ICHNEUMON-FLIES — GELINAE : MESOSTENINI 



249 



Cryptus inornatus Pratt, 1945, Amer. Midi. Nat., vol. 34, p. 612; cf, 9- 

 synonymy. Type: 9, Bozeman, 4,800 ft., Mont. (Washington). 



Jew 



Male: Black. Orbit broadly in front, narrow orbital stripes at top of 

 eye and on temple, median spot on face, clypeus, front of scape, mandible, 

 subtegular ridge, under side of front coxa and sometimes of middle 

 coxa, and under side of first trochanter of front and middle legs, white; 

 palpi mostly brown, the second segment of maxillary palpus white in 

 front; tegula entirely white or more or less of its apical part brown; 

 front and middle femora brown to fuscous, most of front femur and 

 apical part of middle femur stramineous or whitish in front; front 

 and middle tibiae brown or fuscous, white above; front and middle 

 tarsi brown, the basal segments often whitish above; hind tarsus with 

 all or most of segments 2-4, and often apex of segment 1, white; seg- 

 ment 5 of hind tarsus brown; wings subhyaline to wealdy infuscate; 

 segment 1 of abdomen black, its apical 0.25 ± red; second and follow- 

 ing abdominal segments red; clasper and subgenital plate fuscous. 



Female: Black. Orbit with a narrow whitish stripe in front and 

 behind; front of front femur brown; tegula, front and middle tibiae 

 and tarsi, and median segments of hind tarsus dark brown to 

 blackish; wings moderately to strongly mfuscate; abdomen red, the 

 basal 0.5 ± of its first segment fuscous. 



This subspecies intergrades with the subspecies albitarsis wherever 

 their ranges are adjacent. In the Canadian zone of the East the 

 intergradation is particularly gradual and the placement of specimens 

 or populations is often arbitrary. For deciding borderline cases we 

 use the characters in the key. The presence of a white spot on the 

 scutellum of the male is rather easy to determine, but the question 

 of how dark the wings of a female must be before it is classified as 

 the subspecies argentifrons is more difficult. The subspecies becomes 

 increasingly darker in coloration in the southern Rocky Mountains 



Figure 130. — Localities for 

 Trachysphyrus albitarsis 

 argentifrons. 



589900—62- 



-IT 



