170 WILLIAM J. FOX. 



trochanters beneath, their femora anteriorly and posteriorly, medial and hind 

 tibise except internally, first joint of tarsi, a sinuous spot on each side of first 

 abdominal segment, broader spots on second, long slender marks on segments 3-6, 

 those on segments 4, or 5 and 6 generally touching within, thus forming a band, 

 and small latei'al spots on second ventral, yellow ; thorax not at all marked with 

 yellow; mesosteriium with a rather long, pale pubescence. Length 8 10 mm. 



Nova 8c()tia (vSiuith ) ; Canada ( Harrington ) ; Montana ; Colorado ; 

 Arizona ; Oregon ; Washington. Notwithfstanding the differences 

 pointed out by Packard between latipes and coloradensis I feel obliged 

 to unite the two. I have the types of coloradeitxl.-< before lue and 

 fail to discover the differences indicated by that author. It is true 

 that the abdomen in his type specimens is longer than in others, but 

 a large series, twenty-four specimens, shows the intergradational 

 forms to the specimens with the shorter, more ovate abdomen. 



47. C'rabro \icinus Cress. 



Crabro vicinus Cresson, 1. c. p. 479, 9- 



Crahro suecinctas Cressou (in pt.), ibid. p. 479, ? . 



Thyreopus advenus Packard (in pt.), 1. c, p. 368. 



Thyreopus succinetus Packard, ibid. p. 369. 



Crabro vicimis Cresson, Synopsis, p. 285. 

 9 . — Head finely and closely punctured ; space between hind ocelli l)ut slightly 

 less than that between them and the nearest eye-margin ; anterior margin of 

 clypeus sinuated, but not strongly, not or scarcely dentate laterally ; pronotum 

 feebly furrowed at the sides, not ridged anteriorly, and not at all dentate laterally ; 

 dorsulum with rather strong, well-separated punctures, particularly on posterior 

 portion ; punctures of mesopleurse not stronger than those of the dorsulum but 

 much sparser, the episternal suture with tolerably strong fovese ; middle segment 

 above with a rather fine striation, curving toward the sides and basally some- 

 times with a few short, stronger strise or ridges, posterior face roughened, coria- 

 ceous, the lateral ridges becoming obsolete above the middle, sides with a fine, 

 rather indistinct, striation. Black; mandibles except apex and extreme base, 

 clypeus more or less, generally entirely except fore margin, scape, sometimes 

 spotted behind with black, spots on pronotum sometimes almost connected within 

 and again being absent, tubercles entirely or in part, scutellum more or less (some- 

 times black), tips of femora, til)ia? except a dark spot within, first joint of tarsi, 

 two sinuous spots on first abdominal segment in some cases connecting internally 

 and thus forming a band, broader spots on segments 2. 3 and 4, those on the latter 

 segment generally forming a band, and irregular sjiots on ventrals 2 and 3, which 

 may be absent in part or entirely, yellow ; wings with a yellowish tinge, the ner- 

 vures and stigma of that color ; pubescence of head and thorax pale gray. Length 

 8-11 mm. 



Colorado; Nebraska (Barber); Nevada; Arizona; California; 

 Mt. Hood, Oregon ; Washington ; Montana. A specimen labeled 

 Canada has the markings greenish white. This is a variable species, 

 but is easily distinguished by the form of pronotum, fine sculpture 

 of upper surface of middle segment and sculpture of dorsulum. It 

 will probably be placed as the 9 of latipes eventually. 



