A REVISION OF THE DELTOID MOTHS SMITH. 83 



reaching tlie tip of the cloiiuated first tarsal joint, and not coverinj,^ 

 any brush or pencnl of hair or s[)e('ialize<l scal«'s. The wings are char- 

 acteristic; the primaries are broadly trigonate, the ai)ex acute, the 

 outer margin distinctly anguhited at the middle, excavated between 

 that joint and tlie apex and markedly obli(|ue toward tlu; liind angle. 

 The secondaries have the outer margin somewhat retracted opposite 

 the cell. The venation is probably somewhat variable on the primaries. 

 As described by JNIr. Grote no accessory cell is present, and so it seems 

 on one si)ecimen examined without denuding. On a bleached wing- 

 before me the accessory (;ell is ])reseiit, though narrow, and vein 10 

 arises from this; the venation is quite normal in fact. It is probable 

 that the cell may be frequently absent or so reduced as to ai)pear so, 

 and in such cases 8 and 10 will seem to or actually arise from the 

 subcostal. On the secondaries in the specimen under examination 

 veins 3 and 4 are on a stalk beyond the end of the cell, while ~^ is out 

 of the median by a short curved branch or loop. 



This genus is a well-marked one and (piite characteristic. The angu- 

 lated wings it shares with Falthis, but they are wider and compara- 

 tively shorter. The palpi oHer nothing unusual. The fore tibia* of the 

 male show the characters of the llerminia. but in a very reduced form, 

 and no brushes or tufts of hair or scales are present. The antennae in 

 the male are remarkably coarse, with rough vestiture, long joints, and 

 heavy pectinations. 



Two species are described, both of them small and light purplish 

 gray in ground color. 



Vitrea is the larger, somewhat broader winged, with a reddish or 

 brown suftusion and a white reniform. The pectinations of the male 

 antennjv are long and stout, about twice the length of the joints, 

 laterally ciliated, and with long, slender bristles near tip. 



Fi/t/mmi is decidedly smaller, darker, more purplish gray in color, 

 the reniform yellow, with a central dark lunule. The ijectinations of 

 the male antennre are hardly longer than the joints, irregularly set 

 with rather long, tine hair and Avith a very long, moderately stout 

 bristle at their base, arising out of an enlargement of the joint itself 

 rather than of the pectination. 



The species are not common and rarely rei)resented in collections; 

 perhaps because they have been considered as micros. 



Deicetis vitrea, (Jrote. 



1878. Grote, Bull. U. S. Geol. Surv., IV, 187, Dcrcelin. 



Ground color light purplish gray, Avith a faint reddish suiTusion. 

 Head, thorax, and abdomen paler, nearly white. Primaries with a 

 reddish suftusion over the costal region, becoming more prominent and 

 ditfuse to the transverse posterior line, beyond which it does not 

 extend. Transverse anterior line slender, brown, irregular in course, 

 and variably outcurved in the intersi^aces. Transverse posterior line 



