Negasilus belli Curran, 1934

Lavigne, Robert J. & Dennis, Steve, 2019, Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species, Zootaxa 4662 (1), pp. 1-126 : 51

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).