237 
by a faint white shade line not reaching above vein 5; a black dotted terminal 
line; fringes smoky. Secondaries paler smoky with sprinkling of white scales 
outwardly, traces only of a dark subterminal line and dark dotted terminal line; 
fringes as on primaries. Beneath silvery gray with slight dot on costa marking 
inception of t. p. line and dark dotted terminal line. Expanse 19 mm. 
Hasirat. Silverton, Colo. (Aug. 1-7). (McDunnough). 1 9. Type, 
Coll. Barnes. 
Resembles in general marking Titanio alticolalis B. & McD., but 
differs in structure and in the pale underside. 
Maroa Gen. nov. (Type Maroa unicoloralis). 
Antennae of ¢ ciliate; labial palpi porrect, 3rd joint concealed, smoothly 
scaled; maxillary palpi filiform; front with corneous process consisting of a 
central conical tubercle and a short lateral truncate process in front of each eye; 
legs smoothly scaled; upper outside spur of posterior tibiae about half the 
length of inner spur, lower spurs short; vein 7 of primaries straight and well 
separated from 8 and 9. 
M. uNIcoLorALIs sp. nov. (Pl. I, Fig. 15). 
Head, thorax, abdomen and wings pale creamy-white without maculation, 
beneath as above. Expanse 23 mm. 
Hasitat. Phoenix, Ariz. (June 1-7); Arizona (June 1-7). 1 6,4 Q. 
Types, Coll. Barnes. 
The species has possibly been confused with succandidalis Hst. 
which has however an entirely different frontal structure and which 
seems confined to the Rocky Mountain region. 
MIcROCAUSTA BIPUNCTALIS sp. nov. (Pl. I, Fig. 16). 
Primaries brown; t. a. line black-brown, angled outwards below costa, then 
slightly inwardly oblique and minutely waved to inner margin; reniform con- 
sisting of two small superimposed orange-yellow spots; t. p. line commencing at 
a point on costa above reniform, strongly outcurved to a point half way be- 
tween reniform and outer margin, then parallel to same with slight incurve 
above vein 1; costa at apex of wing finely orange-yellow, bordered inwardly 
by a white line; basal half of fringes deep smoky, outer half white, cut at apex 
by a smoky streak; line of demarcation slightly undulate. Secondaries with 
outer margin excised above vein 4; deep smoky brown with paler fringes. Be- 
neath pale smoky, secondaries with traces of a subterminal line; fringes as 
above. Expanse 10 mm. 
Hasitat. Redington, Ariz.; Palmerlee, Ariz.; Santa Catalina Mts., Ariz.; 
S. Arizona (Polling). 9 6,3 9. Types, Coll. Barnes. 
The ’s are slightly deeper in color than the ¢’s especially on 
secondaries. 
