal cell of fore 

 wings yellowish or translucent. 

 Head small, front prominent ; discal yellow marks extending 

 from the mesonotal X to the front margin of the meso- 

 notum. The veins surrounding the first seven marginal 

 cells of fore wing infuscated. Expands about 42 mm. 



synodica (Say) 

 Membranes at base of fore and hind wings pinkish, remain- 

 der of wing venation yellowish. The W mark on the 

 front portion of the mesonotum separated from the meso- 

 notal X ; tergum darker, the terminal segments nearly all 

 yellow as in synodica. Expands about 46 mm. 



balli new species 

 AA. Male uncus hooked at extremity. 



B. Rather slender bodied species with the venation of fore and hind 

 wings colored almost uniformly throughout. 

 Black clothed with minute dark rufus hairs giving the insect a 

 dull reddish aspect. Expands about 55 mm. 



rubrovenosa Davis 

 BB. Stouter bodied species, the fore and hind wings variegated with 

 orange and black at the base. 

 C. Third marginal cell more than one half as long as second 

 ulnar area adjoining and immediately behind it. 

 D. Expand about 55 to 60 mm. Black species with basal 

 portions of fore and hind wings orange variegated 

 with black. 

 E. Front of head not conspicuously produced ; under 

 side of abdomen with very numerous long 

 silken hairs. 

 F. Abdomen black above or nearly so in var. cali- 

 fornica. 

 Almost wholly black above, pronotum dull 

 rufus, particularly on the sides ; abdomen 

 beneath with the central area black, ex- 

 cept the reddish or yellowish posterior 

 margin of each segment; valve black on 

 under side. Expands about 60 mm. 



vanduzeei Distant 



Dorsal markings much lighter, especially 



about the mesonotal X ; abdomen beneath 



with a black spot on each segment except 



