256 U.S. NATIONAL MUSEUM BULLETIN 2 77 



Male. — Unknown. 



Length: Female body 7.5-8.5 mm., wing 5.8 mm. 



Type-locality: Mexico. 



Type: (ZMH). 



172. Pseudatrichia melanderi, new species 



Figure 166 



Female. — Head black, longer than high; eyes black; postocular 

 flange wide at center; back of head narrower than the bulge of the 

 eyes; frons narrower than the ocellar triangle, with a median groove 

 and oblique striations on lower half; ocellar triangle prominent, set 

 off; ocelli orange. Mouthparts brown, shorter than oral cavity, palpi 

 half as long. Antennae orange; see figure for details. 



Thorax dorsum black, humeral and supra-alar calli red-brown; 

 scutellum red-brown; prothorax light brown, remainder of pleura 

 red-brown. Wings hyaline, veins light brown; halter stem brown, 

 knob white. Legs orange, including coxae; hind legs slightly darker. 



Abdomen segments 2-4 black, punctured, with a metallic purple 

 sheen. Segments 5-7 becoming red-brown. Segment 8 with tergum 

 red-brown, sternum orange, hairy, posterior margin two-pointed, 

 with a slight elevation on the excavated median portion ; see figure for 

 details. 



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

 black below; frons tapering to a point halfway to the median ocellus, 

 separating the eyes; remainder of the distance with a thin raised 

 ridge, lower portion with transverse striations; ocellar tubercle promi- 

 nent, ocelli clear; antennae orange; see figure for details. 



Thorax dorsum black-brown; humeral and supra-alar calli red- 

 brown; scutellum red-brown; pleural areas red-brown. Wing clear, 

 veins brown; halter stem brown, knob white. Legs as in female. 



Abdomen second segment as female, remainder lost. 



Length: Male body ?, wing 4 mm.; female body 5.5-6 mm., 

 wing 3.5-3.7 mm. 



Type-locality: Clear Lake, California; 18 June 1935 (A. L. 

 Melander). 



Holotype: Male (USNM) 67465. 



Allotype: Female Santa Clara Co., California (Harkins Collection) 

 (CAS) 8925. 



Paratype: 1 9, Lucerne, Lake Co., California, 17 August 1958 

 (Hugh B. Leech) on rotting scar wood of Umbellulasia californica 

 (CAS). 



