258 U.S. NATIONAL MUSEUM BULLETIN 2 77 



173. Pseudatrichia morlani, new species 



Figure 167 



Male. — Head, red-brown; eyes red-brown above, black-brown 

 below; a narrow postocular flange behind eyes; frons narrow, shining, 

 but continuing uninterrupted to the median ocellus; ocellar triangle 

 prominent, ocelli clear. Antennae red-brown, last segment with 

 short hairs, which give a golden glint, cupped at tip. 



Thorax dorsum black, metallic, transversely striated, humeral and 

 supra-alar calli orange-brown; scutellum red-brown; pleural areas 

 red-brown. Wings clear, veins brown; halter stem brown, knob white. 

 Forelegs yellow-brown with brown tarsi; middle legs, femora orange- 

 brown, tibiae red-brown basally, orange distally, tarsi brown; hind 

 legs with femora orange-brown basally, red-brown distally, tibiae 

 red-brown, tarsi, first segment orange, remainder brown. 



Abdomen segments 2-4 black, rugose, with a purple metallic glint; 

 segments 5-7 shining, ninth tergum red-brown, generally withdrawn 

 into the seventh segment, posterior margin toothed dorsally and 

 concave on ventral half; spines of ninth sternum sparse and coarse. 

 Aedeagus bilobed with two median peni spurs. See figure for details. 



Female. — Head black, eyes black-brown; postocular flange smooth 

 and shining; frons red-brown, as wide as ocellar tubercle, with stri- 

 ations from the edge of the eye laterad of the antennae to the median 

 ocellus, a few white hairs set in these striations; frons swollen above 

 the antennae; ocellar tubercle flat, set off, ocelli clear; mouthparts 

 w^ell developed, red-brown, filling three-fourths of the oral cavity; 

 palpi red-brown, half the length of oral cavity. Antennae red-brown, 

 third segment clothed in short hairs with a golden glint; see figure 

 for details. 



Thorax as in male. 



Abdomen black, metallic. Eighth segment red-brown, sternum 

 truncated; see figure for details. 



This species is close to Pseudatrichia unicolor, but differs in many 

 ways. 



Length: Male body 4.5-4.7 mm., wing 2.6-2.8 mm.; female body 

 4.2-4.8 mm., wing 3-3.2 mm. 



Type-locality: Santa Fe Co., New Mexico; 13 January 1953 

 (H. B. Morlan) from Neotoma albigula nest. 



Holotype: Male (USNM) 67468. 



Allotype: Female, Santa Fe, New Mexico; 12 July 1952 (H. B. 

 Morlan) from Neotoma albigula nest, (USNM). 



Paratypes: Icf, Santa Fe, July (Cockerell 1377); Icf, Pecos, New 

 Mexico, 17 June (Cockerell) at light; 3 0^0^, 6 99, 12 August, 18 

 November 1952, 13 and 17 January 1953, plus 7 pupal skins all with 

 same data as type and allotype, ah (USNM). 



