28 lUTLLETIN 48, UNITED STATER NATIONAL MUSEUM. 



from base there is a thickeniiijj;' of the stem, principally caused by a 

 dense clothing- of scales outwardly, marking a moi'c or less evident 

 bend, and beyond this are two or three joints, each of which has also 

 a stont, claw-like process on the inner side. Two is the usual number, 

 and three the exception. In the female tiie antenmt' are simple or 

 scaled, or with small lateral bristles, and as no two species ;ire (juite 

 alike in this particular this feature will be separately described for 

 e.ach. The i>alpi are very long, curving upward, far exceeding the 

 vertex, the second joint much the longest, the vestituie quite closely 

 appressed or even smoothly scaled, never with upright or blade like 

 upper edge; quite markedly sickle-shaped. Ocelli distinct, close to the 

 compound eye, and quite well removed fiom the base of the antenn.e. 

 The body is slight compared to the wings, the thorax proportionately 

 sniidl, untuftcd, the abdomen cylindrical, subeijual, untufted, reiicliing 

 to or exceeding the anal angle of secondaries. Legs long, slender, 

 closely scaled, the posterior much the longest and in these the tibia' 

 are stouter than elsewhere. There is no armature save the usual spurs 

 of.the middle and hind tibi;v, and these are very long and somewhat 

 une((ual, the inner spurs considerably the best developed. 



In the males the fore legs are considerably modified and curiousiy 

 tufted, coxa, femur and tibia becoming greatly changed to accommo 

 date these abnormal appendages. As they vary in the species and 

 have been already generally characterized they will be separately 

 described under the specific headings. 



Tlie wings are large, the primaries trigonate, with rectangular or 

 obtuse apices and very evenly and not greatly curved outer margins, 

 the inner margin not much shorter than the costa. The venation is 

 normal; but varies somewhat in the arrangement of the veins arising 

 from, the access(uy cell; 10 being sometimes from the middle of the 

 upper margin, sometimes from the end, and sometimes even from a 

 stalk Avith 8, a short distance beyond it. 



Under the above definition are included the species of Pityollta. 

 CJepio)nitaj and Mef/achi/ta^ as well as those usually referred to Zanchuj- 

 natlia, be(;ause I have found it impossihle to find valid characters for 

 their separation. Mr. (irote never attempted to distinguish the genera 

 except in the most indefinite way, scarcely doing more than to designate 

 the type, and the ditt'erence in superficial api)earance has kept them 

 apart since. 



In the si)ecies referred to Megachijta, the median lines are tliicl<ened 

 at their incei)tion on the costa, forming more or less idomiiient spots, 

 and this gives the species a characteristic appearance, which almost 

 entirely vanishes in Z. inconspicnaHs. There is also a seeming ditter- 

 ence in w ing form, which proves elusive on careful examination, and 

 leaves me without a reasonable basis for the genus. 



Clepiomita has nothing at all to support it save its distinctive macu- 

 latiou, and e\en this is close in t.v])e to that of Z. hvi'ijata. The type 



