22 U.S. NATIONAL MUSEUM BULLETIN 277 



4. Scenopinus breviterminus, new species 



Figure 5 



Male. — A large robust fly similar to S. fenestralis except for head 

 and genital structures. 



Head black-brown; eyes red-brown, darker below; frons elongate, 

 separating the eyes above by at least the width of the median ocellus, 

 pitted and with three indistinct shallow grooves on lower frons; 

 oceUar tubercle black, distinct; ocelli clear in specimen. First antennal 

 segment small, brown, shining; second segment orange, larger than 

 the first; third segment red-brown, darker at tip, not twice as long 

 as wide. 



Thorax dorsum black-brown, rugose, thinly covered w4th silvery 

 hairs; humeral callus red-brown, light yellow behind, supra-alar callus 

 red-brown; pleural region red-brown. Wings smoky hyaline, veins 

 brown; halter stem brown, knob red-brown. Legs all segments light 

 red-brown. 



Abdomen red-brown, segments 3-5 banded with white on pos- 

 terior margin. Terminalia red-brown; see figure for details. Internal 

 structure lost through feeding by dermestids. The ninth tergum lobes 

 are shorter than in tj-pical fenestralis. 



Female. — A large black fly resembling fenestralis except for the 

 antennae which are shorter. 



Head black, eyes black; postocular flange flat, dufl. Frons with a 

 median groove from the antennae to median ocellus, slightly swollen 

 above the antennae, granular, except smooth bands along eye margins. 



Thorax black, rugose, subshining, humeral and supra-alar calli orange- 

 brown; halter stem brown, knob oxblood red, polished. Wing hyaline, 

 tinged brownish, veins brown. Foreleg with coxa red-brown, tro- 

 chanter orange, femur red-brown, tibia orange-brown, tarsus straw 

 colored; middle leg with trochanter orange-brown, femur dark red- 

 brown, tibia lighter and tarsus straw colored; hind leg with all seg- 

 ments dark red-brown except tarsus straw colored. 



Abdomen dark red-brown; see figure for details of eighth sternum 

 and bursa. 



Length: Male body 4.5-5.0 mm., wing 3.5 mm.; female body 5.7 

 mm., wing 3.7 mm. 



Type-locahty: Kerr Ranch, New Mexico; 23 April 1910 (J. D. 

 Mitchell), on Yucca. 



Holotype: Male (USNM) 67453. 



Allotype: Female, Carson Pass, California, in fungus (Mont. A. 

 Cazier) (USNM). 



