250 ENTOMOLOGICAL NEWS. [June, 'o8 



segment 3, 4 and 5 deep yellow; tegulse part yellow and part testa- 

 ceous ; wings hyaline, the apical margin slightly dusky ; nervures, 

 costa and stigma pale brown to testaceous ; clypeus, lower inner orbits, 

 lower part of cheeks, fore femora above thorax (more strongly so 

 on pectus and posterior face of metathorax), sides of three apical 

 abdominal segments with silvery pubescence. 



Habitat Florissant, Colorado, July 6, 1906 (S. A. Rohwer). 



The following table will separate this species from all its 

 allies. It is more closely related to rufifemur Pack., but quite 

 distinct. The table is based on the females of the subgenus 

 Protothyrepus (Fox's group rufifemur). 



Head and thorax with long, dense hair ; ventral segments of abdomen 



2-5 spotted with yellow (Calif. ) villosus Fox. 



Head and thorax without such hair ; venter of abdomen immaculate. . i. 



1. Posterior face of metathorax with two yellow spots (Atlantic coast 



generally bigemimis Patt. 



Posterior face of metathorax immaculate, black 2. 



2. Pygidium strongly margined by a wall, slightly but distinctly depressed 



apically ; head not larger than usual (Colorado, S. Dakota, 



Montana, Washington) dilectus Cress. 



Pygidium not thus margined and not depressed apically ; head 

 large 3. 



3. Mesopleurae striato-punctate throughout ; enclosure of metathorax 



striato-punctate, posterior face distinctly transversely striate ; 

 punctures of scutellum sparse ; punctures of first abdominal 

 segment large and distinctly separated ; second ventral seg- 

 ment with large well-scattered punctures ; no yellow beneath 

 tegulae ; two elongate yellow spots on third abdominal seg- 

 ment ; legs partly rufous ; fore femora without or with very 

 little white pubescence above (U. S. east of Rocky Mts. , and 

 north of a line from Nebraska to Maryland . . rufifemur Pack. 

 Mesopleurae distinctly striate above ; enclosure of metathorax finely 

 obliquely striated ; posterior face very finely transversely stri- 

 ate ; punctures of scutellum dense ; punctures of first abdomi- 

 nal segment finer and denser ; second ventral segment without 

 large punctures ; a large yellow spot below tegulas ; third 

 abdominal segment with a broad band ; femora without rufous ; 

 fore femora above with white pubescence (Colo.). 



megacephalus Roh. 

 Crabro (Solemn s Lept. ?) ferrugineipes n. sp. 



$ . Length 10 mm. ; length of anterior wing 8 mm. Head not as 

 wide as thorax, closely, finely punctured (punctures densest between 

 the eyes ; ocelli in a low triangle ; each ocellus in a depression ; dis- 

 tance between the two lateral ocelli distinctly less than the distance 



