Negasilus belli Curran

Negasilus belli Curran, 1934: 184 .

Recognition characters: Brown gray species; length 8–9 mm; mystax white; thorax gray and brown pollinose; scutellum gray pollinose; scutellar setae and bristles lacking; wings with brownish aspect; abdomen gray pollinose; legs, femora black except for reddish band at apex; tibiae reddish brown with black anteriorly; first tarsal segment brown with rest black.

Distribution: ALBANY: Laramie, 29 July 1934 (RO & VDC - UMI); 13 July1937 (CLJ-UK); 9 July 1956; 64 km NE of Laramie, 13 July1937 (RHB-Martin coll.); Tie Siding, 26 June 1940 (MT & HBJ - SCU); Univ. of Wyoming Agronomy Farm, Laramie, 9 July 1956. LARAMIE: Pine Bluffs, 6 July 1966; 22 June–5 July 1967 (RJL). NIOBRARA: Lusk, 14 July 1937 (RHB, CLJ-UK). PLATTE: Camp Guernsey, WANG, 2001b (CSU, GMAD). SWEETWATER: 366 River Mile Green River, 6 July 1959 (BCH) (specimen in UU, ECNHMU); UINTA: Evanston, 15 July 19 - (RFK-USU); Lonetree, 17 July 1961 (GFK) (specimen in CAS). Recorded from Wyoming by: Adisoemarto (1967) (Laramie); Geller-Grimm (2018); Martin (1975).

Habitat: Pine-douglas fir forest (clearings within the forest where shrubs and grasses are dominant), sagebrush steppe shrub and grassland, and grama-needlegrass-wheatgrass and grama-buffalo grass grassland vegetation types. Collected in field of reed grass ( Calamagrostis sp.), bordering a small stream (deer fly habitat).

Ethology: Limited information (see Lavigne et al. 1968).

Prey: DIPTERA (see Lavigne et al. 1968).