4 BULLETIN 48, UNITED STATES NATIONAL MUSEUM. 



actCTs ot" the Tritidn'. The palpi also agree with the series of which 

 Amolita, CUU(, and E itva I i/ptcr a iovm a part, and there its relatives must 

 be sought. Finally the early stages are aberrant. The larva, accord- 

 ing to Guente, lives on low plants in moist localities; has sixteen feet, 

 resembles those of Pterophora in appearance, has a large, tiattened 

 head, is sluggish and when transforming into a pupa fastens itself by 

 the crem aster as well as a girth in a horizontal position. This pupa 

 has au obtuse head case with two distant tubercles, above each of 

 which are two diverging bristles. None of these characteristics are 

 Deltoid, and for the reasons given [ do not include the genus here. It 

 maybe stated that Herrich-Schaett'er classed it with his Nycteolidtie, 

 which may not have been such a huge blunder as has been thought. 



1 have mentioned two tribes in the previous pages, the Hermiuiini 

 and the llypenini; but there is really another which contains in our 

 fauna a single genus only — the Heliini, all reterable to the genus 

 Epizenxi;-!. 



The Heliini are characterized by smoothly clothed palpi, curved 

 upward close to the front, reaching to or considerably exceeding the 

 vertex. The antenuic in the male are laterally ciliated, without si)ecial 

 moditication or nodosity, and the fore legs in the male are peculiar in 

 that the fenjur is unusually long, dilated at base, and excavated inte- 

 riorly toward the apex to-receive the tibia, which is short and without 

 special moditication. The wings are of good size, subparailel or with 

 a slightly obliipie outer margin, so that the costal and inner margin are 

 of nearly equal length. I have not been able to make out any special- 

 ized sensory structures in the femoral excavation. This tribe is the 

 least specialized of the Deltoid group. 



The Hermiuiini offer more decided characters, chielly in the male, in 

 palpi, antenuic, feet, and wing lorm. The pali)i may be slender, 

 smoothly scaled, recurved; or they may be compressed, with upright 

 vestiture, and then either oblique or straight, the middle joint always 

 longest, and the uinight vestiture either massed toward the ti]) or even 

 throughout. In the male tlie palpi are frequently shorter, and are 

 obli(iue when they are straight in the female. In one case only, Falthis, 

 we have at the tip of the third Joiui; a membraneous extension, forming 

 a.cover in which lies a pencil of long, yellow, hair-like scales, which is 

 capable of expansion at the will of the insect, A more particular 

 description of these pencils is given later on, but they are in all essen- 

 tial features like those on the fore legs of other genera, and there are 

 the same large sensory pits that are found elsewhere in association 

 with these tuftings or pencils. 



The auteuiue in the Hermiuiini are always distinguished in some 

 way in the male. In the tribe as a whole the front of the head is 

 quite wide, and the antennal fove.e are situated well up on the vertex, 

 close to the compound eye, thus well separated at base. In their 

 simplest structure they have the joints with moderate lateral bristles, 



