A KEVTSION OF THE DELTOID MOTIIS SMITH. 9 



throughout this tribe aiiteinial (leveloi)iiKMits and li'i; stiuetuie.s sliould 

 be clost^ly conehited; for with the most liberally tutted legs are asso- 

 eiated tlu^ antenna' with the longest pectinations or )>ristles and the 

 most higlily developed ap[)rcciative organs. 



Ihe genera in this tribe are quite numerous, and (ii\ ide rea<lil.\- into 

 two series, in one(»fwhi(di the palpi are slender, closely scaled, npcurved, 

 and often recurved, tlu^ second Joint never straight or with upright 

 vestiture forming a blade-like structure. In the otiier the palpi are 

 straight or oblicjue, never recurved, tlu; second joint always with 

 u])right scales, foi-ming a coni])ress('d more or less blade like structure; 

 the latter series in tliis ]>articular agrees with lli/itciui, while the former 

 agrees with Helia. 



Among the genera with slender palpi ZaudogiKdha and llormlsa have 

 at the basal third of the male antenna' two or three joints furnished 

 with stout corneous processes and an outer thickening of scales. Zan 

 chf/naflia has the male antenna' with long lateral bristles, while m 

 Horniisa there are long pectinations. These genera are well associated 

 and are conveniently placed at the head of the series, in both, the 

 tuftings of the forelegs of the male are well developed, reaching their 

 extreme in some species of 7ior»r/.vo. 



Tctdnolitd lias the male antenme laterally bristled, and at basal third 

 there IS a pointed tuft of hair, very similar to that of Rcnia, but it does 

 not cover any special moditication except a slightly eidarged loint or 

 two. The tuftings of the male tore legs are moderately well developed. 

 This genus, containing small species, sliows marked relationship to 

 Blcptina and Renin, and its natural position is between these genera 

 and not immediately following Jlormisdy where convenience of analysis 

 has placed it. 



Biepfina has the antennae laterally bristled in the male, without special 

 moditication of any kind at basal third. The tufting of the male 

 fore legs is much reduced. TTnlike all the other genera with which it 

 is associated it has narrow, elongate, and pointed wings. The palpi 

 are transversely tlattened, but are curved and do not have prominent 

 upright scales. It forms a connecting link to the second series, and is 

 allied to Rrnin. 



In the series in which the palpi are straight or oblique and blade like, 

 with upright scales, some diffei«»nces in venation and wing form occur. 



The accessory cell is present, and the venation is (piite normal in 

 Pltihnxrfid, CJn/folifa. llypeiuiUi, and Dercetis. It is absent and the vena- 

 tion is abnormal m Ji'eiini, Heterogrdinmii, Gabcrasa, nud Palthia. 



VhHomctra lias lengthily bipectinated male antenna', without special 

 modification or nodosity at basal third. The tuftings on the fore legs 

 are very strongly marked, resembling 7yor/»/.sr/ in these(diaiacters. as in 

 the antenna'. Its natural i»osilion is immediately alter llormisa, from 

 which it differs in palpal structure as well as in the lack ot sjiecial 

 antennal modification. 



