199 



pollinose, emarginate cross-band; wings dark; males very differ- 

 ent in coloration from the females (4O). . . Dizonias. 

 Abdomen less elongate, with five or six white-pollinose entire or 

 interrupted cross-bands.* ....... 15 



15. Style of antennae vestigial ; veins at outer side of the discal and 



fourth posterior cells parallel or nearly so (8, 34). Psilocurus. 

 Style distinct, though small; veins at outer side of discal and 

 fourth posterior cells not at all parallel; marginal cell narrowly 

 closed or open; first posterior cell open, closed or narrowed; 

 face gently or not at all convex, more or less clothed with hair. 

 (Triclis-\] (9) Laphystia. 



16. Antennae elongate, composed of five joints; nearly bare species of 



considerable size. ........ 17 



Antennae less elongate or rather short, the third joint with or 

 without a short or slender style; no spine on upper side of third 

 joint. ........... 19 



17. First joint of antennae about three times the length of the second, 



third elongate, fourth and fifth of nearly equal length; third 



and fourth at their tip with two lobes or processes reaching to 



about the middle of the following joint (11). Myelaphus. 



Third and fourth antennal joints not lobed at tip. . . 18 



iS. First and second joints of antennae of nearly equal length, the 

 third elongate, fourth short, fifth elongate and densely pubes- 

 cent (1O). Ceraturgus. 



First four joints of antennae as in preceding, the fifth oval, with 

 a short lateral spine Ceraturgopsis. 



19. Style of antennae short, thick, obtuse, not easily distinguishable 



from the third joint, or, if so, forming apparent antennal joints; 

 antennae more or less elongate. ..... 20 



Terminal style of the antennae more slender than the third joint, 

 divergent or easily distinguishable; antennae usually shorter. 22 



20. Nearly bare species; face flattened, bare, save below. Small or 



rather small species, for the most part shining or metallic black, 

 with narrow or cylindrical abdomen and large wings. . 21 



* If thorax and abdomen yellow and black, without pollinose cross- 

 binds, the wings conspicuously orange-colored and blackish, Cacodcs- 

 mon (Pro/epsis) S. A. 



t The so-called species of Triclis and Laphystia are very variable, 

 and I doubt their generic distinction, notwithstanding the open or 

 closed first posterior cell. 



