180 U. S. NATIONAL MUSEUM BULLETIN 216 parts 



found in Pratt's revision. Cases where our determinations are known 

 to disagree with his are as follows: 



Albitarsis albitarsis of 'Prsitt=albitarsis albitarsis plus a small 

 percent of what we assign to albitarsis argentifrons. 



Associatus of I'rsiit= persimilis (females) plus ruralis (males). 



Dims of Frsiti= dims plus relativus nitschei. 



Inornatus of VY2iti= albitarsis argentifrovs plus latigenalis. 



Mutatus of Vviiii= albitarsis mutatus plus mentigus rhodomems. 



Pacificus of Fra,it—pacijlcus plus relativus punicus and tejonensis 

 tejonensis. 



Tejonensis of Vnitt=^tejonensis tejonensis plus Vancouver ensis. 



Temporalis of 'Prsitt=tejonensis mimicus plus relativus nitschei. 



Key to the Nearctic species groups and species of Trachysphyrus 



(Males of atritihialis, crassulus, areolatus, and krombeini are not available.) 



1. Axillus vein (the short vein near anal margin of hind wing) diverging from 



inner hind margin of hind wing 2 



Axillus vein parallel or convergent to inner hind margin of hind wing . . 23 



2. Temple strongly rugulose or rugulose-punctate; abdomen black with a 



weak, dark blue iridescence; hairs on head, body, and coxae long, sparse, 



and suberect. Cyanator group (p. 185) 3 



Temple smooth, with distinctly separated punctures; abdomen fulvous or 

 ferruginous to black, without a bluish iridescence; hairs on head, body, 

 and coxae varying from short to long. Recreator group (p. 187). . . 4 



3. Hind basitarsus fulvous or a little infuscate; wings faintly to distinctly 



infuscate; teeth on ovipositor tip projecting a little below lower edge of 

 ovipositor so that they are conspicuous in profile (fig. 328,f). 



1. miirorum (Tschek) 

 Hind basitarsus fuscous; wings moderately infuscate; teeth on ovipositor 

 tip not projecting below lower edge of ovipositor (fig. 328,g). 



2. genatus (Pratt) 



4. Males 5 



Females 14 



5. Mesoscutum fulvous 6 



Mesoscutum black 7 



6. Front wing yellowish, with two transverse brown bands (fig. 339). 



4. fasciatus, new species 

 Front wing uniformly fuscous 9. serraticaudus (Pratt) 



7. Under side of hind femur with a weak, subapical longitudinal ridge; hairs 



on head brown, very long and suberect, those on temple a little longer 



than basal diameter of flagellum 10. calescens (Gravenhorst) 



Under side of hind femur without a longitudinal ridge; hairs on head whitish 

 to dark brown, short to moderately long 8 



8. Hairs on head and thorax dark brown; wings infuscate; segment 3 of hind 



tarsus usually black 5. dirus (Cresson) 



Hairs on head and thorax whitish to pale brown, sometimes darker around 

 mouth; wings hyaline to moderately infuscate; segment 3 of hind tarsus 

 white or yellow 9 



