JAMES A. G. REHN 243 



inflated ventral portion of the genae, when seen in cephaKc aspect, 

 in the more circular basal outline of the eye, in the mesozonal 

 portion of the median carina of the pronotum being weak or 

 siibobsolete, but the lateral portions of the mesozonal bifoveolate 

 elevation not reduced, the pronotum thus more sellate than in 

 plattei, in the median carina on the metazonal portion of the 

 pronotum being weak, and in the lateral lobes of the pronotum 

 being proportionately longer. 



From impexum the present species can be distinguished by the 

 less inflated ventral portion of the genae, seen in cephalic aspect, 

 in the more subequal frontal costa, which is not sharply con- 

 stricted immediately dorsad of the insertion of the antennae, 

 the more produced fastigio-facial angle when seen in profile, the 

 less cristate median carina of the pronotum, the smoother 

 pronotal surface, the more slender and elongate form and duller 

 normally exposed coloration. 



The beautiful rose-red disk of the wings appears to be a 

 specific character, as we have seen none with yellow disks. 



Type. — cf ; Pecos, Reeves County, Texas. Elevation, 2596 

 feet. September 18, 1912. (Rehn and Hebard.) [Hebard 

 Collection, Type no. 496.] 



Description of Type. — Size rather small; form slender, elongate, subeom- 

 pressed dor-sad: surface finely rugulose and dull, particularly in depressed 

 areas, smoother in elevated sections, the dull areas with sparse, very short hairs. 



Head less inflated than in the related species: occiput, vertex and fastigium 

 in profile regularly arcuate; fastigio-facial angle well marked, narrowly rounded, 

 obtuse, situated between the antennal bases; facial line moderately retreating: 

 fastigium slightly broader than long, broadly open caudad; lateral margins 

 distinct, parallel caudad, concavely convergent cephalad, the cephalic width of 

 the fastigium less than one-half its greatest width, there closed by a V-shaped 

 carina, as described in D. impexum but less evident; surface of fastigium shal- 

 lowly excavate: frontal costa of medium width, very faintly and broadly 

 narrowed dorsad, gently and broadly expanding between the antennal bases to 

 slightly more than the width of proximal antennal joint, very faintly and 

 broadly narrowed ventrad of this, then regularly, though moderately and in a 

 sub-obsolete fashion, expanding to the clypeal suture; surface of frontal costa 

 as a whole considerablj' sulcate, weakly foveolate dorsad in contact with fasti- 

 gial V-carina, sulcation becoming obsolete ventrad; carinal margins as a whole 

 sharp; lateral facial carinae arcuate about antennal bases, thence rather 

 strongly divergent to the clypeal angles. Eyes large, prominent, in cephalic 

 aspect they are seen to be very faintly elevated dorsad of the vertex, the 

 width across the eyes slighth^ greater than that across genae; in lateral outline 

 the eyes are broad subreniform-ovate, their l)asal outline less in area than their 



TRANS. AM. ENT. SOC, XLV. 



