Pomona College Journal of Entomology 771 



Wings 



Held horizontally in rest. Veius Never held horizontally. Cos?tal 

 pale. (Thomas.) dark, first, second and base of third 



diseoidals dark and narrowly clouded. 



Stigma blunt at apex. (Thomas.) Stigma acute at apex. 



Legs 



All whitish except last joint of the Coxa- and all but apex of femora 



tarsi of winged individuals. (Will- yellow, tibia and tar.si dark through- 

 iams.) out. 



Named after the species of the Host Plant Juglans calif ornica Wats. 



Tribe LACHNINI 



Body — Usually large, hairy, flattened, widest just in front of the cornicles. 



Antennae — Short, scarcely longer than half the length of the body, not 

 on frontal tubercles; six articled except Essigella, which has but five; rather 

 slender ; hairy ; article III longest, usually as long as TV and V together. 



Legs — First and second pairs rather short; third pair exceptionally long; 

 stout; hairy. 



Wing Venation — Primary wings with costal, subcostal, stigmal, and three 

 diseoidals, the third being twice forked. The first and second diseoidals with 

 bases often very close together. Third discoidal sometimes very faint. Stigma 

 usually long and slender. Stigmal vein nearly always straight, but may be 

 slightly curved. Secondary wing with subcostal and two diseoidals. 



Cornicles — Very short; conical; ring or pore-like or entirely obscure or 

 ■wanting ; base usually as wide as the length. 



Style — Rounded ; inconspicuous ; or obsolete. 



Of all the tribes in this family, perhaps there are none more difficult or 

 obscure than the one under consideration. Wilson, in the Annals of the En- 

 tomological Society of America, Vol. TV. ])]). 51 -.')4, has made the first advance 

 in bringing the various g(>nera and their synonyms together. losing this as a 

 basis, I have attempted to fonnulate, though in a very rude way, a key to 

 these known genera. This has been especially difficult, because of the fact that 

 most of the types as well as the genera and many of the known species have 

 been described in Europe and have received little or no attention from Ameri- 

 can writers. It has been necessary to select characters as they are given in the 

 original descriptions, and many of these are not fit material for formulating a 

 key. 'Sly chief aim in so doing is to get the key before the public and asking 

 all to join in its revision and correction. It is to be understood then that the 

 following is but provisional : 



Provisional Key to Genera 



1. Antenna' with five articles. 8 



Antenna; with six articles. 2 



