244 Journal New York Entomological Society. [Voi. vii. 



3. The weak discal vein (Media) dividing the cell is forked at tip, 

 the fork forming the closure of the cell, short and open. At branch J it 

 becomes long and closed without, more or less distinctly, by a cross vein. 



4. The fore wings have twelve veins, but at stem 0-R vein 8 has 

 disappeared. 



The character is gained hvice in phyioge>iy. 



1. The palpi-^= may have been short and porrect, not reaching vertex 

 of head. At branch a they become elongated, upturned, reaching 

 vertex of head, or extending al)ove it in branch /// (coincident with 

 the loss of the jjectination of antennae); but at ^^'- they are shortened 

 again, not reaching vertex of head and porrect. Branch B retains the 

 primitive short i)a]pi, except at I, where there is a slight lengthening 

 with upturning, but not so as to approach vertex of head. 



2. Vein 6 of hind wings arose from the cross vein of cell, sepa- 

 rate from vein 8. At branch B vein 6 becomes coincident with 7 at 

 origin or stalked with it; also at branch /'. Branch c retains the 

 primitive character. 



TJic character is gained thrice in phylogeny. 



1. Vein 7 of the fore wings arose from the cell, remote from the 

 stalk of 8 and 9. It has become united with this stalk, either arising 

 from its base or at a varying distance along the stalk in branches C, I 

 and J. Branches h and c retain the primitive character. 



2. The hind tibije* had two pairs of spurs, at the middle and end 

 of the tibire respectively. The middle pair of these has been lost at 

 branches I, J and g. 



The character is gained six tin/es in phyh^geny. 

 A^ein 10 of fore wings arose from the cell, before the origin of 

 the stalk of veins 8 and 9. It has become coincident with this stalk 

 for varying distances at branches Q, M-N, I, C, /; and f. This char- 

 acter seems too flexible to be of use in generic definition. 



SYNOrSIS OF GENERA. 

 Male antennse pectinate at least in part. 



I'alpi, long, upturned nearly to vertex Isochaetes.f 



* Not including IsocJicctes, which adds another exception in both palpi and tibial 

 .spurs. 



-j- This genus was unknown to me when this article was prepared and has been 

 inserted in the proof. The larva belongs definitely to the Pliobetron group (Tropic 

 hairy Eucleids), yet the imago contradicts the character that I had selected as defining 



