NORTH AMERICAN HYMENOPTERA. 



171 



11. Group tenniglosms. 

 Tlie males of this group (lifter from those of group largior by the 

 simple, non-dilated antenna-, and by the first joint of fore tarsi being 

 without an appendage ; otherwise they are the same. The females 

 are indistinguishable from those of the preceding group. 



48. €rabro coiispicuus Cress. 



Crabro conxjncniis Cressou, Proc. Ent, Soc. Phila., iv, p. 480, 9. 



Thyreopnn conspicuus Packard, 1. c, p. 369. 



Crabro conHpicuns Kohl, 1. c, p. 585. 

 9 .—Head finely and closely punctured, but less so tlian advenus ; space between 

 hind ocelli less than that between thena and the nearest «ye-margin ; anterior 

 margin of clypeus broadly truncate, armed with a distinct, blunt tooth on each 

 side; pronotum strongly furrowed on each side, the frontal ridges strong, ijut 

 short, the lateral tooth not well developed ; dorsuhnn a little less closely punc- 

 tured than in advenus; mesopleurje with large and sparse punctures, stronger 

 than in the species mentioned above, the episternal suture less strongly foveolate ; 

 middle segment as in advenus, but the furrow of upper face not so strong, and the 

 sides more feel)ly striated, sometimes smooth and glabrous medially. Black; 

 mandibles on basal two-thirds, scape, clypeus, two large spots on pronotum, tuber- 

 cles, scutellum (black in one case) tips of femora, fore pair beneath and sometimes 

 medial pair, tibia?, except a line within, first joint of tarsi, a broad band on first 

 dorsal abdominal segment, two broad spots on second, which are broadly truncate 

 within narrower spots on segments 3 and 4, these spots pointed internally and 

 emarginate anteriorly, a band on segment 5 and an irregular spot on each side 

 of ventral segment 2, yellow ; wings subhyaline, darker apically, all the nervures 

 and stigma dark; silvery pubescence in the usual places, but rather sparse. 

 Length 10 mm. 



Colorado; Washington. The shape of markings of abdomen 

 seems to be a good superficial character for distinguishing this from 

 advenus. 



49. Crabro a«lvenus Sm. 



Crabro pegasus Harris, Catal. Ins. Mass.. p. 68 (no descr.). 



Crabro advenus Smith, 1. c. p. 421, ? (non % ). 



Crabro succinctus Cresson (in pt.), Proc. Ent. Soc. Phila., iv, p. 479, 9 . 



Thyreopns pegasus Packard, 1. c, p. 362, % 9 . 



Thyreopus advenus Packard (in pt.), ibid. p. 368. 



Thyreopus. succinctus Packard, ibid. p. 369. 



Crabro advenus Kohl, 1. c, p. 584. 



Crabro pegasus Kohl, ibid. p. 585. 



Crabro succinctus Kohl, ibid. p. 585. 

 9 .—Head finely and closely punctured ; space between hind ocelli about equal 

 to or slightly greater than the space between them and the nearest eye-margin ; 

 anterior margin of clypeus broadly truncate, not dentate, the lateral angles ob- 

 tuse ; pronotum strongly furrowed on each side the frontal ridges well developed, 

 the lateral tooth strong ; dorsulum with tolerably fine and close, even punctures, 

 those on scutellum sparser; mesopleurte with rather large and sparse punctures, 



TRANS. AM. ENT. SOC. XXII. JUNE, 1895. 



